1999ApJ...522..950D

Query : 1999ApJ...522..950D

1999ApJ...522..950D - Astrophys. J., 522, 950-959 (1999/September-2)

Chemical abundances of OB stars in the Cepheus OB2 association.

DAFLON S., CUNHA K. and BECKER S.R.

Abstract (from CDS):

LTE and non-LTE abundances of carbon, nitrogen, oxygen, and silicon, as well as LTE abundances of Fe, are presented from analyses of C II, N II, O II, Si III, and Fe III lines in the spectra of eight main-sequence OB stars in the Cep OB2 association. We find that the chemical composition of the studied stars in this association is very homogeneous: the abundances of all elements analyzed do not show significant variations, and the observed abundance dispersions can be explained in terms of the uncertainties in the analysis. The abundance results indicate that this association is slightly metal poor ([Fe/H]=-0.3) with the abundances of all studied elements being subsolar by roughly the same amount.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (Cepheus OB2) - Stars: Abundances - Stars: Early-Type

Simbad objects: 23

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Number of rows : 23
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 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 508 0
2 * tet02 Ori B Y*O 05 35 26.4007537560 -05 25 00.793767576 5.36 6.29 6.38 6.29 11.050 B0.7V 206 0
3 NAME Ori I As* 05 38 -02.8           ~ 653 0
4 HD 205794 * 21 35 43.8316516008 +57 28 03.479149560 8.22 8.71 8.43     B0.5V 54 0
5 HD 205948 * 21 36 47.8726823400 +57 35 02.095597860 8.33 8.90 8.65     B2V 44 0
6 HD 206183 * 21 38 26.2840588344 +56 58 25.459055868 6.75 7.55 7.41     O9.5IV-V 103 0
7 HD 239724 * 21 38 39.5275902672 +57 22 01.710139188 9.02 9.51 9.14     B1III 33 0
8 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
9 LS III +57 12 Y*O 21 38 56.7210584448 +57 29 39.130347948 7.53     8.73   B1V 51 0
10 HD 206267 Y*O 21 38 57.6195772032 +57 29 20.554016280 5.09 5.83 5.62   5.56 O6.0V((f))+O9:V 520 0
11 HD 206327 Pu* 21 39 01.0400603472 +61 33 22.136201532 8.31 9.37 9.19     B2V 50 0
12 HD 239729 Y*O 21 39 27.4057254792 +57 29 00.810299364 8.17 8.71 8.35   7.96 B0V 82 0
13 HD 239743 ** 21 42 46.6303123536 +60 17 45.319034400 9.45 9.53 9.03     B2V 34 0
14 HD 239742 * 21 42 52.1025167088 +57 01 01.028642880 9.05 9.61 9.41     B2V 39 0
15 HD 207538 * 21 47 39.7896725544 +59 42 01.348647696 7 7.55 7.30     O9.7IV 213 1
16 HD 207951 * 21 50 40.6352978976 +61 48 11.235158640 7.75 8.30 8.18     B2V 37 0
17 Ass Cep OB 2 As* 21 51 +60.0           ~ 303 0
18 HD 208266 bC? 21 53 00.3461714376 +60 38 32.647776252 7.78 8.36 8.14     B1V 58 0
19 NGC 7160 OpC 21 53 44.8 +62 35 33   6.34 6.1     ~ 243 0
20 HD 209339 ** 22 00 39.2649125112 +62 29 16.063886004 5.9 8.73 8.51 7.61   O9.7IV 196 0
21 * lam Cep s*b 22 11 30.5765111040 +59 24 52.154264880 4.55 5.29 5.05 4.77 4.62 O6.5I(n)fp 705 1
22 Ass Cep OB 2b As* ~ ~           ~ 6 0
23 Ass Cep OB 2a As* ~ ~           ~ 8 0

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