Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55..896t&link_type=abstract
Astronomy Reports, Volume 55, Issue 10, pp.896-910
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We present the results of our analysis of the spectrophotometric and photometric data for the symbiotic nova PU Vul acquired in 2001-2008. The continuum in the optical observed in 2006-2008 cannot be reconciled with a standard model including light from the cool component, hot component, and nebula. The hot component's temperature increased to 194 000 K by 2008, while its luminosity decreased by a factor of ten compared to the plateau of 1979-1991. The evolution of the hot component as reflected by the Hertzsprung-Russell diagram does not agree with a theoretical model describing the evolution of a thermonuclear outburst in a white-dwarf envelope. We estimate the mass of the hot component to be 0.5 M &sun; based on the luminosity of the hot component during the plateau stage. Our spectroscopy reveals periodic continuum-flux variations due to brightness variability of the cool component, with an amplitude of at least 2 m at 7000 Å. The spectral type of the cool component in 2008 was M6.3.
Esipov Valentine F.
Kolotilov Eugenii A.
Nadzhip Eh. A.
Shenavrin V. I.
Tarasova T. N.
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