Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...409..647b&link_type=abstract
Astronomy and Astrophysics, v.409, p.647-657 (2003)
Astronomy and Astrophysics
Astrophysics
2
Stars: Binaries: Close, Stars: Novae, Cataclysmic Variables, Stars: Individual: At Ara
Scientific paper
The first time-resolved spectroscopic observations of the dwarf nova AT Ara are presented. The system is a double lined spectroscopic binary. Thus, radial velocity curves of both, emission lines from the accretion disk (in this particular case of Hα ) and of the secondary star can be measured. An orbital period of 0.37551 days is derived, placing AT Ara among the cataclysmic variables with the longest revolution periods. The RV-amplitudes yield a mass ratio of q = M2/M1 = 0.79 +/- 0.09. The spectral type of the secondary star is K2. AT Ara has an intermediate orbital inclination of 38o +/- 5o. The secondary star has a mass and a radius of M2 = 0.42 +/- 0.10 Msun and R2 = 0.84 +/- 0.19 Rsun, respectively. It is thus significantly larger than a main sequence star of the same mass. Evolutionary calculations of cataclysmic variables suggest that the secondary is nuclearly evolved to a certain degree. The distance to AT Ara is estimated to be of the order of 600 pc.
Based on observations obtained at the Observatório do Pico dos Dias, LNA/MCT, Itajubá, Brazil.
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