Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 731, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/731/1/L6
Keywords
stars: emission-line, Be; stars: individual (HD 157832); X-rays: stars
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Funding
- Brazilian agency FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo) [2009/06295-7, 2010/08341-3]
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We report the discovery with XMM-Newton of a hard-thermal (T similar to 130 MK) and variable X-ray emission from the Be star HD 157832, a new member of the puzzling class of gamma-Cas-like Be/X-ray systems. Recent optical spectroscopy reveals the presence of a large/dense circumstellar disk seen at intermediate/high inclination. With a B1.5V spectral type, HD 157832 is the coolest gamma-Cas analog known. In addition, its non-detection in the ROSAT all-sky survey shows that its average soft X-ray luminosity varied by a factor larger than similar to 3 over a time interval of 14 yr. These two remarkable features, low effective temperature, and likely high X-ray variability turn HD 157832 into a promising object for understanding the origin of the unusually high-temperature X-ray emission in these systems.
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