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

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

2002A&A...387..890M - Astronomy and Astrophysics, volume 387890-902 (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 - 2026 		#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 63 1
2 CD-57 3348 * 10 35 46.5644077488 -58 14 12.034964904 6.93 7.70 7.75 7.49 7.38 B1II 60 0
3 NGC 3293 OpC 10 35 50.3 -58 14 04           ~ 327 0
4 CPD-57 3522 * 10 35 56.5884258456 -58 11 31.603843788 9.31 10.11 10.13 10.10 10.10 B2III 38 0
5 CPD-57 3523 * 10 35 57.7156652832 -58 13 20.816447556 7.19 8.05 8.03 7.92 7.85 B1III 48 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 45 0
7 HD 92044 * 10 36 16.0790202360 -58 16 38.162765820 7.72 8.40 8.25 8.10 7.91 B1II 79 0
8 CD-59 4454 bC? 12 53 20.6734801416 -60 23 16.843450812 9.26 9.90 9.74 10.03   B1V 56 0
9 CPD-59 4535 * 12 53 24.00 -60 23 00.0 9.83 10.370 10.222     ~ 23 0
10 V* BU Cru EB* 12 53 37.6193092848 -60 21 25.425832356 6.49 7.04 6.84 7.55   B2Ib 115 0
11 NGC 4755 OpC 12 53 39.2 -60 22 07           ~ 300 0
12 CPD-59 4552 * 12 53 46.4935086912 -60 24 12.419407044 7.79 8.337 8.24 9.13   B1III 53 0
13 CPD-59 4553 * 12 53 46.5460448304 -60 22 18.370370064 9.16 9.75 9.58     B1.5V 24 0
14 * kap Cru SB* 12 53 48.9198156672 -60 22 34.469837436 5.62 6.12 5.94 7.12   B5I 133 0
15 CPD-59 4564 bC* 12 53 57.5386794336 -60 24 58.092625152 8.45 9.12 9.06 9.64   B2III 65 0
16 HD 111990 s*b 12 53 59.7993033672 -60 20 07.510329996 6.46 6.95 6.78 7.68   B1.5I+ 88 0
17 CPD-41 7727 SB* 16 54 09.2737061088 -41 48 41.072216580 8.964 9.564 9.424   9.134 B1V 40 0
18 CD-41 11034 Y*? 16 54 11.3119116264 -41 48 53.965557072 8.878 9.546 9.335 9.744 8.943 B1V 45 0
19 HD 152249 s*b 16 54 11.6395658856 -41 50 57.295111524 5.91 6.65 6.45     OC9Iab 254 0
20 CD-41 11037 SB* 16 54 13.2253067352 -41 50 32.518100184 7.21 8.08 7.90     O9IV 78 0
21 HD 326329 Y*O 16 54 14.1033282720 -41 50 08.503512720 8.141 9.183 9.013 9.477 8.460 O9.7V 78 0
22 NGC 6231 OpC 16 54 14.4 -41 48 53           ~ 562 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 52 0
24 HD 152314 ** 16 54 32.0048577720 -41 48 18.848961036 7.256 7.974 7.749 9.01 7.446 O9IV 113 0

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