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Titolo: NLTE accretion disc models for the AM Canum Venaticorum systems
Autore: Nasser, MR; Solheim, JE; Semionoff, DA;
- Indirizzi:
- Univ Tromso, Dept Phys, N-9037 Tromso, Norway Univ Tromso Tromso Norway N-9037 romso, Dept Phys, N-9037 Tromso, Norway Inst Theoret Phys & Astron, LT-2600 Vilnius, Lithuania Inst Theoret Phys &Astron Vilnius Lithuania LT-2600 Vilnius, Lithuania
- Titolo Testata:
- ASTRONOMY & ASTROPHYSICS
fascicolo: 1,
volume: 373,
anno: 2001,
pagine: 222 - 235
- SICI:
- 1432-0746(200107)373:1<222:NADMFT>2.0.ZU;2-G
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- EARTH TELESCOPE OBSERVATIONS; HZ 29; STARS; CVN; SPECTROSCOPY; VARIABLES; BINARIES; PERIOD;
- Keywords:
- stars : novae, cataclysmic variables; accretion discs; individual : AM CVn, HP Lib, V803 Cen, CR Boo;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 39
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Nasser, MR Univ Tromso, Dept Phys, N-9037 Tromso, Norway Univ Tromso Tromso Norway N-9037 Phys, N-9037 Tromso, Norway
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- Citazione:
- M.R. Nasser et al., "NLTE accretion disc models for the AM Canum Venaticorum systems", ASTRON ASTR, 373(1), 2001, pp. 222-235
Abstract
We present models of the optical spectra of two types of accretion disc atmospheres: a pure helium model and a H-He model, in a low mass ratio, helium transferring, interacting binary white dwarf system. The computations arerestricted to stationary discs in LTE and NLTE cases. We also investigate the influence on the spectra of some of the disc parameters such as the mass accretion rate, the angle of inclination, the H/He mass ratio, and the inner and outer radius of the disc. Departures from LTE are also investigatedin order to assess the necessity of computing more complicated and more time consuming models. We found that differences in predicted equivalent widths of helium line computed in LTE and NLTE models range between 10 and 40 percent. Finally we compare our disc models with 4 of the AM CVn systems observed with the Nordic Optical Telescope: AM CVn, HP Lib, V803 Cen and CR Boo to determine their parameters as mass transfer rates and inclinations of their discs.
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Documento generato il 26/05/13 alle ore 09:58:28