2006A&A...456.1131M


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET21:27:03

2006A&A...456.1131M - Astronomy and Astrophysics, volume 456, 1131-1151 (2006/9-4)

The VLT-FLAMES survey of massive stars: mass loss and rotation of early-type stars in the SMC.

MOKIEM M.R., DE KOTER A., EVANS C.J., PULS J., SMARTT S.J., CROWTHER P.A., HERRERO A., LANGER N., LENNON D.J., NAJARRO F., VILLAMARIZ M.R. and YOON S.-C.

Abstract (from CDS):

We have studied the optical spectra of a sample of 31 O- and early B-type stars in the Small Magellanic Cloud, 21 of which are associated with the young massive cluster NGC 346. Stellar parameters are determined using an automated fitting method (Mokiem et al., 2005A&A...441..711M), which combines the stellar atmosphere code fastwind (Puls et al., 2005A&A...435..669P) with the genetic algorithm based optimisation routine pikaia (Charbonneau, 1995ApJS..101..309C). Comparison with predictions of stellar evolution that account for stellar rotation does not result in a unique age, though most stars are best represented by an age of 1-3Myr. The automated method allows for a detailed determination of the projected rotational velocities. The present day vrsini distribution of the 21 dwarf stars in our sample is consistent with an underlying rotational velocity (vr) distribution that can be characterised by a mean velocity of about 160-190km/s and an effective half width of 100-150km/s. The vr distribution must include a small percentage of slowly rotating stars. If predictions of the time evolution of the equatorial velocity for massive stars within the environment of the SMC are correct (Maeder & Meynet, 2001A&A...373..555M), the young age of the cluster implies that this underlying distribution is representative for the initial rotational velocity distribution. The location in the Hertzsprung-Russell diagram of the stars showing helium enrichment is in qualitative agreement with evolutionary tracks accounting for rotation, but not for those ignoring vr. The mass loss rates of the SMC objects having luminosities of logL*/L>5.4 are in excellent agreement with predictions by Vink et al. (2001A&A...369..574V). However, for lower luminosity stars the winds are too weak to determine {dot}(M) accurately from the optical spectrum. Three targets were classifiedas Vz stars, two of which are located close to the theoretical zero-age main sequence. Three lower luminosity targets that were not classified as Vz stars are also found to lie near the ZAMS. We argue that this is related to a temperature effect inhibiting cooler from displaying the spectral features required for the Vz luminosity class.

Abstract Copyright:

Journal keyword(s): galaxies: Magellanic Clouds - stars: atmospheres - stars: early-type - stars: fundamental parameters - stars: mass-loss - stars: rotation

Simbad objects: 38

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Number of rows : 38

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 LIN 78 Em* 00 46 32.63 -73 06 05.7 12.53 13.59 13.7   13.85 O3/4V 41 1
2 SK 10 s*b 00 46 42.1589052355 -73 24 55.493791820 11.903 12.984 13.176   13.35 O6.5I(f) 40 0
3 BBB SMC 266 s*b 00 47 50.0479771506 -73 08 21.054254136   12.35 12.55 12.36   O6I(f) 65 0
4 AzV 95 * 00 51 21.5997393360 -72 44 14.875524423 12.67 13.64 13.83   13.95 O7III((f)) 35 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9694 1
6 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 370 0
7 Cl* NGC 330 ELS 52 * 00 56 30.9965466180 -72 18 53.406596595 14.33 15.41 15.55   15.71 O8.5Vn 7 0
8 AzV 186 * 00 57 26.9388728646 -72 33 13.560551338 12.66 13.88 13.86   14.15 O8III((f)) 23 0
9 Cl* NGC 346 MPG 12 * 00 58 14.24 -72 10 45.0   19.15 17.98   16.72 B0IV(Nstr) 30 0
10 AzV 202 * 00 58 14.4681951686 -72 07 29.551543096 13.12 14.18 14.34   14.52 B1Ib 15 0
11 Cl* NGC 346 ELS 90 * 00 58 25.6991088952 -72 14 33.373369672 14.64 15.71 15.85   16.11 O9.5V 6 0
12 Cl* NGC 346 ELS 28 * 00 58 31.7535036663 -72 10 57.966053276 13.58 14.73 14.94   15.23 OC6Vz 25 0
13 Cl* NGC 346 ELS 66 * 00 58 45.903 -72 11 36.95 14.40 15.51 15.72   15.97 O9.5V 8 0
14 Cl* NGC 346 MPG 217 Em* 00 58 46.884 -72 13 02.34   14.66 14.78   14.62 O9.5IIIe 12 0
15 Cl* NGC 346 ELS 77 * 00 58 48.9420042955 -72 09 52.106287967 14.64 15.64 15.62   16.09 O9V 10 0
16 Cl* NGC 346 ELS 50 * 00 58 55.2201548139 -72 09 06.692331621 14.07 15.24 15.49   15.80 O8Vn 10 0
17 Cl* NGC 346 ELS 93 * 00 58 55.59 -72 10 07.3   15.82 16.01     B0V 8 0
18 Cl* NGC 346 ELS 7 * 00 58 57.3952116864 -72 10 33.661396129 12.68 13.82 14.13   14.28 O4V((f+)) 49 0
19 Cl* NGC 346 ELS 112 * 00 58 58.529 -72 12 06.84   16 16.24     O9.5V 7 0
20 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 452 0
21 Cl* NGC 346 ELS 97 * 00 59 08.534 -72 11 12.66   15.99 16.06     O9V 8 0
22 Cl* NGC 346 ELS 51 * 00 59 08.6953446077 -72 10 14.138252086 14.03 15.17 15.40   15.62 O7Vz 13 0
23 Cl* NGC 346 ELS 107 * 00 59 10.379 -72 10 28.53   15.93 16.20     O9.5V 9 0
24 [MA93] 1125 Em* 00 59 11.646 -72 09 57.52   14.82 15.07 15.34   O5.5V 22 0
25 Cl* NGC 346 ELS 22 * 00 59 18.6174080795 -72 11 09.889202050   14.65 14.91     O9V 18 0
26 AzV 226 * 00 59 20.7287691158 -72 17 10.615963093 12.97 14.12 14.19     O7IIIn((f)) 24 0
27 Cl* NGC 346 ELS 46 Y*O 00 59 31.8673648673 -72 13 35.226471460   15.16 15.44     O7Vn 11 0
28 SK 80 s*b 00 59 31.9755771921 -72 10 46.109784216   12.12 12.31     O7Iaf+ 105 0
29 Cl* NGC 346 ELS 25 * 00 59 52.9545967254 -72 10 49.136667983 13.62 14.72 14.90   15.20 O9V 8 0
30 Cl* NGC 346 ELS 31 * 00 59 54.0609710475 -72 04 31.421162212 13.71 14.81 15.05   15.33 O8Vz 15 0
31 SK 84 * 01 00 06.7254391957 -72 47 19.125602155 12.58 13.71 13.91   14.16 O6V 40 0
32 SK 116 s*b 01 04 55.7399449710 -72 46 48.149096337 11.413 12.494 12.646     O9Iabw 31 0
33 AzV 388 * 01 05 39.5300741914 -72 29 26.938445353 12.79 13.86 14.12   14.37 O5V 37 0
34 SK 148 * 01 12 29.0069137975 -72 29 29.052551304 11.913 13.014 13.176   13.32 O8.5II((f)) 40 0
35 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5854 1
36 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15187 1
37 * eta Car Em* 10 45 03.5455050 -59 41 03.951060 6.37 7.034 6.21 4.90 4.41 OBepec 2253 0
38 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 954 2

    Equat.    Gal    SGal    Ecl

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2021.02.24-21:27:03

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