OPTICAL-EMISSION ENHANCEMENTS IN BE STARS

被引：13

作者：

APPARAO, KMV

机构：

[1] Department of Astronomy, Pennsylvania State University, 525 Davey Laboratory, University Park

[2] Tata Inst. of Fundamental Research, Bombay

来源：

ASTROPHYSICAL JOURNAL | 1991年 / 376卷 / 01期

关键词：

STARS; BE; X-RAYS; BINARIES;

D O I：

10.1086/170274

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Be stars show enhancement of optical emission up to a few magnitudes. Optical continuum enhancements due to (1) conversion of Lyman continuum photons of the Be star to visual photons in the envelope of the Be star, (2) emission from the H ii region formed by X-ray and extreme ultraviolet emission from a compact object in binary motion around the Be star, and (3) emission from an accretion disk around the compact object are considered. These considerations indicate that large increases of optical emission (greater-than-or-equal-to 0.5 mag) would need an ionizing source other than the Be star - for example, an accreting compact object emitting radiation. Specific examples of large increases of optical emission as in the sources-gamma Cas and 4U 0115 + 63 are discussed.

引用

页码：256 / 259

页数：4

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