2001A&A...367..605A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:45:40

2001A&A...367..605A - Astronomy and Astrophysics, volume 367, 605-612 (2001/2-4)

Magellanic Clouds elemental abundances from F supergiants: revisited results for the Large Magellanic Cloud.

ANDRIEVSKY S.M., KOVTYUKH V.V., KOROTIN S.A., SPITE M. and SPITE F.

Abstract (from CDS):

With an improved method of the LTE abundance analysis for most elements (Kovtyukh & Andrievsky, 1999A&A...351..597K), the abundances have been re-investigated in nine F supergiants of the Large Magellanic Cloud. The NLTE calculations for carbon, oxygen and sodium, based on Kurucz's atmospheric models with an over-all metal deficiency, were carried out. The most important results are the following: - carbon abundance in supergiants is in much better agreement with the carbon abundance of the LMC HII regions, oxygen remaining in fair agreement with HII regions. The (C/O) ratio is low, lower than solar and the HII ratios (a possible sign of the first dredge-up, or another large-scale mixing event in the supergiant atmospheres); - the NLTE computations do not show remarkable sodium overabundances in the LMC supergiants, in contrast with the Galactic supergiants; - the mean abundance of iron is found to be [Fe/H]=-0.40, slightly lower than the results of some previous determinations for the LMC, but in agreement with the recent result obtained by Korn et al. (2000A&A...353..655K), who give [Fe/H]=-0.41. The relative to iron abundance of oxygen [O/Fe]=+0.01 derived from nine F supergiants appears to be in excellent accordance with predictions based on the smooth model of the LMC evolution; - the (α/Fe) ratios are comparable to those found in previous analyses. The surprisingly low abundance of Mg is even lower in the new analysis, but it is in good agreement with the relative magnesium abundance in LMC B-stars [Mg/H]=-0.62 determined by Korn et al. (2000A&A...353..655K). Sulphur in the program supergiants shows the same abundance within an error bar as in HII regions; - the iron-group elements follow the solar distribution of the (M/Fe) ratios; - the heavy elements show enhanced abundances; - significantly larger logg values were obtained than in a previous study, resulting in supergiant masses of about 10-20M, which are in excellent agreement with evolutionary calculations.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: NLTE -analysis - supergiants - Magellanic Clouds

CDS comments: table 1 : Stars GNNN are GV NNN

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9446 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
3 SOI 113 * 04 56 54.7065980921 -67 05 09.555036586   13.137 12.691     F3Iab 17 0
4 HD 271018 * 05 07 14.1801584343 -66 03 18.431792075 12.42 12.01 11.43 10.88 11.017 ~ 37 0
5 HD 269187 sg* 05 14 04.4266576033 -67 15 50.535464702 11.99 11.74 11.49     A9Ia 23 0
6 HD 269355 s*y 05 18 38.6605496204 -69 45 46.697316192 12.08 11.69 11.24     F6Ia 35 0
7 SOI 49 * 05 22 18.4446504844 -66 54 59.070566551   12.75 12.26     F8Ib 27 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
9 TYC 8891-1219-1 * 05 28 54.6300497593 -66 01 28.376404785   12.72 12.51     F0II: 16 0
10 SK -66 161 * 05 35 31.1141643511 -66 45 24.153545003 12.59 12.23 11.90     F5I: 21 0
11 HD 269868 * 05 36 34.4426561218 -67 40 31.338605261   12.82 12.36 12.06   F8I: 28 0
12 HD 270025 * 05 42 09.3330696359 -68 27 31.157934244   12.43 11.89 11.58   F8I: 36 0
13 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 676 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:45:40

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