2006A&A...451..603D


Query : 2006A&A...451..603D

2006A&A...451..603D - Astronomy and Astrophysics, volume 451, 603-611 (2006/5-4)

B-type supergiants in the Small Magellanic Cloud: rotational velocities and implications for evolutionary models.

DUFTON P.L., RYANS R.S.I., SIMON-DIAZ S., TRUNDLE C. and LENNON D.J.

Abstract (from CDS):

High-resolution spectra for 24 SMC and Galactic B-type supergiants have been analysed to estimate the contributions of both macroturbulence and rotation to the broadening of their metal lines. Two different methodologies are considered, viz. goodness-of-fit comparisons between observed and theoretical line profiles and identifying zeros in the Fourier transforms of the observed profiles. The advantages and limitations of the two methods are briefly discussed with the latter techniques being adopted for estimating projected rotational velocities (vsini) but the former being used to estimate macroturbulent velocities. The projected rotational velocity estimates range from approximately 20 to 60km/s, apart from one SMC supergiant, Sk191, with a vsini≃90km/s. Apart from Sk191, the distribution of projected rotational velocities as a function of spectral type are similar in both our Galactic and SMC samples with larger values being found at earlier spectral types. There is marginal evidence for the projected rotational velocities in the SMC being higher than those in the Galactic targets but any differences are only of the order of 5-10km/s, whilst evolutionary models predict differences in this effective temperature range of typically 20 to 70km/s. The combined sample is consistent with a linear variation of projected rotational velocity with effective temperature, which would imply rotational velocities for supergiants of 70km/s at an effective temperature of 28000K (approximately B0 spectral type) decreasing to 32km/s at 12000K (B8 spectral type). For all targets, the macroturbulent broadening would appear to be consistent with a Gaussian distribution (although other distributions cannot be discounted) with an (1)/(e) half-width varying from approximately 20km/s at B8 to 60km/s at B0 spectral types.

Abstract Copyright:

Journal keyword(s): galaxies: Magellanic Clouds - stars: early-type - stars: supergiants

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 - 2024
#notes
1 * kap Cas s*b 00 32 59.9918836206 +62 55 54.413126128 3.50 4.30 4.16 4.02 3.96 BC0.7Ia 462 0
2 SK 13 s*b 00 47 12.2164410744 -73 06 33.111710784   12.52 12.48     B2.5Ia 71 0
3 BBB SMC 259 s*b 00 47 38.7409708152 -73 07 48.851948496   12.17 12.24     B5Ia 33 0
4 HD 5045 s*b 00 50 38.3868754296 -73 28 18.256667052   11.02 11.04     B1.5Ia+ 84 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11178 1
6 SK 73 s*b 00 58 35.7838206672 -72 16 25.018020660 11.73 12.63 12.66   12.69 B1.5Ia 27 0
7 SK 76 s*b 00 58 55.6254525024 -72 32 08.467356804 11.64 12.65 12.75   12.84 BN0Ia 41 0
8 RMC 18 s*b 01 00 06.8830919184 -72 13 57.371461032   11.7 11.5     B1Ia 66 0
9 RMC 25 s*b 01 02 21.4891243296 -72 00 17.596952676 11.753 12.704 12.836   12.69 B1.5Iab 18 0
10 RMC 36 s*b 01 04 49.3494336384 -72 06 21.746153556 10.57 11.34 11.36     B3Ia 51 0
11 AzV 374 * 01 05 01.8635159352 -72 26 53.789152056 12.04 12.96 13.10   13.224 B2Ib 15 0
12 SK 145 s*b 01 11 25.9167352608 -72 31 21.276515892 11.463 12.464 12.596   11.60 B2.5Ia 38 0
13 SK 150 s*b 01 13 01.8742585512 -72 45 48.441989592 11.593 12.564 12.676   11.42 B2Ia 29 0
14 SK 158 s*b 01 15 53.3588035416 -73 19 08.520075336 11.58 12.53 12.70 12.68   BC0Ia 28 0
15 WDG 1 s*b 01 41 42.0683863272 -73 50 38.183979624   11.86 11.84     B1.5Ia 64 0
16 HD 13854 s*b 02 16 51.7162480872 +57 03 18.882144756 6.10 6.76 6.48 6.14 5.95 B1Iab 213 0
17 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7084 0
18 HD 21291 s*b 03 29 04.1328896160 +59 56 25.201164588 4.40 4.63 4.22 3.84 3.46 B9Ia 290 0
19 * zet Per s*b 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 856 0
20 * bet Ori s*b 05 14 32.27210 -08 12 05.8981 -0.56 0.10 0.13 0.13 0.15 B8Iae 763 0
21 * kap Ori s*b 05 47 45.3888404 -09 40 10.577707 0.87 1.88 2.06 2.09 2.27 B0.5Ia 569 0
22 * chi02 Ori s*b 06 03 55.1843706432 +20 08 18.428141364 4.24 4.91 4.63 4.32 4.10 B2Ia 450 0
23 HD 193183 * 20 17 22.7627493456 +38 14 08.422560204   7.386 7.021     B1.5Ib 72 0
24 * 69 Cyg s*b 21 25 47.0250895464 +36 40 02.584183260 4.89 5.86 5.94     B0.2Iab 201 0
25 * 9 Cep Pu* 21 37 55.2241394424 +62 04 54.990376788 4.49 5.03 4.73 4.42 4.24 B2Ib 301 0
26 * 13 Cep V* 21 54 53.1538880928 +56 36 40.415024952 6.50 6.52 5.80 5.12 4.52 B8Ib 187 0

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