The outburst properties of AM CVn stars
نویسندگان
چکیده
منابع مشابه
The outburst properties of AM CVn stars
We briefly summarize the observational properties of ultra-compact binaries called AM CVn stars. We analize their outbursts originating from the thermal-viscous instability in helium accretion disc. We present our preliminary results in applying the model of Dwarf Novae outbursts to helium discs. We can calculate models of outbursts of reasonable amplitude of 2 mag with a constant α parameter t...
متن کاملAM CVn stars
I review our observational and theoretical knowledge of AM CVn stars, focusing on recent developments. These include newly discovered systems, the possibility that two recently discovered extremely short period objects are AM CVn stars and an update on X-ray, UV an optical studies. Theoretical advances include the study of the details of both the donor and accretor, and the physics of the heliu...
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High speed photometry of the helium-transferring binary ES Cet – taken over a two-year period (2001 October – 2003 October) – shows a very stable photometric period of 620.211437 ± 0.000038 s, with a tentative indication of curvature in the O–C diagram suggesting a change in period at a rate of Ṗ ∼ 1.6×10 . Phase-resolved spectroscopy of ES Cet obtained with the Hobby-Eberly Telescope shows a c...
متن کاملHst/fgs Parallaxes of Am Cvn Stars and Astrophysical Consequences
We present absolute parallaxes and relative proper motions for five AM CVn stars, which we obtained using the Fine Guidance Sensors on board the Hubble Space Telescope. Our parallax measurements translate into distances dAMCVn = 606 +135 −93 pc; dHPLib = 197 +14 −12 pc; dCRBoo = 337 +44 −35 pc; dV803Cen = 347 +32 −27 pc; and dGPCom = 75 +2 −2 pc. From these distances we estimate the space densi...
متن کاملThe population of AM CVn stars from the Sloan Digital Sky Survey
The AM Canum Venaticorum stars are rare interacting white dwarf binaries, whose formation and evolution are still poorly known. The Sloan Digital Sky Survey provides, for the first time, a sample of 6 AM CVn stars (out of a total population of 18) that is sufficiently homogeneous that we can start to study the population in some detail. We use the Sloan sample to ‘calibrate’ theoretical populat...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 2010
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.200911333