G25.5+0.2 - A NEW LUMINOUS BLUE VARIABLE IN THE GALAXY

被引：18

作者：

SUBRAHMANYAN, R

EKERS, RD

WILSON, WE

GOSS, WM

ALLEN, DA

机构：

[1] NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801

[2] ANGLO AUSTRALIAN OBSERV,EPPING,NSW 2121,AUSTRALIA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1993年 / 263卷 / 04期

关键词：

STARS; VARIABLES; OTHER; H-II REGIONS; ISM; INDIVIDUAL; G25.5+0.2; JETS AND OUTFLOWS; RADIO LINES;

D O I：

10.1093/mnras/263.4.868

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the Australia Telescope, the Galactic source G25.5 + 0.2 has been detected in broad H105alpha and H106alpha radio recombination lines. Subsequent observations with the Very Large Array detected the H92alpha transition. The width of the recombination line is about 200 km s-1, attributed to large-scale velocity structure. Infrared imaging and spectroscopy with the Anglo-Australian Telescope reveals a luminous central star with an absolute magnitude of M(K) is similar to -7 that is at least as hot as an O7 main-sequence star. The object is not a supernova remnant as was previously suggested. We interpret G25.5 + 0.2 as an unusually energetic ejection associated with a post-main-sequence star of very high mass. The exceptional thermal bremsstrahlung emission from the nebula is due to photoionization by the high Lyman continuum flux of the central star.

引用

页码：868 / 874

页数：7