Original Research ARTICLE
Properties of 249 delta Scuti Variable Star Candidates Observed During the NASA K2 Mission
- 1Los Alamos National Laboratory (DOE), United States
- 2Department of Astronomy, New Mexico State University, United States
In the second phase of the NASA Kepler mission (K2), the Kepler spacecraft observed fields along the ecliptic plane for about 80 days each to search for planetary transits and monitor stellar variability. We analyzed the light curves of thousands of main-sequence stars observed as part of the Kepler Guest Observer program. Here we summarize the statistics of discovery and properties of the pulsation amplitude spectra for 249 delta Scuti variable stars or candidates observed during K2 Campaigns 4 through 17. delta Scuti variables are core or shell-hydrogen burning stars about twice as massive as the Sun, pulsating in many simultaneous radial and non-radial modes, with periods of about two hours. The growing collection of long time-series high signal-to-noise photometric data from space missions such as Kepler, combined with constraints from ground and space-based data, will be useful to constrain the interior structure of these types of variables. We hope that this list of delta Sct candidates observed by Kepler may be useful as a starting point for identifying promising targets for asteroseismic investigations.
Keywords: Stars: Delta Scuti, Stars: Variable, Stars: main-sequence, Stars: gamma Doradus, NASA Kepler Mission
Received: 16 Jan 2019;
Accepted: 09 May 2019.
Edited by:Jadwiga Daszynska-Daszkiewicz, University of Wrocław, Poland
Reviewed by:Andrzej S. Baran, Pedagogical University of Kraków, Poland
Margit Paparo, Konkoly Observatory (MTA), Hungary
Copyright: © 2019 Guzik, Garcia and Jackiewicz. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Joyce A. Guzik, Los Alamos National Laboratory (DOE), Los Alamos, United States, firstname.lastname@example.org