SIMBAD references

2018A&A...619A.148N - Astronomy and Astrophysics, volume 619A, 148-148 (2018/11-1)

Hot stars observed by XMM-Newton. II. A survey of Oe and Be stars.


Abstract (from CDS):

We perform a survey of Oe and Be stars in the X-ray range. To this aim, we cross-correlated XMM-Newton and Chandra catalogs of X-ray sources with a list of Be stars, finding 84 matches in total. Of these, 51 objects had enough counts for a spectral analysis. This paper provides the derived X-ray properties (X-ray luminosities, and whenever possible, hardness ratios, plasma temperatures, and variability assessment) of this largest ever sample of Oe and Be stars. The targets display a wide range in luminosity and hardness. In particular, the significant presence of very bright and hard sources is atypical for X-ray surveys of OB stars. Several types of sources are identified. A subset of stars display the typical characteristics of O-stars, magnetic OB stars, or pre-main-sequence (PMS) objects: their Be nature does not seem to play an important role. However, another subset comprises γ Cas analogs, which are responsible for the luminous and hard detections. Our sample contains seven known γ Cas analogs, but we also identify eight new γ Cas analogs and one γ Cas candidate. This nearly doubles the sample of such stars.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: early-type - stars: emission-line Be - X-rays: stars - stars: individual: γ Cas

VizieR on-line data: <Available at CDS (J/A+A/619/A148): table1.dat table2.dat table3.dat table4.dat table5.dat refs.dat>

Simbad objects: 105

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