Two Long-period Cataclysmic Variable Stars: ASASSN-14ho and V1062 Cyg
| Autor: | Raphael E. Hviding, Callum A. Hening, Patrick A. Woudt, L. Claire Gasque, John R. Thorstensen, Mokhine Motsoaledi, H. Breytenbach, Kerry Paterson |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Astrophysics::High Energy Astrophysical Phenomena Foundation (engineering) FOS: Physical sciences Library science Bursary Cataclysmic variable star Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Radio astronomy observatory International education Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Long period 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences |
| Zdroj: | The Astronomical Journal. 158:156 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/ab3e04 |
| Popis: | We report spectroscopy and photometry of the cataclysmic variable stars ASASSN-14ho and V1062 Cyg. Both are dwarf novae with spectra dominated by their secondary stars, which we classify as approxomately K4 and M0.5, respectively. Their orbital periods, determined mostly from the secondary stars' radial velociites, proved to be nearly identical, respectively 350.14 +- 0.15 and 348.25 +- 0.60 min. The H-alpha emission line in V1062 Cyg displays a relatively sharp emission component that tracks the secondary's motion, which may arise on the irradiated face of the secondary; tihs is not often seen and may indicate an unusually strong flux of ionizing radiation. Both systems exhibit double-peaked orbital modulation consistent with ellipsoidal variation from the changing aspect of the secondary. We model these variations to constrain the orbital inclination i, and estimate approximate component masses based oni and the secondary velocity amplitude K2. |
| Databáze: | OpenAIRE |
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