Optical Studies of 8 AM Herculis-Type Cataclysmic Variable Stars

Autor:	Thorstensen, John R., Motsoaledi, Mokhine, Buckley, David A. H., Woudt, Patrick, Warner, Brian
Rok vydání:	2020
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - High Energy Astrophysical Phenomena
Druh dokumentu:	Working Paper
DOI:	10.3847/1538-3881/ab9d1b
Popis:	We report detailed follow-up observations of 8 cataclysmic variable stars (CVs) that are apparently AM Her stars, also called polars. For all, we either determine orbital periods for the first time, or improve on existing determinations. The seven for which we have spectra show the high-amplitude radial velocity curves and prominent HeII 4686 emission lines characteristic of strongly magnetic CVs, and their periods, which range from 81 to 219 minutes, are also typical for AM Her stars. Two objects from the Gaia-alerts index, Gaia18aot and Gaia18aya, are newly identified as CVs. Another, RX J0636.3+6554, eclipses deeply, while CSS080228:081210+040352 shows a sharp dip that is apparently a partial eclipse. The spectrum of Gaia18aya has a cyclotron harmonic near 5500 Angstroms that constrains the surface field to about 49 Megagauss or greater. Comment: Astronomical Journal, in press
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2006.08078 Zobrazit plný text záznamu View this record from Arxiv