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New Beta Cephei Stars from the KELT Project

Labadie-Bartz, Jonathan and Handler, Gerald and Pepper, Joshua and Balona, Luis and De Cat, Peter and Stevens, Daniel J. and Lund, Michael B. and Stassun, Keivan G. and Rodriguez, Joseph E. and Siverd, Robert J. and James, David J. and Kuhn, Rudolf B. (2020) New Beta Cephei Stars from the KELT Project. Astronomical Journal, 160 (1). Art. No. 32. ISSN 1538-3881. https://resolver.caltech.edu/CaltechAUTHORS:20200624-104212945

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Abstract

We present the results of a search for Galactic β Cephei stars, which are massive pulsating stars with both pressure modes and mixed modes. Thus, these stars can serve as benchmarks for seismological studies of the interiors of massive stars. We conducted the search by performing a frequency analysis on the optical light curves of known O- and B-type stars with data from the Kilodegree Extremely Little Telescope exoplanet survey. We identify 113 β Cephei stars, of which 86 are new discoveries, which altogether represent a 70% increase in the number currently known. An additional 97 candidates are identified. Among our targets, we find five new eclipsing binaries and 22 stars with equal frequency spacings suggestive of rotational splitting of nonradial pulsation modes. Candidates for runaway stars among our targets and a number of interesting individual objects are discussed. Most of the known and newly discovered β Cephei stars will be observed by the Transiting Exoplanet Survey Satellite mission, providing by far the most comprehensive observational data set of massive main-sequence pulsating stars of sufficient quality for detailed asteroseismic studies. Future analysis of these light curves has the potential to dramatically increase our understanding of the structure of stellar interiors and the physical processes taking place therein.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-3881/ab952cDOIArticle
ORCID:
AuthorORCID
Labadie-Bartz, Jonathan0000-0002-2919-6786
Handler, Gerald0000-0001-7756-1568
Pepper, Joshua0000-0002-3827-8417
Balona, Luis0000-0003-1241-9792
De Cat, Peter0000-0001-5419-2042
Stevens, Daniel J.0000-0002-5951-8328
Lund, Michael B.0000-0003-2527-1598
Stassun, Keivan G.0000-0002-3481-9052
Rodriguez, Joseph E.0000-0001-8812-0565
Siverd, Robert J.0000-0001-5016-3359
James, David J.0000-0001-5160-4486
Kuhn, Rudolf B.0000-0002-4236-9020
Additional Information:© 2020. The American Astronomical Society. Received 2019 July 25; revised 2020 March 27; accepted 2020 April 16; published 2020 June 18. J.L.-B. acknowledges support from FAPESP (grant 2017/23731-1). G.H. has been supported by the Polish NCN grant 2015/18/A/ST9/00578. L.B. acknowledges support from the NRF (South Africa) and thanks Mr. Trevor Robinson for database assistance. D.J.S. acknowledges support from the Pennsylvania State University's Eberly Research Fellowship. D.J.J. was supported through the Black Hole Initiative at Harvard University, through a grant (60477) from the John Templeton Foundation and by National Science Foundation award AST-1440254. This project makes use of data from the KELT survey, including support from The Ohio State University, Vanderbilt University, and Lehigh University, along with the KELT follow-up collaboration. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of NASA's Astrophysics Data System. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France. This work has made use of the BeSS database, operated at LESIA, Observatoire de Meudon, France: http://basebe.obspm.fr. Facilities: TESS - , Gaia - , KELT. - Software: astropy (Astropy Collaboration et al. 2013), Period04 (Lenz & Breger 2005).
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)2017/23731-1
National Science Centre (Poland)2015/18/A/ST9/00578
National Research Foundation (South Africa)UNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
John Templeton Foundation60477
NSFAST-1440254
Gaia Multilateral AgreementUNSPECIFIED
Subject Keywords:Beta Cepheid variable stars ; Asteroseismology ; Stellar oscillations ; Multi-periodic variable stars ; Pulsating variable stars ; Short period variable stars ; Early-type variable stars ; Light curves ; Light curve classification ; Surveys ; B stars
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Beta Cepheid variable stars (148); Asteroseismology (73); Stellar oscillations (1617); Multi-periodic variable stars (1079); Pulsating variable stars (1307); Short period variable stars (1453); Early-type variable sta
Record Number:CaltechAUTHORS:20200624-104212945
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200624-104212945
Official Citation:Jonathan Labadie-Bartz et al 2020 AJ 160 32
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104007
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:24 Jun 2020 19:05
Last Modified:24 Jun 2020 19:05

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