A model of the circumstellar envelope of luminous blue variables

doi:10.1088/1009-9271/5/3/004

YNAO OpenIR > 恒星物理研究组

	A model of the circumstellar envelope of luminous blue variables
	Guo JH(郭建恒)1,2 ; Li Y(李焱)1 ; Dan HG(单红光)1 ; Guo, JH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
发表期刊	CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS
	2005
卷号	5 期号:3 页码:245-255
DOI	10.1088/1009-9271/5/3/004
产权排序	第1完成单位
收录类别	SCI
关键词	Stars : Variables : Lbvs Stars : Continuum Spectrum Stars : Mass Loss
摘要	The continuum energy distributions of the luminous blue variables 8127 and 8110 in the outburst phase are fitted with a circumstellar envelope model. Both stars show two peaks in their continuum, one near 1250 angstrom and the other in the optical band. We suggest that their UV and optical fluxes may have different origins: the UV flux comes from the central star while the optical flux comes from an expanding circumstellar envelope. We construct a model for LBVs consisting of two LTE atmosphere models with different temperatures, and find it to be in agreement with the observed spectral energy distributions of R127 and R110. According to our numerical experiments, R127's continuum is composed of fluxes from a circumstellar envelope of T-eff = 8000 K, R = 485R(circle dot), and log g = 1, and from a central star of T-eff = 17000K, R = 135R(circle dot), and log g = 2.5 with a permeating factor f = 0.5; while R110's continuum can be fitted by a circumstellar envelope of T-eff = 17000K, R = 350R(circle dot), and log g = 0.5, and a central star of T-eff = 25 000 K, R = 27R(circle dot), and log g = 3.0 with a permeating factor f = 0.65. Both models show that the non-spherically symmetric, optically thick regions are formed surrounding the central star in the outburst phase. The light of the central star is shielded by the circumstellar envelope so that the visual brightness increases with the decrease/increase of the temperature/radius of the optically thick regions.
语种	英语
学科领域	Astronomy & Astrophysics
文章类型	Article
ISSN	1009-9271
URL	查看原文
归档日期	2006-07-25
WOS记录号	WOS:000230099500004
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
关键词[WOS]	LARGE MAGELLANIC CLOUD ; S-DORADUS VARIABLES ; EARLY-TYPE STARS ; AG-CARINAE ; STELLAR WIND ; MASS-LOSS ; VARIABILITY ; INTERMEDIATE ; EXTINCTION ; PHOTOMETRY
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ynao.ac.cn/handle/114a53/5178
专题	恒星物理研究组
通讯作者	Guo, JH (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位	1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011 2.Graduate School of Chinese Academy of Sciences, Beijing 100039
第一作者单位	中国科学院云南天文台
推荐引用方式 GB/T 7714	Guo JH,Li Y,Dan HG,et al. A model of the circumstellar envelope of luminous blue variables[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2005,5(3):245-255.
APA	Guo JH,Li Y,Dan HG,&Guo, JH .(2005).A model of the circumstellar envelope of luminous blue variables.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,5(3),245-255.
MLA	Guo JH,et al."A model of the circumstellar envelope of luminous blue variables".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 5.3(2005):245-255.

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A Model of the Circu（194KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	浏览请求全文