2010A&A...510A..22S


Query : 2010A&A...510A..22S

2010A&A...510A..22S - Astronomy and Astrophysics, volume 510, A22-22 (2010/2-1)

The chemical composition of the Orion star forming region. I. Homogeneity of O and Si abundances in B-type stars.

SIMON-DIAZ S.

Abstract (from CDS):

Recent accurate abundance analyses of B-type main sequence stars in the solar vicinity has shown that abundances derived from these stellar objects are more homogeneous and metal-rich than previously thought. We investigate whether the inhomogeneity of abundances previously found in B-type stars in the OriOB1 association is real (hence a signature of enrichment of the newly formed stars in an induced star formation scenario) or a consequence of intrinsic errors induced by the use of photometric indices to establish the stellar parameters prior to the abundance analysis. We obtained a new (improved) spectroscopic dataset comprising 13 B-type stars in the various OriOB1 associations, and performed a detailed, self-consistent spectroscopic abundance analysis by means of the modern stellar atmosphere code fastwind. We detect systematic errors in the stellar parameters determined previously which affect the derived abundances. Once these errors are accounted for, we find a high degree of homogeneity in the O and Si abundances for stars in the four OriOB1 subgroups. The derived abundances are in very good agreement with recent determinations in other B-type stars in the solar vicinity. We also compare our results with those obtained for the Sun during the epoch of the ``solar crisis'', and the Orion nebula.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: atmospheres - stars: fundamental parameters - stars: abundances

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * o Ori SB* 05 21 45.7486099227 -00 22 56.910484984 3.79 4.58 4.74 4.79 4.97 B2IV 224 0
2 HD 35299 * 05 23 42.3085483712 -00 09 35.345389512 4.610 5.490 5.700 5.77 5.96 B2III 191 0
3 HD 35912 * 05 28 01.4701126086 +01 17 53.706832763 5.52 6.212 6.380     B2/3V 134 0
4 HD 36285 * 05 30 20.7534797908 -07 26 05.332049852 5.29 6.130 6.313     B2III 111 0
5 HD 36430 * 05 31 20.8929071446 -06 42 30.163153293 5.29 6.041 6.208     B3V 121 0
6 HD 36595 * 05 31 40.4025673746 -28 06 17.713308609   9.35 8.37     K1III 11 0
7 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 390 0
8 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 231 1
9 HD 36629 Y*O 05 32 57.0824642468 -04 33 59.334371517 7.01 7.67 7.65 7.53 7.53 B2V 176 0
10 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 247 0
11 HD 36959 Y*O 05 35 01.0063388388 -06 00 33.371107627 4.52 5.33 5.53     B1.2 197 0
12 HD 36960 * 05 35 02.6807398 -06 00 07.303539 3.52 4.50 4.72     B1/2Ib/II 250 0
13 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 466 1
14 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 311 0
15 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 524 0
16 M 42 HII 05 35 17.3 -05 23 28           ~ 3853 0
17 NAME Ori Complex Cld 05 35.3 -05 23           ~ 369 0
18 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 131 1
19 * tet02 Ori B Y*O 05 35 26.4004225055 -05 25 00.792538337 5.36 6.29 6.38 6.29 11.050 B2-B5 184 0
20 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 873 0
21 NAME Ori I As* 05 38 -02.8           ~ 574 0
22 HD 37744 V* 05 40 37.2961902857 -02 49 30.847246646 5.14 6.02 6.22     B2IV 140 0
23 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 931 1
24 * nu. Ori SB* 06 07 34.3258759 +14 46 06.506096 3.6 4.240 4.397     B3V 225 0
25 NAME Ass Ori OB 1-D As* ~ ~           ~ 9 0
26 Ass Ori OB 1a As* ~ ~           ~ 210 0

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2021.11.30-17:23:43

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