Variable Star Population in the Open Cluster NGC 6791 Observed by the Kepler Spacecraft

• Autorzy: Sanjayan S. , Baran A. S. , Németh P. , Kinemuchi K. , Ostrowski J. , Sahoo S. K.

Identyfikatory

DOI

10.32023/0001-5237/72.2.1

• Języki publikacji: EN

Abstrakty

EN

We present the list of variable stars we found in the Kepler superstamp data covering approximately 9' from the central region of NGC 6791. We classified the variable stars based on the variability type and we established their cluster membership based on the available Gaia Early Data Release 3 astrometry, by means of the Bayesian Gaussian mixture models. In total we found 278 variable objects, among which 17 binaries, 45 pulsators, 62 rotational and five unclassified variables are cluster members. The remaining 28 binaries, 25 pulsators, 83 rotational, four unclassified and nine unidentified variables are either not members or their membership is not established. In the case of eclipsing binaries we calculated the mid-times of eclipses and derived ephemerides. We searched for eclipse timing variation by means of the observed minus calculated diagrams. Only three objects show significant orbital period variation. Independently of a recently published report, we found 119 new variables. We used isochrones calculated within the MIST project and derived the age (8.91 Gyr), average distance (4134 pc) and iron content [Fe/H] (0.26-0.28), of NGC 6791. Using the cluster members with membership probabilities greater than 0.9, we calculated the distance to the cluster of 4123(31) pc, which agrees with the result from our isochrone fitting.

Słowa kluczowe

EN

open clusters and associations: individual: NGC 6791; binaries: general; stars: oscillations; stars: rotation

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2022
• Tom: Vol. 72, No. 2
• Strony: 77--102
• Opis fizyczny: Bibliogr. 60 poz., tab., wykr.

Twórcy

autor

Sanjayan S.

• ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Cracow, ul. Podchorążych 2, 30-084 Kraków, Poland
• Centrum Astronomiczne im. Mikołaja Kopernika, Polskiej Akademii Nauk, ul. Bartycka 18, 00-716 Warszawa, Polska

autor

Baran A. S.

• ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Cracow, ul. Podchorążych 2, 30-084 Kraków, Poland
• Embry-Riddle Aeronautical University, Department of Physical Sciences, Daytona Beach, FL 32114, USA
• Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO 65897, USA

autor

Németh P.

• ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Cracow, ul. Podchorążych 2, 30-084 Kraków, Poland
• Astroserver.org, Fő tér 1, 8533 Malomsok, Hungary
• Astronomical Institute of the Czech Academy of Sciences, Fričova 298, CZ-251 65 Ondřejov, Czech Republic

autor

Kinemuchi K.

• Department of Astronomy, New Mexico State University, Box 30001, MSC 4500, Las Cruces, NM 88003, USA
• Apache Point Observatory, 2001 Apache Point Road, P.O. Box 59, Sunspot, NM 88349-0059

autor

Ostrowski J.

• ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Cracow, ul. Podchorążych 2, 30-084 Kraków, Poland

autor

Sahoo S. K.

• ARDASTELLA Research Group, Institute of Physics, Pedagogical University of Cracow, ul. Podchorążych 2, 30-084 Kraków, Poland
• Centrum Astronomiczne im. Mikołaja Kopernika, Polskiej Akademii Nauk, ul. Bartycka 18, 00-716 Warszawa, Polska

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