γ - Cas恒星:x射线发射的起源

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS
A. F. Kholtygin, E. B. Ryspaeva
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引用次数: 0

摘要

γ Cas型恒星是一组具有异常硬x射线发射的Be恒星,其x射线光度为LX ~ 1031-1033 erg/s,高于典型Be恒星,但低于含有Be成分的大质量x射线双星。x射线发射等离子体的温度达到10 - 20kev甚至更高,假设它们发射热x射线。为了验证这组恒星形成x射线的假设,分析了γ - Cas型恒星的x射线和光学发射的变异性。揭示了这类恒星的x射线亮度变化和H、He、FeII谱线变化的规律分量。光学和x射线的变化周期非常接近,与Be恒星的典型非径向脉动周期相对应。这表明,由于nrp, Be星的风结构发生了调制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

γ Cas Stars: The Origin of the X-ray Emission

γ Cas Stars: The Origin of the X-ray Emission

The γ Cas type stars are a group of Be stars with unusually hard X-ray emission and an X-ray luminosity of LX ~ 1031–1033 erg/s, which is higher than for typical Be stars but less than for massive X-ray binaries with Be components. The temperature of the X-ray emitting plasma reaches values of 10–20 keV or even more, assuming that they emit thermal X-rays. To test the hypotheses on the X-rays formation from this group of stars, the variability of the X-ray and optical emission of γ Cas type stars is analyzed. Regular components of X-ray brightness variations and H, He and FeII line profile variations in spectra of such stars are revealed. The periods of optical and X-ray variability are close and correspond to typical periods of non-radial pulsations (NRPs) of Be stars. That suggests modulation of the wind structure of a Be star as a result of NRPs.

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来源期刊
Geomagnetism and Aeronomy
Geomagnetism and Aeronomy Earth and Planetary Sciences-Space and Planetary Science
CiteScore
1.30
自引率
33.30%
发文量
65
审稿时长
4-8 weeks
期刊介绍: Geomagnetism and Aeronomy is a bimonthly periodical that covers the fields of interplanetary space; geoeffective solar events; the magnetosphere; the ionosphere; the upper and middle atmosphere; the action of solar variability and activity on atmospheric parameters and climate; the main magnetic field and its secular variations, excursion, and inversion; and other related topics.
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