DISENTANGLING THE NATURE OF THE RADIO EMISSION IN WOLF-RAYET STARS

被引：20

作者：

Montes, Gabriela ^{[1
]}

Perez-Torres, Miguel A. ^{[1
]}

Alberdi, Antonio ^{[1
]}

Gonzalez, Ricardo F. ^{[2
]}

机构：

[1] CSIC, IAA, E-18008 Granada, Spain

[2] UNAM, Ctr Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 705卷 / 01期

关键词：

binaries: close; radio continuum: stars; stars:; individual; (WR; 98; WR; 133; 156); stars: Wolf-Rayet; WIND BINARY-SYSTEMS; MASS-LOSS RATES; CONTINUUM MEASUREMENTS; NONTHERMAL EMISSION; PINWHEEL NEBULA; STELLAR WINDS; SPECTRUM; MODELS;

D O I：

10.1088/0004-637X/705/1/899

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present quasi-simultaneous, multi-frequency Very Large Array observations at 4.8, 8.4, and 22.5 GHz of a sample of 13 Wolf-Rayet (WR) stars, aimed at disentangling the nature of their radio emission and the possible detection of a non-thermal behavior in close binary systems. We detected 12 stars from our sample, for which we derived spectral information and estimated their mass-loss rates. From our data, we identified four thermal sources (WR 89, 113, 138, and 141), and three sources with a composite spectrum ( similar contribution of thermal and non-thermal emission; WR 8, 98, and 156). On the other hand, from the comparison with previous observations, we confirm the non-thermal spectrum of one (WR 105), and also found evidence of a composite spectrum for WR 79a, 98a, 104, and 133. Finally, we discuss the possible scenarios to explain the nature of the emission for the observed objects.

引用

页码：899 / 906

页数：8