Images de page
PDF
[ocr errors][merged small][merged small][merged small]

j DESCRIPTION— (Continued)

+18 46 -I

I am unable to identify any of these objects. II 2274 is described as "pB neb
star with two spir branches"; this appears to be three small stars almost
in contact. Most of the others appear to be simply very faint stars. The
region was carefully checked. Examination with the slitless spectroscope
shows no object with bright-line spectrum in this region. 0 s.n.

[ocr errors]
[ocr errors]
[table]
[ocr errors]
[table]

Praesepe cluster. Stars not nebulous with an exposure of 2h, 14 s.n.

Planetary. 1? s.n.

A faint, symmetrical, nearly round spiral 1'3 in diameter; whorls rather open;
the nucleus is faint and almost stellar. 16 s.n.

Described as vF, vS, F st close n. No such object exists in this position. There
is a small spiral (0-type?) at 8h42n>7, +78° 58', with a faint star V n.f.

Slightly oval; exceedingly bright at center. The main portion is about V long;
outside are narrow, very faint spiral whorls; probably 4' in extreme diam-
eter. Curious small "hole" on s. side, close to nucleus. 28 s.n.

Bright, very sparse cluster about 16' in diameter. 5 s.n.

Very bright, rather large nucleus, surrounded by bright nebulosity; farther
out, diameter about 017, is a strong, nearly perfect ring formed by the union
of two whorls; much fainter whorls outside this ring. 30 s.n.

Vol. VIII, Plate 18. A moderately bright, greatly elongated spiral 10' x 1'
in p.a. 40°. Whorls rather patchy; there are strong evidences of absorption
effects on the n. side. See Abs. Eff. 16 s.n.

A rather bright oval VA x 018 in p.a. 95°. Nucleus nearly stellar; a very com-
pact spiral, but spiral structure quite indistinct. 0 s.n.

A fine, slightly oval spiral 2'.\ long; there is a stellar nucleus surrounded by
relatively bright matter; outside this are faint, delicate, nearly merging
spiral whorls. 31 s.n.

A bright patch of nebulosity 015 x 012; nucleus fairly bright, but not stellar.
A very irregular spiral, much condensed.

Exceedingly condensed cluster of faint stars. D. O. Mills Reflector, Santiago,
Chile.

Vol. VIII, Plate 19. A beautiful, very regular spiral, 6' x 116 in p.a. 152°.
Nucleus almost stellar; central portions quite bright; whorls narrow and
compact. See Abs. Eff. 35 s.n.

A bright narrow oval 116 in p.a. 165°; faint nucleus; a compact spiral seen at a
small angle. See Abs. Eff. 15 s.n.

Vol. VIII, Plate 20. A beautiful, bright spiral 12'x 5' in p.a. 18". Large,

confused nuclear portion containing five rather nebulous condensations.

Whorls rather open, showing numerous condensations. Traces of the 0-type

formation. See Abs. Eff. 7 s.n.
A beautiful spiral 2' long; somewhat elongated; nucleus almost stellar; the

two main whorls are somewhat irregular and patchy; moderately bright.
An irregular oval V.2 in length; an irregular dark lane passes down its middle

at one side of the almost stellar nucleus. No spiral structure discernible.

See Abs. Eff. 29 s.n.
Very small, round, bright; almost like a nebulous star; no spiral structure

discernible.
Quite bright oval 312 x 1'1 in p.a. 33°, with clear-cut edges; numerous almost

stellar condensations. Structure quite irregular; probably a rather compact

and very irregular spiral. 1 s.n.
Slightly elongated; 3' long. There is a bright stellar nucleus; the whorls are

quite condensed and rather patchy near the center, fainter and much more

open farther out. 12 s.n.
Rather bright; 6'xl'; faint nucleus. An irregular spiral with very clearly

marked absorption effect on the s. side. See Abs. Eff. 41 s.n.
Vol. Vm, Plate 21; M. 81. This very beautiful spiral is about 16'x 10', and

is too well known to require description. Short exposures show that the

nucleus is almost stellar. Central part very bright. See Abs. Eff. 10 s.n.

[table]
[table]

NGe a s DESCRIPTION— (Continued)

3034 9 47.6 +70 10 A very patchy ami irregular elongated mass, 7'x 115 in p.a. 65°, showing

numerous rifts; an irregular lane divides it approximately along the shorter
axis. It is possibly a very irregular spiral seen edgewise. Exceedingly
bright; the brighter condensations show easily in a 5m exposure. M. 82.
See Abs. Eff. 9 s.n.

Very bright; fading out rapidly toward the edges; round, 0'.3 in diameter,
structureless.

Quite bright; 8'x 1' in p.a. 167°; nucleus elongated and hazy; numerous con-
densations in the whorls. A nearly edgewise spiral, showing evidence of
absorption lane on the east. See Abs. Eff. 34 s.n.

Roughly oval; 3'x2'; nucleus double. The central portion is quite bright;
there are several "holes," of which one near the center is crescent shaped.
Quite patchy and irregular; probably a very irregular spiral, though the
traces of spiral structure are very vague. 3 s.n.

Vol. VIII, Plate 22. An exceedingly bright spindle 4'x 1' in p.a. 45°, with an
almost spherical central portion; no stellar nucleus apparent in short ex-
posures. There are no traces of spiral whorls, but it is doubtless a spiral
of the Andromeda type seen edgewise. 16 s.n.
3148 10 7.4 +51 0 Described as "*7 in photosphere 2' or 3' d". Probably non-existent. Was

unable to distinguish any nebulosity visually, and an exposure of 50m
showed no trace. 16 s.n.

Bright oval 1' long in p.a. 45°; slight traces of spiral character.

A faint, patchy oval V.5 long; probably an irregular spiral.

A nearly round, rather symmetrical and open spiral 3' in diameter; numerous
almost stellar condensations. The nucleus is almost stellar and very bright,
showing well in 10m exposure. There is now no trace of the suspected nova
noted by Mrs. Roberts in A. N., 4708, 197, 1914, 5' 16" west and 1' 58"
north of the nebula. The position given is far outside of the faintest ex-
tensions of this spiral. 2 s.n.
3166 10 8.6 + 3 55 Bright, elongated nucleus, surrounded by bright matter 1' in diameter, show-
ing spiral whorls. Outside this to a diameter of about 4', very faint matter.
31 s.n.

Rather irregular, patchy spiral 4' x V.7 in p.a. 55°. Nuclear portion oval and
quite bright. An absorption lane on the s.e. See Abs. Eff.

A beautiful, very regular, open spiral, nearly round, 6' in diameter. The
nucleus is bright and almost stellar; numerous almost stellar condensations.
16 s.n.

A small, moderately bright, slightly oval spiral 017 long; stellar nucleus; most
of the matter is in one whorl.

Vol. VIII, Plate 23. A beautiful, moderately bright spiral 9' x 3' in p.a, 40°.
Small, almost stellar nucleus and numerous almost stellar condensations.
28 s.n.

Slightly oval, 012 long; no structure discernible.

Small oval 017 long; bright center; no spiral structure discernible.

Vol. VIII, Plate 24. The bright stellar nuclei of this interesting pair are 138"
apart in p.a. 159°. Two nebulae close together, rather than a double nebula.
3226 is bright, nearly round, about 1' in diameter; no spiral structure
discernible. 3227 is 3' x '\'.2 in p.a. 155°, a patchy, compact spiral without
clearly marked whorls. 25 s.n.

Planetary. 1 s.n.

Coddington 's new nebula in Urxa Major, cf. Publ. Astr. Soc. Pac., 16, 123, 1893.
Exceedingly faint, scattered condensations covering an area perhaps 12'x 4'.
Probably an open, extremely faint spiral. 4 s.n.

An oval 2' long; nucleus very bright, and outer portions quite faint. Indis-
tinct traces of spiral character. 1 s.n.

A symmetrical spiral 4' x V in p.a. 45°; nucleus bright and small; the whorls
are narrow, faint, and show no condensations. 4 s.n.

Bright oval 015 long; probably spiral.

Somewhat elongated; 013 long; not very bright; doubtless spiral.

Nearly round, V in diameter; bright stellar nucleus. In the central portion,
about 014 in diameter, the whorls are quite bright, and compactly arranged;
the outermost whorls are very faint and well separated. 22 s.n.

Coarse cluster. D. O. Mills Reflector, Santiago, Chile.

A rather open spiral 3' x 1'5; nucleus faint and stellar; whorls rather faint. 1 s.n.

A beautiful, rather open, nearly round spiral. Nucleus is small and very
bright; the whorls show many almost stellar condensations. The diameter
of the main portion is 4', but there are a number of small patches in the
vicinity which may be more distant portions of the spiral. 20 s.n.

[table]

NGO8 DESCRIPTION— (Continued)

3346 10 38.3 +15 24 Quite faint; nearly round, 215 in diameter; stellar nucleus. A very open spiral

with numerous condensations, and some approach to the 0-type at the
center. 6 s.n.

3351 10 38.7 +12 14 A beautiful object; nearly round; 3' in diameter. The whorls are rather faint

and form an almost complete ring; a wide band of matter extends across
the nebula from one side to the other; an example of the 0-type spiral.
The center is exceedingly bright, and of unusual structure. It is about 12"
in diameter, and appears trinuclear; the center of the disk is not marked by
any condensation, but on its periphery are two stellar nuclei, and a short,
very bright, slightly curved mass. 10 s.n.

3372 10 41.2 —59 9 Nebulosity around if Carinae; only a portion of this nebula is shown on the

plate. D. O. Mills Reflector, Santiago, Chile.

3367 10 41.3 +14 16 Nearly round; 2' in diameter; a beautiful, rather bright spiral, showing across

its central portion of the band of matter characteristic of the i/>-type.
Nucleus bright, and stellar. Whorls are rather open and show a few almost
stellar condensations. I can not locate 3371 and 3373 in the positions
given. 30 s.n.

3368 10 41.5 +12 21 A fine strong spiral; brightest part 216 long. Bright stellar nucleus; the outer

whorl of the brighter structure forms a nearly complete oval ring; a much
fainter whorl outside this brings total length to about 7'. A clear-cut rift
goes in to nucleus on n.p. side. Reproduced in Publ. Astr. Soc. Pac., June,
1913, frontispiece. See Abs. Eff. 20 s.n.

2' x 1', with a rather large and very bright central portion; no spiral structure
discernible.

This, with 3384 and 3389, forms a striking group, a right-angled triangle
whose shorter sides are 7' long. 3379 is nearly round, 2' in diameter; very
bright; no spiral structure discernible. 33 s.n.

A replica of 3379 except that it is more oval; 3' long. Nucleus very bright
and elongated; no whorls can be distinguished, but it is probably a spiral
of the Andromeda type.

A fine, moderately bright, somewhat oval spiral 2' long; quite irregular; num-
erous condensations; weak nucleus. See Abs. Eff.

A very narrow spindle V.6 long in p.a. 82°. Nucleus nearly stellar and fairly
bright; it is displaced to one side of the central line, suggesting absorption
effects; doubtless an edgewise spiral. See Abs. Eff. 11 s.n.

215x1' in p.a. 70°; very bright center with an almost stellar nucleus; the
whorls are rather indistinct; are most prominent at the ends of the minor
axis, and fade out at the ends of the major axis.

2' long, somewhat oval; a 0-type spiral with a very bright, round nucleus. 9 s.n.

A small, rather regular, rather faint spiral, 1' in diameter, with a sharp
stellar nucleus.

A rather faint oval 018 long in p.a. 50°; a compact spiral with a faint nucleus.

Vol. VIII, Plate 26. An irregular, patchy spiral 8' x V.5 in p.a, 84°; quite
bright. Has a faint nucleus and shows a number of condensations, three
of which are almost stellar; a star of magn. 11 near the nucleus. See
Abs. Eff. 35 s.n.

Planetary. The "Owl" nebula, Vol. VIII, Plate 27. 107 s.n.

A small oval, 013 long, with much brighter center; no spiral structure dis-
cernible.

Slightly oval; 113 long; quite bright at center, with an almost stellar nucleus;
indistinct traces of whorls, and evidence of an absorbing lane on the n.
See Abs. Eff. 4 s.n.

015 in diameter; bright center and almost stellar nucleus; structureless.

Bright, narrow oval l18 long in p.a. 95°; no whorls distinguishable.

Nearly round, 1' in diameter; center quite bright and almost stellar; whorls
very faint and almost form a ring. 12 s.n.
3623 11 13.7 +13 38 Vol. VIII, Plate 28. A beautiful, bright spiral 8'x 2' in p.a, 174°. Whorls

rather indistinct, with one almost stellar condensation; bright, almost
stellar nucleus. Absorption lane on the east. M. 65. See Abs. Eff. 26 s.n.
+58 20 A faint, considerably elongated two-branched spiral, 1' long. Faint, almost

stellar nucleus.
+13 32 Vol. VIII, Plate 28. A very bright, beautiful, spiral 8' x 215 in p.a. 180°.
Bright, slightly elongated nucleus; the whorls are somewhat irregular and
show numerous condensations. M. 66.
+14 8 Moderately bright; 12' x V.5 in p.a. 100°. There are no well marked condensa-
tions. A wide dark lane runs down its entire length; the southern portion
is the narrower and fainter. An edgewise spiral. See Abs. Eff. 19 s.n.
+ 12 28 Described as "vF, vS, annular?." A very faint small, oblong patch, perhaps
015 long; not annular.

[table]
[table]
[table][ocr errors][merged small][ocr errors][ocr errors][table]

DESCRIPTION— (Continued)

A rather open spiral 3' x 1' in p.a. 0°. Nucleus stellar, and appears displaced to

one side of the central mass because of a well-marked dark lane on the east.

The whorls show a number of very faint, almost stellar condensations. See

Abs. Eff.
A spiral 1' in diameter. Whorls form a nearly perfect ring.
A slightly oval, rather patchy spiral V.2 long; fairly bright nucleus.
A fine, rather open, nearly round spiral, 2' in diameter. Stellar nucleus magn.

12-13; the two main whorls show numerous almost stellar condensations.

In addition to the four larger- nebulae, there are many small nebulae on this

plate; one-sixth of these are clearly spirals. In the case of the smaller and

fainter objects it is, of course, impossible to pronounce as to their spiral

character, but the proportion of spirals is doubtless a much larger one.

69 s.n. A moderately bright oval 018 x 015, crossed by a streak of brighter matter; a compact 0-type spiral. Faint and irregular; total diameter about 3'. Bifid; an edgewise spiral with

a wide absorbing lane. Fairly bright and sharp nucleus from which the

matter on the n.f. side extends in a faint fan. See Abs. Eff. 19 s.n. Vol. VIII, Plates 30A and 30B. A bright spiral 416x315 in p.a. 5°. Bright

stellar nucleus; whorls are somewhat irregular, open, and show many almost

stellar condensations. 0-type at center. 18 s.n. A moderately bright spiral 115 x 016, with most of the matter in a single whorl

which forms an irregular oval ring; almost stellar nucleus. A fine, bright, nearly round spiral, 2' in diameter; bright, almost stellar nucleus.

The two main whorls are rather open, and show numerous almost stellar

condensations. A moderately bright, binuclear patch about 013 in diameter ( two very small

nebulae close together?). A beautiful, nearly round, rather open and symmetrical spiral, 415 in diameter.

Stronger central portion, and an almost stellar nucleus. Many almost stellar

condensations. 39 s.n. m

A narrow oval 2' long in p.a. 0°; large nucleus; an irregular spiral.
A beautiful, slightly oval spiral 7' in length. Bright, almost stellar nucleus;

whorls are rather open and show a number of faint condensations; the

central portions show traces of the 0-type formation. 20 s.n. A faint spindle V long in p.a. 150°. An exceedingly faint, narrow oval 2' long in p.a. 160°. No spiral structure

discernible. A moderately bright, very narrow edgewise spiral 4' long in p.a. 70°. There

is a clear-cut dark lane down the middle in which is a star of magn. 12. See

Abs. Eff. 20 s.n.
A compact, rather faint, somewhat patchy oval 1'5 long; no nucleus apparent.

There is evidence of an absorption lane on the east. It is not binuclear as

described in the N. G. C. 42 s.n. A narrow, bright spindle, 3' long, in p.a. 176°, with a very bright, somewhat

enlarged center. Evidences of spiral character very indistinct, but it is

doubtless an edgewise spiral. 10 s.n. A rather bright, slightly oval spiral 2' long. Nucleus almost stellar; numerous

almost stellar condensations in the rather open whorls. A very bright narrow oval 4'x 1' in p.a. 83°. Nucleus bright, but not stellar.

Evidence of a short, curved, dark lane on the south. A spiral, though the

whorls are indistinct. The nucleus just shows in 2m on S23. 12 s.n. A nearly round spiral 2' in diameter. The outer whorls are rather open; the

center is occupied by compact, bright, somewhat irregular disk of matter

about 015 diameter; no true nucleus can be seen. A fine, rather bright spiral 4' x 2' in p.a. 122°. Very bright stellar nucleus.

There are numerous almost stellar condensations. It is a two-branched

spiral, and each branch is bifid. 15 s.n. A rather faint, compact, regular spiral 3' x 1' in p.a. 95°. The whorls are

rather patchy; faint stellar nucleus, which just shows in a 10m exposure.

11 s.n. A narrow spiral 6' x 1' in p.a. 18°. The whorls are distinct, but irregular.

Bright, rather large nucleus, considerably to the n. of apparent center of

the nebula; numerous almost stellar condensations. 12 s.n. A fairly bright, rather irregular spiral 4' x 1' in p.a. 162°. Nucleus bright,

but not stellar; whorls uniform in texture showing few condensations. 16 s.n. An open, patchy spiral 5'x 315 in p.a. 90°; shows numerous almost stellar condensations and a very faint nucleus. The nebular matter is faint, and the

description "B" of the N. G. C. seems unwarranted.

[table]
[table]

DESCRIPTION— (Continued)

Bright, small cluster 2' in diameter. Probably of globular type.

The nucleus is almost stellar, very bright, nearly equivalent to 10 magn. This is surrounded by a bright central portion which shows traces of spiral formation. Outside of this is a vacant ring. The outer whorls form an oval 216 x i16, and these are brightest at the ends of the major axis. It somewhat resembles the planetary type, and the observations of Messrs. Campbell and Paddock show that the nucleus has bright lines in its spectrum. It is undoubtedly a spiral, however. 40 s.n. 4156 12 5.8 +40 2 A small, rather bright spiral 1' long, slightly oval. Nucleus bright and almost

stellar. Shows traces of the i£-type formation in the central portions.

Faint, nearly round spiral, 017 in diameter.

An open, elongated spiral 8' x 2' in p.a. 150°. Bright stellar nucleus; numerous almost stellar condensations. Absorption effects on east side. Figure in Vogel I, No. 6 (Leip. Beob., Bd. 1). M. 98. See Abs. Eff. 30 s.n.

A greatly elongated spiral 4'x 016 in p.a. 5°. Quite faint; there is a faint nucleus, and evidence of an absorption lane at the east of the nucleus. See Abs. Eff.

A faint, narrow spindle 2' long in p.a. 120°; doubtless a spiral seen nearly edgewise.

A faint disk 012 in diameter; no structure discernible.

A compact, moderately bright spiral 2' x 1' in p.a. 65°. Bright, almost stellar nucleus; the whorls are somewhat patchy and irregular. See Abs. Eff. 26 s.n.

A very irregular aggregation of nebular matter and nebulous stars, which is about 8' x 4', with the very faint outlying condensations. There is apparently an almost stellar nucleus. The general appearance of the nebulosity is of the spiral type, but it is exceedingly irregular; not a nebulosity of the diffuse type. Quite bright. 13 s.n. 4216 12 10.8 +13 42 A greatly elongated spiral 7'x 1'in p.a. 18". The central portion is very bright,

showing well in a 10"' exposure, nucleus is not stellar. Well marked evidence of absorption lanes on the east. This, with 4206 and 4222, forms an interesting group of three almost edgewise spirals in the same field. See Abs. Eff. 41 s.n.

A very irregular oval patch 017 long, with a line of brighter matter down its
center; moderately bright; no nucleus discernible. Perhaps a very irregular
spiral. 22 s.n.

A fairly bright spiral 215 x 0'A in p.a. 135°. Bright, almost stellar nucleus.
Absorption effect along the n.e. side. See Abs. Eff.

Edgewise spiral 3' long in p.a. 60°; rather faint; no definite nucleus.

Non-existent.

Very faint; 10' to 12' long by about 2' broad; p.a. 165°. A few faint condensations, but no discernible nucleus. Quite irregular; probably an S-shaped spiral seen nearly edgewise.

Rather faint, nearly round, indistinct spiral 015 in diameter.

Faint oval spiral 017 long, with faint, almost stellar nucleus.

Vol. VIII, Plate 31. A fine, quite bright, edgewise spiral, 13'x 019 in p.a. 50°. An irregular dark lane runs down the middle. A few almost stellar condensations. Apparently no nucleus; though there is a star of magn. 14 in this position. See Abs. Eff. 10 s.n.

This is a faint, almost linear strip of nebulosity 1'x Oil in p.a. 110°; doubtless the central portion of an edgewise spiral.

A rather faint spindle I12 long in p.a. 47°; spiral.

This is a small 0-type nebulae with a fairly bright, almost stellar nucleus, and a very bright "cross-arm," which gives it a Saturn-\ike appearance; this line of matter is 01o long, and from its ends proceed very faint whorls. 4254 12 13.7 +14 59 Vol. VIII, Plate 32. A very bright, approximately round spiral 415 in diameter.

Nucleus almost stellar. There are two main whorls, rather open, which show many almost stellar condensations. M. 99. 47 s.n.

Narrow oval with brighter center, 018 long; traces of spiral structure.

Vol. VIII, Plate 33. With the very faint extensions this spiral is nearly 20'x 6' in p.a. 165°; very bright, elongated nuclear portion, on the west of which is a short dark lane; there are numerous almost stellar condensations in the two principal spiral branches. See Abs. Eff. 11 s.n.

Similar to 4257, but brighter.

Very bright; slightly oval, 116 long; large bright central portion, but no nucleus or spiral structure discernible.

Moderately bright; nearly round; 015 in diameter; a small 0-type spiral.

A faint spindle, l1o long; spiral. See Abs. Eff.

[table]
[table]
« PrécédentContinuer »