A search for variable stars in the four open star clusters

Durgapal, Alok; Rangwal, Geeta; Bisht, D.; Kaur, Harmeen; Yadav, R. K. S.; Pandey, J. C.

doi:10.1007/s12036-020-09628-9

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Using K2 , Rebull et al ( 2016 ) report eight pulsator-like stars in the Pleiades (log t /y ∼ 8.2) of which five are clear δ Sct stars with periods ࣠ 2.4 h with three more with similar periods ∼7.2 hrs. More recently, Durgapal et al ( 2020 ) searched for variable stars in four OCs using a 1.0m ground based telescope and found 5 δ Sct stars, 4 in King 7 (log t /y ∼ 8.9) and 1 in King 5 (log t /y ∼ 9.1); their periods are in the range of 3.1-5.0 h.…”

Section: δ S C U T I S Ta R S I N O P E N C L U S T E R Smentioning

confidence: 99%

The OmegaWhite survey for short-period variable stars – VI. Open clusters

Toma,

Ramsay,

Jeffery

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Using light curves with ∼3 min cadence and a duration of 2 hrs made using the OmegaWhite survey, we present the results of a search for short-period variable stars in the field of 20 open clusters. We identified 92 variable stars in these fields. Using a range of cluster member catalogues and Gaia EDR3 data, we have determined that 10 are cluster members and 2 more are probable members. Based on their position on the Gaia HRD and their photometric periods, we find that most of these are δ Sct stars. We obtained low-resolution optical spectroscopy of some of these cluster members and field stars. We discuss the cluster variable stars in the context of δ Sct stars in other open clusters.

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Section: δ S C U T I S Ta R S I N O P E N C L U S T E R Smentioning

confidence: 99%

The OmegaWhite survey for short-period variable stars – VI. Open clusters

Toma,

Ramsay,

Jeffery

et al. 2022

Monthly Notices of the Royal Astronomical Society

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Interstellar Extinction in the Direction of the Open Cluster King 7 and New Parameters of the Cluster

Straižys

Kazlauskas

Boyle

et al. 2021

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Interstellar extinction in two concentric square areas of the sizes 1.25 × 1.25 deg2 and 0.2 × 0.2 deg2 in the direction of open cluster King 7 is investigated applying two-dimensional photometric classification of stars observed in the Vilnius seven-color photometric system down to V = 15.5 mag (1084 stars) and 19.5 mag (584 stars), respectively. The cluster members (284 stars) are identified applying their coordinates, proper motions, and parallaxes taken from the Gaia EDR3 catalog. New parameters of the cluster (distance, diameter, interstellar extinction, and age) are obtained. Photogeometric distances of stars are taken from Bailer-Jones et al. (2021) based on the Gaia parallaxes from EDR3. Physically the cluster is located at the outer edge of the Perseus spiral arm at d = 2.74 kpc, its diameter is 9.6 pc, the age is 175 ± 25 Myr, the earliest stars are of spectral classes B6–B7. The average interstellar extinction A V = 4.24 mag. From the radial velocities of CO and the Galactic rotation curve we estimate distances to the nearby dust clouds TGU H989 P2 and P3 at 650–670 pc from the Sun.

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A search for variable stars in the four open star clusters

Cited by 2 publications

References 21 publications

The OmegaWhite survey for short-period variable stars – VI. Open clusters

The OmegaWhite survey for short-period variable stars – VI. Open clusters

Interstellar Extinction in the Direction of the Open Cluster King 7 and New Parameters of the Cluster

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