منابع مشابه
WZ Sagittae as a DQ Herculis star
We argue that quiescent WZ Sge is a rapidly spinning magnetic rotator in which most of the matter transfered from the secondary is ejected from the system. Assuming that the observed 27.87 s oscillation period is due to the spinning white dwarf we propose that the other observed principal period of 28.96 s is a beat due to reprocessing of the rotating white dwarf beam on plasma blobs in Kepleri...
متن کاملEUVE J0425.6–5714: A Newly Discovered AM Herculis Star
We detected a new AM Her star serendipitously in a 25 day observation with the EUVE satellite. A coherent period of 85.82 min is present in the EUVE Deep Survey imager light curve of this source. A spectroscopic optical identification is made with a 19th magnitude blue star that has H and He emission lines, and broad cyclotron humps typical of a magnetic cataclysmic variable. A lower limit to t...
متن کاملDissecting the donor star in the eclipsing polar HU Aquarii
Medium-resolution spectroscopic observations with full phase coverage of the eclipsing polar HU Aqr are presented. Na i absorption and Ca ii emission lines are used to trace the secondary star. While the Na i lines seem to have contributions from both hemispheres of the donor star, the Ca ii lines were found to originate from the irradiated part of its surface alone. An irradiation model was ap...
متن کاملParameters for the Eclipsing B - star Binary HD 42401
I present results from an optical spectroscopic investigation of the binary system HD 42401 (V1388 Ori; B2.5 IV-V + B3 V). A combined analysis of V−band photometry and radial velocities indicates that the system has an orbital period of 2.18706 ± 0.00005 days and an inclination of 75.5 ± 0.2 degrees. This solution yields masses and radii of M1 = 7.42 ± 0.08 M⊙ and R1 = 5.60 ± 0.04 R⊙ for the pr...
متن کاملApsidal Motion Determination of the Eclipsing Binary Star V459 Cassiopeiae
Photometric and spectroscopic observations and analysis of the eccentric eclipsing binary V459 Cassiopeiae (e = 0.0244) were performed by Lacy et al. (2004). Observations of minimum light show the presence of apsidal motion. In order to find the observed rate of apsidal motion, I followed the procedure described by Guinan & Maloney (1985). A new observed rate of apsidal motion of 15◦.2/100 yr w...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1951
ISSN: 0004-6256
DOI: 10.1086/106610