2009A&A...495..257M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET01:46:53

2009A&A...495..257M - Astronomy and Astrophysics, volume 495, 257-270 (2009/2-3)

Properties of WNh stars in the small Magellanic cloud: evidence for homogeneous evolution.

MARTINS F., HILLIER D.J., BOURET J.C., DEPAGNE E., FOELLMI C., MARCHENKO S. and MOFFAT A.F.

Abstract (from CDS):

We aim to assess the nature of three WNh stars in the SMC, to constrain stellar evolution beyond the main sequence at low metallicity, and to investigate the metallicity dependence of the clumping properties of massive stars. We compute atmosphere models to derive the stellar and wind properties of the three WNh targets. A FUV/UV/optical/near-infrared analysis gives access to temperatures, luminosities, mass loss rates, terminal velocities and stellar abundances. We find that all stars still have a large hydrogen mass fraction in their atmosphere, and show clear signs of CNO processing in their surface abundances. One of the targets can be accounted for by normal stellar evolution. It is a star with an initial mass around 40-50M in, or close to, the core He burning phase. The other two objects likely follow a peculiar evolution, governed by fast rotation. In particular, one object is likely evolving homogeneously due to its position blue-ward of the main sequence and its high H mass fraction. The clumping factor of one star is found to be 0.15 ±0.05. This is comparable to values found for Galactic Wolf-Rayet stars, indicating that within the uncertainties, the clumping factor does not seem to depend on metallicity.

Abstract Copyright:

Journal keyword(s): stars: Wolf-Rayet - stars: evolution - stars: atmospheres - stars: wind, outflows - Magellanic Clouds

CDS comments: Stars SMC-WRN are SMC AB N in Simbad. Paragraph 5.2 MPG 335 is a probable misprint for Cl* NGC 346 MPG 355.

Simbad objects: 14

goto Full paper

goto View the reference in ADS

Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 SMC AB 1 WR* 00 43 42.3082179697 -73 28 55.260280231 14.33 15.20 15.24   15.21 WN3+O4: 29 0
2 SMC AB 2 WR* 00 48 30.8442971820 -73 15 45.831809104 13.23 14.23 14.43   14.52 WN4.5/O3 47 0
3 LIN 143 WR* 00 49 59.3503462072 -73 22 14.123185037 13.48 14.43 14.56   14.57 WN3/4+O4 36 0
4 LIN 160 WR* 00 50 43.43 -73 27 05.7 12.363 13.304 13.426   13.55 WN6 46 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9708 1
6 Cl* NGC 346 W 3 * 00 59 00.7582411392 -72 10 28.171999499 11.46 12.61 12.80   13.63 O2III(f) 58 0
7 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 453 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5867 1
9 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15211 1
10 HD 50896 WR* 06 54 13.0440847499 -23 55 42.020318514 5.74 6.63 6.91 7.74   WN4b 748 0
11 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2255 0
12 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 60 0
13 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 971 1
14 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 649 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...495..257M and select 'bookmark this link' or equivalent in the popup menu


2021.03.05-01:46:53

© Université de Strasbourg/CNRS

    • Contact