Magnetic inflation and stellar mass. III. revised parameters for the component stars of NSVS 07394765
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Published version
Date
2019-08
Authors
Healy, Brian F.
Han, Eunkyu
Muirhead, Philip S.
Skiff, Brian
Polakis, Tom
Rilinger, Anneliese
Swift, Jonathan J.
Version
Published version
OA Version
Citation
Brian F. Healy, Eunkyu Han, Philip S. Muirhead, Brian Skiff, Tom Polakis, Anneliese Rilinger, Jonathan J. Swift. 2019. "Magnetic Inflation and Stellar Mass. III. Revised Parameters for the Component Stars of NSVS 07394765." The Astronomical Journal, Volume 158, Issue 2, pp. 89 - 89. https://doi.org/10.3847/1538-3881/ab2fe5
Abstract
We perform a new analysis of the M-dwarf–M-dwarf eclipsing binary system NSVS 07394765 in order to investigate the reported hyper-inflated radius of one of the component stars. Our analysis is based on archival photometry from the Wide Angle Search for Planets, new photometry from the 32 cm Command Module
Observatory telescope in Arizona and the 70 cm telescope at Thacher Observatory in California, and new high-resolution infrared spectra obtained with the Immersion Grating Infrared Spectrograph on the Discovery Channel Telescope. The masses and radii we measure for each component star disagree with previously reported measurements. We show that both stars are early M-type main-sequence stars without evidence for youth or hyper-inflation ( = - ☉ M M + 1 0.661 0.036 0.008 , = - ☉ M M + 2 0.608 0.028 0.003 , = - ☉ + R1 0.599 0.019 R 0.032 , = - ☉ + R2 0.625 0.027 R 0.012 ), and
we update the orbital period and eclipse ephemerides for the system. We suggest that the likely cause of the initial hyper-inflated result is the use of moderate-resolution spectroscopy for precise radial velocity measurements.
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© 2019 The American Astronomical Society.