The study of Kuwano-Honda's peculiar object (PU Vul). II.
Abstract
The results of photometric, spectrophotometric, polarimetric and spectral observations of the peculiar object PU Vul carried out in 1983 - 86 within the wavelength range from 0.24 to 5 micrometer are given. Apart irregular brightness variations with the amplitude up to ΔU ≡ 0m2 - 0m3, the authors found a systematic brightness decrease of this binary system in optical region and a decrease of its colour indices. Variations of intrinsic polarimetric parameters pλ* and θλ* with time and the significant variety of their wavelength dependences are found. Three plausible models have been considered for the interpretation of the observed polarization of PU Vul. The comparison of the authors' observations with the computations by Iben (1982) of an accreting white dwarf evolution does not leave a doubt that PU Vul is a binary system whose burst in 1978 was due to a temporal transition of an accreting component to a rather short phase "supergiant mimicry". The mass of this component does not exceed 1.1 Msun and the accretion rate is lower than 10-8Msun/year.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1990
- Bibcode:
- 1990IzKry..81...28H
- Keywords:
-
- Astronomical Polarimetry;
- Giant Stars;
- Peculiar Stars;
- Stellar Luminosity;
- Stellar Spectra;
- Stellar Spectrophotometry;
- Color-Color Diagram;
- Colorimetry;
- Light Curve;
- Spectral Line Width;
- Spectrophotometry;
- Spectrum Analysis;
- Astronomy;
- Nova Vulpeculae 1979;
- Novae: Stellar Evolution;
- Novae: Stellar Models;
- Novae: Binaries