Variable Star Population in the Open Cluster NGC 6819 Observed by the Kepler Spacecraft

• Autorzy: Sanjayan, S. , Baran, A. S. , Németh, P. , Kinemuchi, K.
• Języki publikacji: EN

Abstrakty

EN

We present the list of variable stars we found in the Kepler superstamp data covering approximately nine arcminutes from the central region of NGC 6819. This is a continuation of our earlier work. We classified the variable stars based on the variability type and we established their cluster membership based on the available Gaia Data Release 3 astrometry. Our search revealed 385 variable stars but only 128 were found to be cluster members. In the case of eclipsing and contact binaries we calculated the mid-times of eclipses and derived ephemerides. We searched for eclipse timing variation using the observed minus calculated diagrams. Only five objects show significant orbital period variation. We used isochrones calculated within the MESA Isochrones and Stellar Tracks project and derived the average age (2.54 Gyr), average distance (2.3 kpc) and iron content [Fe/H]=-0.01(2), of NGC 6819. We confirm this distance by the one derived from Gaia astrometry of the cluster members with membership probabilities greater than 0.9.

Słowa kluczowe

EN

open clusters: individual: NGC 6819; associations: individual: NGC 6819; stars: variables: general

• Czasopismo: Acta Astronomica
• Rocznik: 2022
• Tom: Vol. 72, No. 4
• Strony: 267--295
• Opis fizyczny: Bibliogr. 63 poz., tab., wykr.

Twórcy

autor

Sanjayan, S.

• ARDASTELLA Research Group
• Centrum Astronomiczne im. Mikołaja Kopernika, Polskiej Akademii Nauk, ul. Bartycka 18, 00-716 Warszawa, Poland

autor

Baran, A. S.

• ARDASTELLA Research Group
• Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland

autor

Németh, P.

• ARDASTELLA Research Group
• Astroserver.org, Fötér 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

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Identyfikatory

DOI

10.32023/0001-5237/72.4.3