We present spectroscopy of four cataclysmic variables. Using radial velocity measurements, we find orbital periods for the first time. The stars and their periods are GY Hya, 0.347230(9) d; SDSS J204448-045929, 1.68(1) d; V392 Hya, 0.324952(5) d; and RX J1951.7+3716, 0.492(1) d. We also detect the spectra of the secondary stars, estimate their spectral types, and derive distances based on surface brightness and Roche lobe constraints.
@article{arxiv.astro-ph/0511461,
title = {Spectroscopy of Four Cataclysmic Variables with Periods above 7 Hours},
author = {Christopher S. Peters and John R. Thorstensen},
journal= {arXiv preprint arXiv:astro-ph/0511461},
year = {2009}
}
Comments
22 pages, 3 figures, 5 tables, to be published in December 2006 PASP