Abstract Details
| Name: Sowgata Chowdhury Affiliation: Christ University Conference ID: ASI2016_461 Title : Pulsation and Rotation of A-K type stars in the Kepler field Authors and Co-Authors : Sowgata Chowdhury, Student, Department of Physics, Christ University Dr. Santosh Joshi, Scientist D, ARIES, Nainital Dr. Yogesh C. Joshi, Scientist D, ARIES, Nainital Prof. K. T. Paul, Professor, Christ University Prof. C. A. Engelbrecht, Professor, University of Johannesburg, South Africa Abstract Type : Poster Abstract Category : Stars, The Milky Way Galaxy and its neighbours Abstract : We present the results of time-series photometric analysis of about 15000 A-K type stars observed by the Kepler space mission. We measured starspot rotation periods of 2373 active stars as a function of spectral type and also discuss the distribution of their amplitudes. We examined the period-color relationship for all the Kepler field rotational variables ranging from spectral type K7 to A0 and interestingly found that the same relationship holds true for both early-F and A type stars. This result is not consistent with the very foundation of the PtM relationship. Through visual inspection of the light curves and their corresponding frequency spectra, we identified 16 stars with solar-like oscillations that had previously been classified in the literature as red giants. In addition, we found 71 new candidate 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. We have characterized several non-radial pulsating variables such as δ Sct, γ Dor and hybrid stars. The relationship between two newly constructed observables, ’Energy’ and ’Efficiency’ was also studied for the large sample of non-radial pulsators. Our results also support the idea that the present observational instability strip should be extended to accommodate the newly discovered pulsators. |