A study of pulsation & rotation in a sample of A-K type stars in the Kepler field
- Title
- A study of pulsation & rotation in a sample of A-K type stars in the Kepler field
- Creator
- Chowdhury S.; Joshi S.; Engelbrecht C.A.; De Cat P.; Joshi Y.C.; Paul K.T.
- Description
- We present the results of time-series photometric analysis of 15106 A-K type stars observed by the Kepler space mission. We identified 513 new rotational variables and measured their starspot rotation periods as a function of spectral type and discuss the distribution of their amplitudes. We examined the well-established period-color relationship that applies to stars of spectral types F5-K for all of these rotational variables and, interestingly, found that a similar period-color relationship appears to extend to stars of spectral types A7 to early-F too. This result is not consistent with the very foundation of the period-color relationship. We have characterized 350 new non-radial pulsating variables such as A- and F-type candidate ? Scuti, ? Doradus and hybrid stars, which increases the known candidate non-radial pulsators in the Kepler field significantly, by ?20%. The relationship between two recently constructed observables, Energy and Efficiency, was also studied for the large sample of non-radial pulsators, which shows that the distribution in the logarithm of Energy (log (En)) can be used as a potential tool to distinguish between the non-radial pulsators, to some extent. Through visual inspection of the light curves and their corresponding frequency spectra, we found 23 new candidate red giant solar-like oscillators not previously reported in the literature. The basic physical parameters such as masses, radii and luminosities of these solar-like oscillators were also derived using asteroseismic relations. 2018, The Author(s).
- Source
- Astrophysics and Space Science, Vol-363, No. 12
- Date
- 2018-01-01
- Publisher
- Springer Netherlands
- Subject
- Stars: oscillations; Stars: rotation, starspots; Stars: variables; Stars: variables: solarlike; Stars: variables: ? Scuti
- Coverage
- Chowdhury S., Nicolaus Copernicus Astronomical Center, Bartycka 18, Warsaw, 00-716, Poland, Department of Physics, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, Karnataka, India, Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263002, India; Joshi S., Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263002, India; Engelbrecht C.A., Department of Physics, University of Johannesburg, PO Box 524, Auckland Park, Johannesburg, 2006, South Africa; De Cat P., Royal Observatory of Belgium, Ringlaan 3, Brussel, 1180, Belgium; Joshi Y.C., Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital, 263002, India; Paul K.T., Department of Physics, CHRIST (Deemed to be University), Hosur Road, Bengaluru, 560029, Karnataka, India
- Rights
- All Open Access; Green Open Access; Hybrid Gold Open Access
- Relation
- ISSN: 0004640X
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Chowdhury S.; Joshi S.; Engelbrecht C.A.; De Cat P.; Joshi Y.C.; Paul K.T., “A study of pulsation & rotation in a sample of A-K type stars in the Kepler field,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/16855.