THEORETICAL MODELING OF GHRS OBSERVATIONS OF THE OF/WN-TYPE STAR-R136A5

被引：9

作者：

DEKOTER, A

HUBENY, I

HEAP, SR

LANZ, T

机构：

[1] NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771

[2] NASA,GODDARD SPACE FLIGHT CTR,SWISS NATL SCI FDN,GREENBELT,MD 20771

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 435卷 / 01期

关键词：

STARS; ATMOSPHERES; EARLY-TYPE; INDIVIDUAL; (R136A5; MELNICK-42); MASS-LOSS; ULTRAVIOLET;

D O I：

10.1086/187597

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a theoretical analysis of the HST GHRS spectrum of R136a5, an O3f/WN star in the R136a cluster in 30 Doradus. Using non-LTE extended and expanding model atmospheres, we find a surprisingly high mass-loss rate M = 1.8 +/- 0.5 x 10(-5) M. yr-1 and an effective temperature T(eff) = 42.5 +/- 2.5 kK. With the observed visual magnitude, this implies a radius R* 17 +/- 2 R. and a luminosity L = 8.5 +/- 1 x 10(5) L.. We discuss possible sources of the uncertainties in the derived stellar parameters and conclude that the effective temperature may be underestimated; however, if so, the value of the mass-loss rate would not be affected.

引用

页码：L71 / L74

页数：4

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