Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...311..889a&link_type=abstract
Astronomy and Astrophysics, v.311, p.889-900
Astronomy and Astrophysics
Astrophysics
33
Accretion, Accretion Disks, Stars: Individual: V485 Cen, Cataclysmic Variables, White Dwarfs
Scientific paper
We present time resolved photometry and spectroscopy of the dwarf nova V485 Cen. Significant radial velocity variations are detected in Hα only for a period equal to the previously detected 59 min photometric period (Augusteijn et al., =1993A&A...267L..55A), and we conclude that this is the orbital period of the system. Hα shows two components which vary with this period. One component dominates the line wings and originates from a region centered on the white dwarf. The second component dominates the line center and originates in the hot spot (the so-called S-wave). Using various observational constraints we derive a mass ratio of q=M_WD_/M_sec_~2.6 and a inclination of i~20-30deg. Strong evidence is found for a significant contribution from the secondary to the spectrum at wavelengths longer than ~5900Angstroems. We discuss the discovery of a 59min orbital period in the framework of evolutionary ideas about cataclysmic variables. The most likely explanation is that the secondary has a low, but finite, hydrogen content.
Augusteijn Th.
de Jong Jeroen A.
Paradijs Jan van
van der Hooft F.
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