Issue |
A&A
Volume 415, Number 2, February IV 2004
|
|
---|---|---|
Page(s) | 609 - 616 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20034623 | |
Published online | 11 February 2004 |
Hα variability of the recurrent nova T Coronae Borealis*
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
Corresponding author: V. Stanishev, vall@astro.bas.bg
Received:
25
July
2002
Accepted:
17
October
2003
We analyze Hα observations of the recurrent nova T
CrB obtained during the last decade. For the first time the
Hα emission profile is analyzed after subtraction of
the red giant contribution. Based on our new radial velocity
measurements of the Hα 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
,
and
, respectively. The radial
velocity of the central dip in the Hα 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
Hα 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 Hα 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
© ESO, 2004
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