2004ApJ...617.1316P

Query : 2004ApJ...617.1316P

2004ApJ...617.1316P - Astrophys. J., 617, 1316-1322 (2004/December-3)

Effects of metallicity on the rotational velocities of massive stars.

PENNY L.R., SPRAGUE A.J., SEAGO G. and GIES D.R.

Abstract (from CDS):

Recent theoretical predictions for low-metallicity massive stars predict that these stars should have drastically reduced equatorial winds (mass loss) while on the main sequence, and so should retain most of their angular momentum. Observations of both the Be/(B+Be) ratio and the blue-to-red supergiant ratio appear to have a metallicity dependence that may be caused by high rotational velocities. We have analyzed 39 archival Hubble Space Telescope Imaging Spectrograph (STIS), high-resolution, ultraviolet spectra of O-type stars in the Magellanic Clouds to determine their projected rotational velocities Vsini. Our methodology is based on a previous study of the projected rotational velocities of Galactic O-type stars using International Ultraviolet Explorer (IUE) short-wavelength prime (SWP) camera high-dispersion spectra, which resulted in a catalog of Vsini values for 177 O-type stars. Here we present complementary Vsini values for 21 Large Magellanic Cloud and 22 Small Magellanic Cloud O-type stars based on STIS and IUE UV spectroscopy. The distribution of Vsini values for O-type stars in the Magellanic Clouds is compared to that of Galactic O-type stars. Despite the theoretical predictions and indirect observational evidence for high rotation, the O-type stars in the Magellanic Clouds do not appear to rotate faster than their Galactic counterparts.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Magellanic Clouds - Stars: Early-Type - Stars: Rotation - Ultraviolet: Stars

Simbad objects: 62

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Number of rows : 62
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 SK 10 s*b 00 46 42.1591125672 -73 24 55.494317340 11.903 12.984 13.176   13.35 O6.5I(f) 45 0
2 BBB SMC 266 s*b 00 47 50.0484011088 -73 08 21.054056928   12.35 12.55 12.36   O6I(f) 69 0
3 AzV 47 * 00 48 51.4911440520 -73 25 58.537753356 12.263 13.314 13.496   14.00 O8III 35 0
4 BBB SMC 1 * 00 50 17.2067283312 -72 53 30.259838832 12.093 13.144 13.326 13.39 13.47 OC7.5III((f)) 43 0
5 LIN 156 s*b 00 50 32.4050818488 -72 52 36.441355908 11.553 12.604 12.756   12.89 O5.5I(f) 50 0
6 AzV 80 * 00 50 43.8139294080 -72 47 41.547243120 12.22 13.24 13.376   13.59 O4-6n(f)p 31 0
7 AzV 83 s*b 00 50 52.0015192368 -72 42 14.940550980 12.233 13.244 13.366   13.67 O7Iaf+ 47 0
8 AzV 95 * 00 51 21.6002057448 -72 44 14.875230300 12.67 13.64 13.83   13.95 O7III((f)) 40 0
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11149 1
10 AzV 170 s*b 00 55 42.4299731736 -73 17 30.523500780 12.86 13.82 14.11   14.25 O9.7I 30 0
11 Cl* NGC 346 MPG 12 * 00 58 14.0865065520 -72 10 44.292892764   19.15 17.98   16.72 B0IV(Nstr) 32 0
12 Cl* NGC 346 ELS 28 * 00 58 31.7543622456 -72 10 57.965696544 13.58 14.73 14.94   15.23 OC6Vz 27 0
13 Cl* NGC 346 ELS 7 * 00 58 57.3961905528 -72 10 33.660822720 12.68 13.82 14.13   14.28 O4V((f+)) 52 0
14 Cl* NGC 346 W 3 * 00 59 00.7591806336 -72 10 28.171806492 11.46 12.61 12.80   13.63 O2III(f) 62 0
15 Cl* NGC 346 NMC 28 * 00 59 01.8187292184 -72 10 31.216864152   13.95 14.18     O5.5V((f+)) 31 0
16 Cl* NGC 346 NMC 17 * 00 59 06.7498587648 -72 10 41.262204828 13.05 14.19 14.33   14.60 O8V 21 0
17 AzV 220 Em* 00 59 09.9690896976 -72 05 48.278525460 13.13 14.24 14.51   14.73 O7If 35 0
18 Cl* NGC 346 ELS 22 * 00 59 18.6176208672 -72 11 09.887619084   14.65 14.91     O9V 20 0
19 SK 80 s*b 00 59 31.9751731656 -72 10 46.106730444   12.12 12.31     O7Iaf+ 108 0
20 SK 84 * 01 00 06.7253852112 -72 47 19.124459916 12.58 13.71 13.91   14.16 O6V 43 0
21 RMC 28 s*b 01 03 10.5480205584 -72 02 14.335031256 11.833 12.924 13.086   13.60 O9.7I 41 0
22 AzV 388 * 01 05 39.5306276568 -72 29 26.938329540 12.79 13.86 14.12   14.37 O5V 42 0
23 SK 132 s*b 01 07 40.3905611664 -72 51 00.061708428 12.08 13.13 13.31 13.30 13.45 O9.5II(n) 42 0
24 HD 12323 SB* 02 02 30.1268458032 +55 37 26.372271540 7.95 8.87 8.92     ON9.2V 184 0
25 HD 13268 * 02 11 29.7003301008 +56 09 31.721738760 7.48 8.24 8.18     ON8.5IIIn 179 0
26 HD 13745 bC* 02 15 45.9350391312 +55 59 46.727495484 7.22 7.99 7.90     O9.7II(n) 172 1
27 HD 14434 Em* 02 21 52.4121560832 +56 54 18.032028876 7.87 8.65 8.49 8.29 8.20 O5.5Vnn((f))p 187 0
28 HD 268605 s*b 04 50 18.9258130824 -67 39 38.036838240 10.244 11.2 11.377   11.322 O9.5/B0Ia 86 0
29 HD 270952 WR* 05 01 23.0763876936 -65 52 33.206008764 10.944 11.871 12.07   12.187 O6Iaf+ 54 0
30 NGC 1850A Cl* 05 08 39.39 -68 45 43.4           ~ 25 3
31 NGC 1850 Cl* 05 08 50.190 -68 45 35.65   8.84 8.96     ~ 273 1
32 SK -67 51 * 05 09 47.3476521408 -67 53 57.916114656 11.528 12.483 12.682   12.764 OB 9 0
33 V* AE Aur Or* 05 16 18.1493304816 +34 18 44.344404000 5.48 6.18 5.96     O9.5V 564 1
34 HD 269357 * 05 18 59.4790204920 -69 12 54.801550908   11.89 12.10     O6Ib(f) 55 0
35 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17434 0
36 SK -67 101 * 05 25 56.2422042240 -67 30 28.813234608   12.46 12.63     O8II((f)) 33 1
37 HD 269525 * 05 26 15.2190917352 -67 29 59.904231972   11.564 11.758 12.126   B0I 26 0
38 SK -67 107 * 05 26 20.6747956344 -67 29 55.652908164   12.38 12.50     B0I 18 0
39 SK -67 111 s*b 05 26 48.0782169672 -67 29 29.782796892   12.33 12.42     O6Iaf(n)pv 46 0
40 [L72] LH 58-19 * 05 27.0 -68 50   9.854 9.896     ~ 4 0
41 SK -66 100 * 05 27 45.4472444328 -66 55 15.293259480 12.227 12.976 13.204   13.501 O6II(f) 44 0
42 HD 269676 ** 05 31 15.634248 -71 04 09.90516 11.134 11.417 11.547 12.061 12.191 O6+O9: 82 0
43 HD 269698 s*b 05 31 44.2080798984 -67 38 01.374839556 9.520 12.00 12.22 12.47 11.167 O4Ia 111 0
44 HD 269810 Em* 05 35 13.8977747136 -67 33 27.542449260   12.08 12.22 12.53   O3III(f*) 106 0
45 SK -69 212 s*b 05 36 06.3756336288 -69 11 47.539993668   12.401 12.416 12.27 12.337 O6If 15 0
46 SK -66 169 s*b 05 36 54.6614083464 -66 38 22.427577744   12.43 12.56     O9.7Ia+ 33 0
47 SK -66 172 * 05 37 05.3893162560 -66 21 34.989059484   13.01 13.1     OB 41 0
48 HD 269896 s*b 05 37 49.1356176384 -68 55 01.639049016 11.338 9.493 11.449 11.49   ON9.7Ia+ 86 0
49 LHA 120-S 61 WR* 05 45 51.9388258704 -67 14 25.937264544 10.870 11.86 11.95 12.09 11.931 WN11h 86 0
50 HD 54662 SB* 07 09 20.2493151288 -10 20 47.635088964 5.35 6.24 6.21 7.23   O6.5Vz(n)+O7.5Vz 340 2
51 HD 57682 * 07 22 02.0546074728 -08 58 45.766323408 5.20 6.24 6.43     O9.2IV 257 0
52 HD 63005 * 07 45 49.0332176232 -26 29 31.436407572 8.29 9.12 9.13 9.64   O5/6 83 0
53 HD 91651 bC* 10 33 30.2993151816 -60 07 40.044178344 7.96 9.64 9.52 9.51   ON9.5IIIn 103 0
54 HD 92554 * 10 39 45.6466685664 -60 54 39.583812024 8.77 10.24 10.15 9.82   O9/B0 78 1
55 HD 308813 SB* 11 37 58.4451890256 -63 18 59.455147284 8.46 9.68 9.73 9.74   O9.7IV(n) 82 0
56 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 920 0
57 V* V1297 Sco SB* 16 56 05.2157203176 -40 20 57.576260184 7.87 9.11 9.29 9.29   O7.5Vz 138 0
58 HD 156359 s*b 17 21 18.7290160512 -62 55 05.378303532 8.55 9.52 9.72     B0Ia 82 0
59 HD 168941 * 18 23 25.5605003784 -26 57 10.844087076 8.53 9.36 9.37 9.81   O9.5IVp 102 0
60 HD 210809 s*b 22 11 38.6004719208 +52 25 47.950615308 6.7 7.61 7.56     O9Iab 214 0
61 [L72] LH 58-52 * ~ ~           ~ 3 0
62 [L72] LH 10-3120 * ~ ~           ~ 1 0

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