Naslov
Probing the models: V380 Cygni revisited

Autori
Pavlovski, Krešimir ; Tamajo, Ettore ; Koubský, Pavel ; Southworth, John ; Yang, Stevenson ; Kolbas, Vladimir

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
International Conference 'Binaries - key to comprehension of the Universe'

Mjesto i datum
Brno, Češka Republika, 08.06.2009. - 12.06.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
binary stars; V380 Cyg; spectroscopy; evolutionary models; chemical composition

Sažetak
The eclipsing and double-lined spectroscopic binary V380\, Cyg is a particularly interesting probe of stellar evolution as its primary component is a high-mass star which has evolved to the terminal age of core hydrogen burning. We have secured extensive new high-resolution echelle and classical grating spectra at Ondrejov, Victoria, La Palma and Calar Alto. We have applied spectral disentangling to unveil the individual spectra of the two components, and to obtain new spectroscopic elements. The secondary star contributes only about $\sim$ 4\% of the system light, and remains the main limitation to measurements of the system's properties. A detailed abundance analysis has been performed fitting non-LTE theoretical line profiles to the disentangled spectrum of the primary star, and reveals an elemental abundance pattern reminiscent of a typical nearby B star. Contrary to the predictions of recent theoretical evolution models which include rotational mixing, no trace of abundance modifications due to the CNO cycle are detected. No match can be found between the predictions of these models and the properties of the primary star: a mass discrepancy of 1.5 M$\_odot$ exists and remains unexplained.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA