Abstract
view Abstract Citations (55) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Orbital studies of cataclysmic binaries. II. Three objects from the Palomar-Green sample. Thorstensen, J. R. Abstract I obtained radial-velocity spectra of PG 0834 + 488, PG 1003 + 678 = CH UMa, and PG 1711 + 336 = V795 Her to determine their orbital periods. PG 0834 + 488 has an apparently normal dwarf-nova type spectrum, and its orbital period is here found to be 6.4 hr with no cycle-count ambigu- ity. The present data show no visible absorption from a secondary star. PG 1003 + 678 = CH UMa most likely has a period of 8.3 hr, which is an alias of the preliminary period of 12.5 hr announced by Thorstensen (1985); the 12.5 hr period remains possible. It shows absorption features in its spectrum characteristic of a late-type secondary star, and these features appear to have velocities in antiphase to the emission lines. The velocity amplitude is small and the lines narrow, suggesting a low inclination. PG 1711 + 336 = V795 Her has a most likely period of 14.8 hr, unusually long for a cataclysmic binary; because of the weakness of the emission lines, some doubt remains about the period. The 2.75 hr photometric period determined by Baidak et al. (1985) is not indicated in the velocities. The emission lines are weak and the flux distribution very blue. The object is evidently a nova-like variable in a perpetual high state. if the photometric and spectroscopic periods are both correct, it may be a very slow DQ Her star as well. Publication: The Astronomical Journal Pub Date: April 1986 DOI: 10.1086/114070 Bibcode: 1986AJ.....91..940T Keywords: Cataclysmic Variables; Orbit Calculation; Radial Velocity; Stellar Motions; Stellar Orbits; Stellar Spectra; Absorption Spectra; Companion Stars; Emission Spectra; Late Stars; Wavelengths; Astrophysics full text sources ADS | data products SIMBAD (7) Related Materials (1) Part 1: 1985AJ.....90.2082T
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