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


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.24CEST00:16:29

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

goto Full paper

goto View the reference in ADS

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 - 2019
#notes
1 * kap Cas s*b 00 32 59.9911963 +62 55 54.417374 3.50 4.30 4.16 4.02 3.96 B1Ia 443 0
2 SK 13 s*b 00 47 12.2161275650 -73 06 33.114896034   12.52 12.48     B2.5Ia 66 0
3 BBB SMC 259 s*b 00 47 38.7402682564 -73 07 48.852687037   12.15 12.25     B5Ia 29 0
4 HD 5045 s*b 00 50 38.3869614887 -73 28 18.256656417   10.76 10.8     B1.5Ia+ 73 0
5 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9092 1
6 SK 73 s*b 00 58 35.7845024129 -72 16 25.021114826 11.73 12.63 12.66   12.69 B2Ia 26 0
7 SK 76 s*b 00 58 55.6261672908 -72 32 08.470311732 11.64 12.65 12.75   12.84 BN0Ia 39 0
8 RMC 18 s*b 01 00 06.8833640311 -72 13 57.373993872   11.7 11.5     B1Ia 61 0
9 RMC 25 s*b 01 02 21.4892494359 -72 00 17.599429306 11.753 12.704 12.836   12.69 B1.5Iab 18 0
10 RMC 36 s*b 01 04 49.3496844150 -72 06 21.744673104 10.57 11.37 11.38     B3Ia 47 0
11 AzV 374 * 01 05 01.8631751346 -72 26 53.787763303 12.04 12.96 13.10   13.224 B2Ib 14 0
12 SK 145 s*b 01 11 25.9165264050 -72 31 21.277198421 11.463 12.464 12.596   11.60 B2.5Ia 32 0
13 SK 150 s*b 01 13 01.8746841972 -72 45 48.446726311 11.593 12.564 12.676   11.42 B2Ia 24 0
14 SK 158 s*b 01 15 53.3577272528 -73 19 08.519855063 11.58 12.53 12.70 12.68   BC0Ia 27 0
15 WDG 1 s*b 01 41 42.0688016266 -73 50 38.187131393   11.86 11.84     B1.5Ia 55 0
16 HD 13854 s*b 02 16 51.7161542593 +57 03 18.880915822 6.10 6.76 6.48 6.14 5.95 B1Iab 202 0
17 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
18 HD 21291 s*b 03 29 04.1289203454 +59 56 25.213264523 4.40 4.63 4.22 3.84 3.46 B9Ia 279 1
19 * zet Per V* 03 54 07.9224751 +31 53 01.081262 2.19 2.97 2.85 2.71 2.62 B1Ib 809 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 725 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 545 0
22 * chi02 Ori s*b 06 03 55.1848402263 +20 08 18.441609669 4.24 4.91 4.63 4.32 4.10 B2Ia 425 0
23 HD 193183 * 20 17 22.7634891545 +38 14 08.432519250   7.386 7.021     B1.5Ib 64 0
24 * 69 Cyg Pu* 21 25 47.0250425121 +36 40 02.585147081 4.89 5.86 5.94     B0Ib 189 0
25 * 9 Cep Pu* 21 37 55.2235288899 +62 04 54.993364177 4.49 5.03 4.73 4.42 4.24 B2Ib 286 0
26 * 13 Cep V* 21 54 53.1538674561 +56 36 40.407476918 6.50 6.52 5.80 5.12 4.52 B8Ib 173 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2006A&A...451..603D and select 'bookmark this link' or equivalent in the popup menu


2019.10.24-00:16:29

© Université de Strasbourg/CNRS

    • Contact