The most rapidly rotating He-strong emission line star: HR 7355

被引：0
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作者：
Rivinius, T. [1 ]
Tefl, S. [1 ]
Townsend, R.H.D. [2 ]
Baade, D. [3 ]
机构：
[1] ESO, European Organisation for Astronomical Research in the Southern Hemisphere, Chile
[2] Bartol Research Institute, University of Delaware, Newark, DE 19716, United States
[3] ESO, European Organisation for Astronomical Research in the Southern Hemisphere, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
来源：
Astronomy and Astrophysics | 2008年 / 482卷 / 01期
关键词：
Aims. We searched for massive stars with Balmer emission consistent with magnetically confined circumstellar material.Methods. Archival spectroscopic and photometric data were investigated.Results. HR 7355 is a formerly unknown He-strong star showing Balmer emission. At mag; it is one of the brightest objects simultaneously showing anomalous helium absorption and hydrogen emission. Among similar objects; only Ori E has so far been subjected to any systematic analysis of the circumstellar material responsible for the emission. We argue that the double-wave photometric period of 0.52 d corresponds to the rotation period. In tandem with the high projected equatorial velocity; sin = 320 km s; this short period suggests that HR 7355 is the most rapidly rotating He-strong star known to date; a class that was hitherto expected to host stars with slow to moderate rotation only. © 2008 ESO;
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页码：255 / 258
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