PMO OpenIR  > 期刊(老文献)
THE BE STAR GAMMA CASSIOPEIAE - X-RAY, FAR-UV, AND OPTICAL OBSERVATIONS IN EARLY 1989
HORAGUCHI, T ; KOGURE, T ; HIRATA, R ; KAWAI, N ; MATSUOKA, M ; MURAKAMI, T ; DOAZAN, V ; SLETTEBAK, A ; HUANG, CC ; CAO, HL ; GUO, ZH ; HUANG, L ; TSUJITA, J ; OHSHIMA, O ; ITO, Y
1994
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
ISSN0004-6264
Volume46Issue:1Pages:92-6
AbstractThe state of gamma Cas in early 1989 is presented as the result of joint observations in the X-ray, far-UV, and optical regions, Particular attention has been paid to short- and long-term variations within these spectral ranges. In X-ray observations with the Ginga satellite we have found no specific periodic variabilities in the 64 to 13,000 s range, although a highly variable nature with no appreciable changes in the hardness ratios has been confirmed. The X-ray spectrum has been fitted with that of a thin thermal plasma (16-17 keV) with an iron emission line centered at 6.7 keV. For the resonance lines of Si IV, C IV, and N V observed with the IUE satellite in the far-UV region, no high-velocity narrow absorption components were detected. The presence of very broad wings in their profiles extending to expansion velocities (greater than or similar to 1,000 km s-1) much larger than the photospheric escape velocity provides evidence for the existence of high-velocity mass-loss processes from the star. The optical spectrum shows that gamma Cas is still in the state of V/R > 1 for Halpha, Hbeta, and Hgamma. A series of high-resolution, high-S/N, He I lambda4471 and Mg II lambda4481 line profiles indicates evidence of nonradial pulsation (\m\ congruent-to 8-10) of the star. The UBV photometric observations show that gamma Cas was in a rather stable state in early 1989, although some fluctuation was recorded on time scales of minutes and hours. We cannot find any correlation between the time variations of the X-ray and other wavelength regions. We discuss the X-ray characteristics of gamma Cas, which is uncommon among Be star X-ray sources regarding its spectral feature and variability.
Subject Area天文和天体物理
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8519
Collection期刊(老文献)
Recommended Citation
GB/T 7714
HORAGUCHI, T,KOGURE, T,HIRATA, R,et al. THE BE STAR GAMMA CASSIOPEIAE - X-RAY, FAR-UV, AND OPTICAL OBSERVATIONS IN EARLY 1989[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,1994,46(1):92-6.
APA HORAGUCHI, T.,KOGURE, T.,HIRATA, R.,KAWAI, N.,MATSUOKA, M.,...&ITO, Y.(1994).THE BE STAR GAMMA CASSIOPEIAE - X-RAY, FAR-UV, AND OPTICAL OBSERVATIONS IN EARLY 1989.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,46(1),92-6.
MLA HORAGUCHI, T,et al."THE BE STAR GAMMA CASSIOPEIAE - X-RAY, FAR-UV, AND OPTICAL OBSERVATIONS IN EARLY 1989".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 46.1(1994):92-6.
Files in This Item:
File Name/Size DocType Version Access License
1994015THE BE STAR G(454KB) 开放获取LicenseView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[HORAGUCHI, T]'s Articles
[KOGURE, T]'s Articles
[HIRATA, R]'s Articles
Baidu academic
Similar articles in Baidu academic
[HORAGUCHI, T]'s Articles
[KOGURE, T]'s Articles
[HIRATA, R]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[HORAGUCHI, T]'s Articles
[KOGURE, T]'s Articles
[HIRATA, R]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 1994015THE BE STAR GAMMA CASSIOPEIAE - X-RAY, FAR-UV, AND OPTICAL OBSERVATIONS IN EARLY 1989.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.