Naslov
Spectroscopy and photometry of the interacting binary CX Draconis - evidence for circumstellar matter

Autori
Koubsky, Pavel ; Harmanec, Petr ; Božić, Hrvoje ; Percy, J.R. ; Žižnovsky, Jozef ; Huang, L. ; Richards, M.T. ; Hadrava, Petr ; Šimon, V.

Izvornik
Hvar Observatory Bulletin (0351-2657) 22 (1998), 1; 17-34

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, kongresno priopcenje, znanstveni

Ključne riječi
emission-line stars; spectroscopic Be-binaries; CX Dra

Sažetak
An analysis of an extensive collection of spectroscopic and photometric observations of the interacting binary CX Dra led to the following main conclusions: 1. Both, spectroscopy and photometry indicate that the circumstellar environment changes in cycles of a few hundred days. The length of the cycles is variable. 2. The long-term H-alpha emission and light changes of CX Dra have a very similar character. This may mean a common cause which drives both spectroscopic and photometric long-term variations of the star. 3. The equivalent width of the H-alpha difference profiles and the light of CX Dra are modulated with the orbital period of 6d696. The corresponding phase diagrams indicate a great deal of scatter, but the modulation is quite conspicuous when long data strings are used. The pattern of the phase diagram constructed for H-alpha difference profiles suggests a permanent presence of the emission. 4. The radial velocities of the H-alpha emission peak follow a S-wave pattern. The resulting velocity (Doppler) map shows that the source of the single-peaked emission lies close to the L_1 point near the secondary star.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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