The Circumstellar Envelope of the Semiregular Variable Star V CVn
نویسندگان
چکیده
منابع مشابه
Nonlinear Properties of the Semiregular Variable Stars
We demonstrate how, with a purely empirical analysis of the irregular lightcurve data, one can extract a great deal of information about the stellar pulsation mechanism. An application to R Sct thus shows that the irregular lightcurve is the result of the nonlinear interaction of two highly nonadiabatic pulsation modes, namely a linearly unstable, low frequency mode, and the second mode that, a...
متن کاملThe new AM CVn star in Hydra
High speed photometry of the new AM CVn star in Hya (previously known as SN2003aw), spectroscopically identified by Chornock & Filippenko, shows it to have a superhump period of 2041.5 ± 0.3 s. We find a range of brightness from V ∼ 16.5 to 20.3, presumably caused by variations in the rate of mass transfer. In the intermediate state the system cycles in brightness with a period of ∼ 16 h and ra...
متن کاملThe warm circumstellar envelope and wind of the G 9 IIb star HR 6902
ASTRONOMY AND ASTROPHYSICS The warm circumstellar envelope and wind of the G9 IIb star HR 6902 Abstract. IUE observations of the eclipsing binary system HR 6902 obtained at various epochs spread over four years indicate the presence of warm circumstellar material enveloping the G9 IIb primary. The spectra show Si iv and C iv absorption up to a distance of 3.3 giant radii (R g). Line ratio diagn...
متن کاملOxygen Chemistry in the Circumstellar Envelope of the Carbon-rich Star Irc+10216
In this paper we study the oxygen chemistry in the C-rich circumstellar shells of IRC+10216. The recent discoveries of oxygen bearing species (water, hydroxyl radical and formaldehyde) toward this source challenge our current understanding of the chemistry in C-rich circumstellar envelopes. The presence of icy comets surrounding the star or catalysis on iron grain surfaces have been invoked to ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy Letters
سال: 2019
ISSN: 1063-7737,1562-6873
DOI: 10.1134/s1063773719070065