2019A&A...626A..50D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST06:17:04

2019A&A...626A..50D - Astronomy and Astrophysics, volume 626A, 50-50 (2019/6-1)

A census of massive stars in NGC 346. Stellar parameters and rotational velocities.

DUFTON P.L., EVANS C.J., HUNTER I., LENNON D.J. and SCHNEIDER F.R.N.

Abstract (from CDS):

Spectroscopy for 247 stars towards the young cluster NGC 346 in the Small Magellanic Cloud has been combined with that for 116 targets from the VLT-FLAMES Survey of Massive Stars. Spectral classification yields a sample of 47 O-type and 287 B-type spectra, while radial-velocity variations and/or spectral multiplicity have been used to identify 45 candidate single-lined (SB1) systems, 17 double-lined (SB2) systems, and one triple-lined (SB3) system. Atmospheric parameters (Teff and log g) and projected rotational velocities (vesini) have been estimated usingTLUSTY model atmospheres; independent estimates of vesini were also obtained using a Fourier Transform method. Luminosities have been inferred from stellar apparent magnitudes and used in conjunction with the Teff and vesini estimates to constrain stellar masses and ages using theBONNSAI package. We find that targets towards the inner region of NGC 346 have higher median masses and projected rotational velocities, together with smaller median ages than the rest of the sample. There appears to be a population of very young targets with ages of less than 2Myr, which have presumably all formed within the cluster. The more massive targets are found to have lower projected rotational velocities consistent with previous studies. No significant evidence is found for differences with metallicity in the stellar rotational velocities of early-type stars, although the targets in the Small Magellanic Cloud may rotate faster than those in young Galactic clusters. The rotational velocity distribution for single non-supergiant B-type stars is inferred and implies that a significant number have low rotational velocity (~=10% with ve<40km/s), together with a peak in the probability distribution at ve~=300km/s. Larger projected rotational velocity estimates have been found for our Be-type sample and imply that most have rotational velocities between 200-450km/s.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: early-type - stars: atmospheres - stars: rotation - stars: evolution - Magellanic Clouds - open clusters and associations: individual: NGC 346

Status in Simbad:  being processed

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 57 GiG 00 15 30.873 +17 19 42.22   13.7       ~ 76 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9092 1
3 NGC 330 Cl* 00 56 20.59 -72 27 12.5 9.37 9.76 9.55   8.89 ~ 359 0
4 AzV 182 * 00 57 00.7176690083 -72 08 11.365729792 13.04 14.19 14.29   14.23 B0III 10 0
5 SK 73 s*b 00 58 35.7845024129 -72 16 25.021114826 11.73 12.63 12.66   12.69 B2Ia 26 0
6 AzV 214 s*b 00 58 54.7789815299 -72 13 17.171816714   13.40 13.39     B1Ia/Iab 33 0
7 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 441 0
8 AzV 219 ** 00 59 06.8644944513 -72 16 35.947332601 13.31 14.30 14.53   14.72 B1-3(II) 8 0
9 [BS95] 90 Cl* 00 59 07.25 -72 08 59.1 12.94 13.01 12.25   11.88 ~ 25 0
10 AzV 220 Em* 00 59 09.9684677094 -72 05 48.278343943 13.13 14.24 14.51   14.73 O7If 32 0
11 HD 5980 WR* 00 59 26.5847969465 -72 09 53.927725716   11.13 11.31   11.029 WN4+O7I: 355 1
12 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 214 0
13 SK 81 * 00 59 43.5060406678 -72 04 18.841284259 12.023 12.894 12.996   12.44 B3I 12 0
14 AzV 238 ** 00 59 55.5072197088 -72 13 37.781814622   13.55 13.77     O9III 30 0
15 PSR J0100-7211 Psr 01 00 42.86 -72 11 33.3   17.69 17.82     B3V 84 0
16 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
17 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14325 1
18 NGC 2004 Cl* 05 30 41.340 -67 17 21.83   9.6       ~ 257 0
19 UCAC2 1803231 * 05 37 39.2305260100 -69 09 51.024963212 15.220 16.099 15.806 16.07 15.118 O9:Vnnne+ 20 0
20 PSR J0537-6910 Psr 05 37 46.66 -69 10 17.1           ~ 214 1
21 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1026 2
22 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1674 2
23 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 812 1
24 NGC 6611 24 * 18 18 08.6479539252 -13 43 58.587574435   14.968 14.183     A7IV 5 0
25 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 919 2

    Equat.    Gal    SGal    Ecl

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2019.10.23-06:17:05

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