Issue |
A&A
Volume 382, Number 3, FebruaryII 2002
|
|
---|---|---|
Page(s) | 974 - 983 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20011641 | |
Published online | 15 February 2002 |
Time-resolved spectroscopy and photometry of the dwarf nova FS Aurigae in quiescence*
Department of Astronomy and Mechanics, Udmurtia State University, Universitetskaia, 1, Izhevsk 426034, Russia
Corresponding author: benj@uni.udm.ru
Received:
2
September
1999
Accepted:
16
November
2001
We present results of non-simultaneous time-resolved photometric and spectroscopic
observations of the little-studied dwarf nova FS Aur in quiescence.
The spectrum of FS Aur shows strong and broad emission lines of hydrogen and
He I, and of weaker He II and C III/N III blend, similar to
other quiescent dwarf novae. All emission lines are single-peaked, however their
form varies with orbital phase. Absorption lines from a late-type secondary are
not detected. From the radial velocity measurements of the hydrogen lines Hβ and
Hγ we determined a most probable orbital period
.
This period agrees well with the 0
0595 ± 0
0001
estimate by Thorstensen et al. (1996). On the other hand, the period of
photometric modulations is longer than the spectroscopic period and can be
estimated as 3 hours. Longer time coverage during a single night is
needed to resolve this problem.
Using the semi-amplitude of the radial velocities, obtained from measurements
of hydrogen and helium lines, and some empirical and theoretical relations
we limited the basic parameters of the system: a mass ratio
, a primary mass
, a secondary mass
,
and an inclination angle
.
Doppler tomography has shown at least two bright regions in the accretion disk of FS Aur.
The first, brighter spot is located at phase about 0.6. The second spot is located
opposite the first one and occupies an extensive area
at phases about
.
Key words: accretion, accretion disks / stars: binaries: spectroscopic / stars: cataclysmic variables / stars: individual: FS Aur
© ESO, 2002
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