Naslov
The nearby ellipsoidal variable TV Pictoris
(The nerarby ellipsoidal variable TV Pictoris)

Autori
Pavlovski, Krešimir ; Cuypers, J. ; David, M. ; Griffin, R.E.M. ; Hensberge, H. ; Ilijić, Saša ; Schneider, H. ; Verschueren, W.

Izvornik
Astronomy and astrophysics (0004-6361) 331 (1998), 2; 639-650

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

Ključne riječi
close binaries; variable stars; HD 30861 (TV Pic); fundamental parameters; rotation

Sažetak
TV Pic is identified as a bright, near-contact mid-A+early-F binary seen under a moderate inclination of 54 deg. From the analyses reported in this paper, it appears that both components are undermassive (1.2+0.4 Msun), and that the secondary rotates not synchronously but more than twice as fast. These conclusions follow from the analysis of (1) high-dispersion spectra near both quadrature phases, to which the secondary contributes roughly 10% in the visual light, and (2) light-curves in the Stroemgren and Walraven system covering the interval 3200-5600 A and a time span of more than 2600 rotational periods. The light-curves show a very pronounced OConnell effect, and only marginal colour variations. Models assuming a temperature spot either on the primary or the secondary explain the major part of the asymmetry in the light-curves, and are intended to provide useful initial estimates for more advanced mathematical codes. However, a more realistic physical model will require more discriminatory data, including spectroscopic observations in other spectral windows, and spectroscopy over the whole orbital cycle.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA