HII 2407: AN ECLIPSING BINARY REVEALED BY K2 OBSERVATIONS OF THE PLEIADES

• Published in: The Astrophysical journal Vol. 814; no. 1; pp. 1 - 8
• Main Authors: David, Trevor J., Stauffer, John, Hillenbrand, Lynne A., Cody, Ann Marie, Conroy, Kyle, Stassun, Keivan G., Pope, Benjamin, Aigrain, Suzanne, Gillen, Ed, Cameron, Andrew Collier, Barrado, David, Rebull, L. M., Isaacson, Howard, Marcy, Geoffrey W., Zhang, Celia, Riddle, Reed L., Ziegler, Carl, Law, Nicholas M., Baranec, Christoph
• Format: Journal Article
• Language: English
• Published: United States The American Astronomical Society 20.11.2015
• Subjects: ABSORPTION SPECTROSCOPY; Astronomical models; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BENCHMARKS; binaries: eclipsing; COMPARATIVE EVALUATIONS; Dynamical systems; Dynamics; ECLIPSE; Eclipsing binary stars; Evolutionary; INFRARED SPECTRA; LIMITING VALUES; MASS; Mathematical models; open clusters and associations: general; Orbitals; PHOTOMETRY; RADIAL VELOCITY; ROTATION; STAR CLUSTERS; STAR EVOLUTION; STARS; stars: fundamental parameters; stars: pre-main sequence; stars: rotation; STARSPOTS
• ISSN: 0004-637X; 1538-4357; 1538-4357
• DOI: 10.1088/0004-637X/814/1/62

ABSTRACT The star HII 2407 is a member of the relatively young Pleiades star cluster and was previously discovered to be a single-lined spectroscopic binary. It is newly identified here within Kepler/K2 photometric time series data as an eclipsing binary system. Mutual fitting of the radial velocity and photometric data leads to an orbital solution and constraints on fundamental stellar parameters. While the primary has arrived on the main sequence, the secondary is still pre-main sequence and we compare our results for the M/M and R/R values with stellar evolutionary models. We also demonstrate that the system is likely to be tidally synchronized. Follow-up infrared spectroscopy is likely to reveal the lines of the secondary, allowing for dynamically measured masses and elevating the system to benchmark eclipsing binary status.