期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 493, 期 2, 页码 2511-2517出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa457
关键词
stars: early-type; stars: massive; stars: variable: general; stars: Be; X-rays: stars
资金
- Fonds National de la Recherche Scientifique (Belgium)
- European Space Agency (ESA)
- Belgian Federal Science Policy Office (BELSPO)
- DLR [50OR1605]
- ESA Member States
- USA (NASA)
- [ESP2017-85691-P]
In the last years, a peculiarity of some Be stars - their association with unusually hard and intense X-ray emission - was shown to extend beyond a mere few cases. In this paper, we continue our search for new cases by performing a limited survey of 18 Be stars using XMM-Newton. The targets were selected either on the basis of a previous X-ray detection (EXOSAT, ROSAT, XMM-slew survey) without spectral information available or because of the presence of a peculiar spectral variability. Only two targets remain undetected in the new observations and three other stars display only faint and soft X-rays. Short-term and/or long-term variations were found in one third of the sample. The spectral characterization of the X-ray brightest 13 stars of the sample led to the discovery of three new gamma Cas (HD44458, HD45995, and V558 Lyr), bringing the total to 25 known cases, and another gamma Cas candidate (HD 120678), bringing the total to two.
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