Chowdhury S, Joshi S, Engelbrecht CA, De Cat P, Joshi YC, Paul KT. A study of pulsation & rotation in a sample of A-K type stars in the
Kepler field.
ASTROPHYSICS AND SPACE SCIENCE 2018;
363:260. [PMID:
30595606 PMCID:
PMC6280877 DOI:
10.1007/s10509-018-3480-1]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 11/27/2018] [Indexed: 06/09/2023]
Abstract
UNLABELLED
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 δ Scuti, γ 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.
ELECTRONIC SUPPLEMENTARY MATERIAL
The online version of this article (10.1007/s10509-018-3480-1) contains supplementary material, which is available to authorized users.
Collapse