Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1405t&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 754, pp. 1405-1411.
Astronomy and Astrophysics
Astronomy
21
Stars: Binaries: Close, Stars: Binaries: Spectroscopic, Stars: Distances, Stars: Novae, Cataclysmic Variables
Scientific paper
From Hα radial velocities taken in quiescence we find orbital periods of 0.1591+/-0.0004 days, or 3.82 hr, for CY Lyr, 0.207584+/-0.000007 days, or 4.98 hr, for TW Tri, and 0.16870+/-0.00007 days, or 4.05 hr, for VW Vul. The period of VW Vul is much longer than a previously published value, and the spectrum suggests that we caught this Z Cam star in standstill. The revision of VW Vul's period resolves its problematic status as a short-period dwarf nova that did not show superoutbursts. The quiescent spectra of CY Lyr and TW Tri are typical of dwarf novae between outbursts, and both show the contribution of a late-type secondary, of type ~M3.5 in CY Lyr and ~M1 in TW Tri. From the M-dwarf contribution in the quiescent spectrum we estimate distances of ~330 pc for CY Lyr and ~800 pc for TW Tri. On 1997 June 30 UT we observed CY Lyr in a rise to outburst, and we present spectra obtained approximately hourly as the object brightened.
Kemp Jonathan
Taylor Cynthia J.
Thorstensen John R.
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