2004ApJ...610.1021E

Query : 2004ApJ...610.1021E

2004ApJ...610.1021E - Astrophys. J., 610, 1021-1037 (2004/August-1)

Quantitative studies of the far-ultraviolet, ultraviolet, and optical spectra of late O- and early B-type supergiants in the Magellanic clouds.

EVANS C.J., CROWTHER P.A., FULLERTON A.W. and HILLIER D.J.

Abstract (from CDS):

We present quantitative studies of eight late O- and early B-type supergiants in the Magellanic Clouds using far-ultraviolet Far Ultraviolet Spectroscopic Explorer, ultraviolet International Ultraviolet Explorer/Hubble Space Telescope, and optical VLT-UVES spectroscopy. Temperatures, mass-loss rates, and CNO abundances are obtained using the non-LTE, spherical, line-blanketed model atmosphere code of Hillier & Miller. We support recent results for lower temperatures of OB-type supergiants as a result of stellar winds and blanketing, which amounts to ∼2000 K at B0 Ia. In general, Hα-derived mass-loss rates are consistent with UV and far-UV spectroscopy, although from consideration of the S IV λλ1063, 1073 doublet, clumped winds are preferred over homogenous models. AV 235 (B0 Iaw) is a notable exception, which has an unusually strong Hα profile that is inconsistent with the other Balmer lines and UV wind diagnostics. We also derive CNO abundances for our sample, revealing substantial nitrogen enrichment, with carbon and oxygen depletion. Our results are supported by comparison with the Galactic supergiant HD 2905 (BC0.7 Ia) for which near-solar CNO abundances are obtained. This bolsters previous suggestions that ``normal'' OB-type supergiants exhibit atmospheric compositions indicative of partial CNO processing.

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Journal keyword(s): Stars: Early-Type - Stars: Fundamental Parameters - Stars: Mass Loss - Ultraviolet: Stars

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ass Cas OB 14 As* 00 29 +63.5           ~ 34 0
2 * kap Cas s*b 00 32 59.9918836206 +62 55 54.413126128 3.50 4.30 4.16 4.02 3.96 BC0.7Ia 474 0
3 BBB SMC 1 * 00 50 17.2067283312 -72 53 30.259838832 12.093 13.144 13.326 13.39 13.47 OC7III 52 0
4 SK 35 s*b 00 50 18.1229621664 -72 38 10.034313252 11.04 10.96 12.40   12.12 O9.5Iab 48 0
5 AzV 83 s*b 00 50 52.0015192368 -72 42 14.940550980 12.233 13.244 13.366   13.67 O7Iaf 58 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
7 RMC 17 s*b 00 59 45.7300850520 -72 44 56.416111080   12.02 12.2     B0Ia 70 0
8 SK 116 s*b 01 04 55.7398901040 -72 46 48.146591280 11.413 12.494 12.646     O9.2Iab 43 0
9 SK 143 s*b 01 10 55.7567270880 -72 42 56.223094032 12.15 12.98 12.89 12.78 11.64 O9.7Ib 91 0
10 SK 148 s*b 01 12 29.0077488048 -72 29 29.054516928 11.913 13.014 13.176   13.32 O9Iab(f) 48 0
11 SK 159 s*b 01 15 58.8782034384 -73 21 24.351532740 10.80 11.77 11.90     B0.2Ia 84 0
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
13 HD 269050 s*b 05 07 20.4218668824 -68 32 08.569322196 10.593 11.581 11.54 11.46 11.55 B0Ia(e?) 89 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
15 HD 269858 s*b 05 36 43.6936418088 -69 29 47.451149232   10.24 10.15 9.95 9.05 LBV 296 2
16 SK -66 169 s*b 05 36 54.6614083464 -66 38 22.427577744   12.43 12.56     O9.7Ia+ 37 0
17 HD 269896 s*b 05 37 49.1356176384 -68 55 01.639049016 11.338 9.493 11.449 11.49   ON9.7Ia+ 102 0
18 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
19 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 790 0

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