منابع مشابه
Unusual Phase Reversal of Superhumps in ER Ursae Majoris
We studied the evolution of superhumps in the peculiar SU UMa-type dwarf nova, ER UMa. Contrary to the canonical picture of the SU UMa-type superhump phenomena, the superhumps of ER UMa show an unexpected phase reversal during the very early stage (∼5 d after the superoutburst maximum). We interpret that a sudden switch to so-called late superhumps occurs during the very early stage of a supero...
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 کاملPhotometry and Spectroscopy of KS Ursae Majoris during Superoutburst
We report photometric and spectroscopic observations of the SU UMa-type dwarf novae, KS Ursae Majoris, during its 2003 February superoutburst. Modulations with a period of 0.07017 ± 0.00021 day, which is 3.3% larger than the orbital period, have been found during the superoutburst and may be positive superhumps. A maximum trough-to-peak amplitude of around 0.3 magnitude is determined for this s...
متن کاملAccretion Disc Evolution in DW Ursae Majoris: A Photometric Study
We present an analysis of CCD photometric observations of the eclipsing novalike cataclysmic variable DW UMa obtained in two different luminosity states: high and intermediate. The star presents eclipses with very different depth: ∼ 1.2 mag in the high and ∼ 3.4 mag in the intermediate state. Eclipse mapping reveals that this difference is almost entirely due to the changes in the accretion dis...
متن کاملInfrared 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...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1909
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19091821907