The most rapidly rotating He-strong emission line star: HR7355
arXiv:0801.4328 · doi:10.1051/0004-6361:20078547
Abstract
Using archival spectroscopic and photometric data, we searched for massive stars with Balmer-emission consistent with magnetically confined circumstellar material. HR 7355 is a formerly unknown He-strong star showing Balmer emission. At V=6.02 mag, it is one of the brightest objects simultaneously showing anomalous helium absorption and hydrogen emission. Among similar objects, only sigma 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 0.52d corresponds to the rotation period. In tandem with the high projected equatorial velocity, v sin i=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.
arXiv comment4 pages with 2 figures. Accepted for publication as Research Note by Astronomy and Astrophysics
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- Magnetic field detection in the B2Vn star HR 7355
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- An infrared diagnostic for magnetism in hot stars
- HR 7355 - another rapidly braking He-strong CP star?
- Characterizing the Rigidly Rotating Magnetosphere Stars HD 345439 and HD 23478
- Electron Scattering Emission in the Light Curves of Stars with Centrifugal Magnetospheres
- News from Gaia on sigma Ori E: a case study for the wind magnetic braking process
- Photometric properties and stellar parameters of the rapidly rotating magnetic early-B star HD 345439
- MOBSTER -- VII. Using light curves to infer magnetic and rotational properties of stars with centrifugal magnetospheres
- Discovery of a strong magnetic field in the rapidly rotating B2Vn star HR 7355