2002A&A...387..890M


Query : 2002A&A...387..890M

2002A&A...387..890M - Astronomy and Astrophysics, volume 387, 890-902 (2002/6-1)

Light element abundances in the young open clusters NGC 3293, NGC 4755 and NGC 6231: Tracers of stellar evolution.

MATHYS G., ANDRIEVSKY S.M., BARBUY B., CUNHA K. and KOROTIN S.A.

Abstract (from CDS):

The abundances of He (LTE), C, N, and O (NLTE) were derived for 21 B stars in three young open clusters. Almost all the stars show subsolar CNO abundances. However, the mean oxygen abundance for each programme cluster appears to be in marginal agreement with the most recent revisions of the solar value. After consideration of the CN abundances in this sample, there is no clear evidence of internal mixing. Only three stars among the non-supergiants seem to show a nitrogen enhancement. Two of them have a fairly low projected equatorial velocity (admittedly, they may be rapid rotators seen pole-on); the third one is a definite fast rotator. In the lower gravity stars (three stars in this sample with logg<3.0) some kind of mixing has apparently occurred. The supergiants do not differ significantly from the other programme stars in their respective helium contents. The mean helium abundance for each cluster is close to the standard value, (He/H) ≃11.0.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: NGC 3293, NGC 4755, NGC 6231 - stars: abundances - stars: early type

CDS comments: In reflist, Arp, 1958, AJ : 431 misprint for 341 (1958AJ.63.341A).

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V403 Car bC* 10 35 40.7035044864 -58 12 44.280907776 7.93 8.75 8.73 9.48 8.65 B1III 55 1
2 CD-57 3348 * 10 35 46.5644077488 -58 14 12.034964904 6.93 7.70 7.75 7.49 7.38 B1II 53 0
3 NGC 3293 OpC 10 35 52.8 -58 13 52           ~ 312 0
4 CPD-57 3522 * 10 35 56.5884258456 -58 11 31.603843788 9.31 10.11 10.13 10.10 10.10 B2III 35 0
5 CPD-57 3523 * 10 35 57.7156652832 -58 13 20.816447556 7.19 8.05 8.03 7.92 7.85 B1III 43 0
6 V* V406 Car bC* 10 35 57.8106305760 -58 12 21.308777280 8.39 9.22 9.26 9.24 9.20 B1V 42 0
7 HD 92044 * 10 36 16.0790202360 -58 16 38.162765820 7.72 8.40 8.25 8.10 7.91 B1II 71 0
8 CD-59 4454 bC? 12 53 20.6734801416 -60 23 16.843450812 9.26 9.90 9.74 10.03   B1V 53 0
9 CPD-59 4535 * 12 53 24.00 -60 23 00.0 9.83 10.370 10.222     ~ 22 0
10 V* BU Cru EB* 12 53 37.6193092848 -60 21 25.425832356 6.49 7.04 6.84 7.55   B2Ib 112 0
11 NGC 4755 OpC 12 53 39.6 -60 22 16           ~ 289 0
12 CPD-59 4552 * 12 53 46.4935086912 -60 24 12.419407044 7.79 8.337 8.24 9.13   B1III 51 0
13 CPD-59 4553 * 12 53 46.5460448304 -60 22 18.370370064 9.16 9.75 9.58     B1.5V 21 0
14 * kap Cru SB* 12 53 48.9198156672 -60 22 34.469837436 5.62 6.12 5.94 7.12   B5I 127 0
15 CPD-59 4564 bC* 12 53 57.5386794336 -60 24 58.092625152 8.45 9.12 9.06 9.64   B2III 62 0
16 HD 111990 s*b 12 53 59.7993033672 -60 20 07.510329996 6.46 6.95 6.78 7.68   B1.5I+ 85 0
17 CPD-41 7727 SB* 16 54 09.2737061088 -41 48 41.072216580 8.964 9.564 9.424   9.134 B1V 37 0
18 NGC 6231 OpC 16 54 10.8 -41 48 43           ~ 539 0
19 CD-41 11034 Y*? 16 54 11.3119116264 -41 48 53.965557072 8.878 9.546 9.335 9.744 8.943 B1V 42 0
20 HD 152249 s*b 16 54 11.6395658856 -41 50 57.295111524 5.91 6.65 6.45     OC9Iab 239 0
21 CD-41 11037 SB* 16 54 13.2253067352 -41 50 32.518100184 7.21 8.08 7.90     O9IV 75 0
22 HD 326329 Y*O 16 54 14.1033282720 -41 50 08.503512720 8.141 9.183 9.013 9.477 8.460 O9.7V 73 0
23 V* V1208 Sco Y*O 16 54 21.3090092232 -41 51 41.766233904 9.293 9.91 9.708 9.96 9.344 B0-2V 47 0
24 HD 152314 Y*? 16 54 32.0048577720 -41 48 18.848961036 7.256 7.974 7.749 9.01 7.446 O9IV 108 0

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