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Issue A&A
Volume 415, Number 2, February IV 2004
Page(s) 609 - 616
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20034623



A&A 415, 609-616 (2004)
DOI: 10.1051/0004-6361:20034623

H $\alpha$ variability of the recurrent nova T Coronae Borealis

V. Stanishev1, R. Zamanov2, N. Tomov3 and P. Marziani4

1  Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko Shouse Blvd., 1784 Sofia, Bulgaria
2  Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD, UK
3  Institute of Astronomy and Isaac Newton Institute of Chile - Bulgarian Branch, National Astronomical Observatory Rozhen, PO Box 136, 4700 Smolyan, Bulgaria
4  INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122 Padova, Italy

(Received 25 July 2002 / Accepted 17 October 2003)

Abstract
We analyze H $\alpha$ observations of the recurrent nova obtained during the last decade. For the first time the H $\alpha$ emission profile is analyzed after subtraction of the red giant contribution. Based on our new radial velocity measurements of the H $\alpha$ emission line we estimate the component masses of T CrB . It is found that the hot component is most likely a massive white dwarf. We estimate the inclination and the component masses to be $i\simeq67^\circ$, $M_{\rm WD}\simeq1.37\pm0.13~M_\odot$ and $M_{\rm RG}\simeq1.12\pm0.23~M_\odot$, respectively. The radial velocity of the central dip in the H $\alpha$ profile changes nearly in phase with that of the red giant's absorption lines. This suggests that the dip is most likely produced by absorption in the giant's wind.

Our observations cover an interval when the H $\alpha$ and the U-band flux vary by a factor of ~6, while the variability in B and V is much smaller. Based on our observations, and archival ultraviolet and optical data we show that the optical, ultraviolet and H $\alpha$ fluxes strongly correlate. We argue that the presence of an accretion disc can account for most of the observed properties of  T CrB .


Key words: accretion, accretion discs -- stars: individual: T CrB -- stars: novae, cataclysmic variables -- stars: binaries: symbiotic

Offprint request: V. Stanishev, vall@astro.bas.bg

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