Naslov
CH Cygni: A symbiotic star in its transition phase to quiescence

Autori
Kotnik-Karuza, Dubravka ; Jurdana-Šepić, Rajka

Izvornik
Astronomical and astrophysical transactions (1055-6796) 13 (1997); 303-307

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
symbiotic stars; CH Cyg; M type stars; quiescence

Sažetak
The transition period of symbiotic stars from the activity to the quiescent phase has not yet been sufficiently investigated. In order to establish the relation of such stars to the recurrent novae and on the other side, to the normal stars of the same spectral type, it is important to follow the spectrum also during the quiescent phases. The behaviour of the cool component of the symbiotic star CH Cygni over the two year period after its longest 1977-1986 outburst has been investigated in the optical spectral region.The results show that CH Cygni has been very close to the condition of optical quiescency and that the comparison with normal stars could predict its future behaviour. The relevant physical parameters, such as excitation temperature and microturbulent velocity, of M type stars 30 Her and beta And have been taken for reference. The curve of growth method with refined fitting procedure has been used.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA