Observations of the Variable Star S Ursae Majoris. R.A. xii. 39.7; Dec. 61 41' 8 N
نویسندگان
چکیده
منابع مشابه
Infrared Observations of AR Ursae Majoris: Modeling the Ellipsoidal Variations
We have obtained time-series infrared photometry for the highly magnetic cataclysmic variable AR UMa. Our J and K’ band observations occurred during a low state and they show a distinctive double-humped structure. Using detailed models for the expected ellipsoidal variations in the infrared due to the non-spherical secondary star, we find that the most likely value for the system inclination is...
متن کاملRecovery of 29-s Oscillations in HST/FOS Eclipse Observations of the Cataclysmic Variable UX Ursae Majoris
Low amplitude (≃ 0.5%) 29-s oscillations have been detected in HST/FOS eclipse observations of the nova-like cataclysmic variable UX UMa. These are the same dwarf nova-type oscillations that were originally discovered in this system by Warner & Nather in 1972. The 29-s oscillations are seen in one pair of eclipse sequences obtained with the FOS/PRISM in November of 1994, but not in a similar pa...
متن کاملHST/FOS Eclipse Observations of the Nova-like Cataclysmic Variable UX Ursae Majoris
We present and analyze Hubble Space Telescope observations of the eclipsing nova-like cataclysmic variable UX UMa obtained with the Faint Object Spectrograph. Two eclipses each were observed with the G160L grating (covering the ultraviolet waveband) in August of 1994 and with the PRISM (covering the near-ultraviolet to near-infrared) in November of the same year. The system was ∼50% brighter in...
متن کاملThe dynamical stability of W Ursae Majoris-type systems
Theoretical study indicates that a contact binary system would merge into a rapidly rotating single star due to tidal instability when the spin angular momentum of the system is more than a third of its orbital angular momentum. Assuming that W UMa contact binary systems rigorously comply with the Roche geometry and the dynamical stability limit is at a contact degree of about 70%, we obtain th...
متن کاملSimultaneous X-Ray and Optical Observations of AN Ursae Majoris during a Low State
X-ray observations throughout the orbital cycle of AN UMa during its low state were conducted with the Einstein Observatory simultaneously with ground-based optical UBV photometry and spectroscopy. The observed low X-ray flux of 7X 10-l3 ergs cm-2 s-I is a factor of 40 below the high-state X-ray flux, and FX/Fqt is about a factor of 50 lower than for AM Her and 2A 031 1-227. There is marginal e...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1893
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/53.3.127