Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...238..325a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 238, no. 1-2, Nov. 1990, p. 325-330.
Astronomy and Astrophysics
Astrophysics
13
Accretion Disks, Cataclysmic Variables, G Stars, Novae, Planetary Nebulae, Emission Spectra, Light Curve, Stellar Rotation, Subgiant Stars, Ubv Spectra, White Dwarf Stars
Scientific paper
Simultaneous photometric and spectroscopic observations of the visible central star BD - 22 deg 3467 of the large planetary nebula Abell 35 are reported. This fast rotating star has a spectral type G8IV, and shows a double peaked emission line at H-alpha, varying with a period identical to the photometric one, equal to 0.7653 days. Both the maximum brightness of the system, and the amplitude of the light curves in UBV have decreased between 1986 and 1988. Observations are interpreted as the behavior of a cataclysmic binary, where one component is a Roche-lobe-filling subgiant star and the other a white dwarf surrounded by an accretion disk. The size of the system is about 4 solar radii, with i = 15 deg; this value is compatible with the radius of a subgiant star. The mass of this star is estimated to about 1.5 solar masses. The brightness decrease could be caused by erratic dark starspots, probably linked with chromospheric activity of the G star.
Acker Agnés
Jasniewicz Gerard
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