期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 514, 期 1, 页码 200-207出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1343
关键词
stars: chromospheres; binaries: eclipsing; stars: rotation
资金
- National Science Foundation Graduate Research Fellowship Program [DGE-1343012]
- Ohio State University Presidential Fellowship
- National Science Foundation (NSF) [AST-1814440, AST-1908570]
- NASA through the NASA Hubble Fellowship [HST-HF2-51458.001-A]
- Space Telescope Science Institute [NAS5-265]
- NSF [AST-0908816]
- Gordon and Betty Moore Foundation [GBMF5490, GBMF10501]
- Mt. Cuba Astronomical Foundation
- Center for Cosmology and AstroParticle Physics (CCAPP) at OSU
- Chinese Academy of Sciences South America Center for Astronomy (CAS-SACA)
- Villum Fonden (Denmark)
- Center for Cosmology and AstroParticle Physics at the Ohio State University
Through the All-Sky Automated Survey for SuperNovae, we discovered a source with a significant decrease in flux, which is identified as a pair of rotationally variable stars with chromospheric activity, orbiting in a highly eccentric eclipsing orbit.
As part of an All-Sky Automated Survey for SuperNovae (ASAS-SN) search for sources with large flux decrements, we discovered a transient where the quiescent, stellar source ASASSN-V J192114.84+624950.8 rapidly decreased in flux by similar to 55 per cent (similar to 0.9 mag) in the g band. The Transiting Exoplanet Survey Satellite light curve revealed that the source is a highly eccentric, eclipsing binary. Fits to the light curve using PHOEBE find the binary orbit to have e = 0.79, P-orb = 18.462 d, and i = 88.6 degrees, and the ratios of the stellar radii and temperatures to be R-2/R-1 = 0.71 and T-e,T-2/T-e,T-1 = 0.82. Both stars are chromospherically active, allowing us to determine their rotational periods of P-1 = 1.52 d and P-2 = 1.79 d, respectively. A Large Binocular Telescope/Multi-Object Double Spectrograph spectrum shows that the primary is a late-G- or early-K-type dwarf. Fits to the spectral energy distribution show that the luminosities and temperatures of the two stars are L-1 = 0.48 L-circle dot, T-1= 5050 K, L-2 = 0.12 L-circle dot, and T-2 = 4190 K. We conclude that ASASSN-V J192114.84+624950.8 consists of two chromospherically active, rotational variable stars in a highly elliptical eclipsing orbit.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据