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Rapidly Rotating, X-Ray Bright Stars in the Kepler Field

Howell, Steve B. and Mason, Elena and Boyd, Patricia and Smith, Krista Lynne and Gelino, Dawn M. (2016) Rapidly Rotating, X-Ray Bright Stars in the Kepler Field. Astrophysical Journal, 831 (1). Art. No. 27. ISSN 0004-637X.

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We present Kepler light curves and optical spectroscopy of twenty X-ray bright stars located in the Kepler field of view. The stars, spectral type F-K, show evidence for rapid rotation including chromospheric activity 100 times or more above the Sun at maximum and flaring behavior in their light curves. Eighteen of our objects appear to be (sub)giants and may belong to the class of FK Com variables, which are evolved rapidly spinning single stars with no excretion disk and high levels of chromospheric activity. Such stars are rare and are likely the result of W UMa binary mergers, a process believed to produce the FK Com class of variable and their descendants. The FK Com stage, including the presence of an excretion disk, is short lived but leads to longer-lived stages consisting of single, rapidly rotating evolved (sub)giants with high levels of stellar activity.

Item Type:Article
Related URLs:
URLURL TypeDescription
Howell, Steve B.0000-0002-2532-2853
Smith, Krista Lynne0000-0001-5785-7038
Gelino, Dawn M.0000-0003-1274-2784
Additional Information:© 2016. The American Astronomical Society. Received 2016 July 31; revised 2016 August 24; accepted 2016 August 24; published 2016 October 25. We wish to thank the staff of the Kepler project at NASA Ames research Center, the NASA Exoplanet Archive, and the Mt. Palomar Observatory for their continued support of the Kepler mission and its follow-up work. K.L.S. acknowledges support from the NASA Earth and Space Sciences Fellowship (NESSF). Facilities: Hale 200'' telescope - , Kepler - , SWIFT - , and NASA Exoplanet Archive - .
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
NASA Earth and Space Science FellowshipUNSPECIFIED
Subject Keywords:stars: activity – stars: chromospheres – stars: evolution – stars: rotation
Issue or Number:1
Record Number:CaltechAUTHORS:20161025-110144993
Persistent URL:
Official Citation:Steve B. Howell et al 2016 ApJ 831 27
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71446
Deposited By: George Porter
Deposited On:25 Oct 2016 19:06
Last Modified:09 Mar 2020 13:19

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