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Four years of starspot evolution on an active F-type ultra-fast rotator KIC 6791060

Published online by Cambridge University Press:  27 November 2018

Subhajeet Karmakar
Affiliation:
Aryabhatta Research Institute of observational sciencES (ARIES), Manora Peak, Nainital 263002, India
Jeewan C. Pandey
Affiliation:
Aryabhatta Research Institute of observational sciencES (ARIES), Manora Peak, Nainital 263002, India
Igor S. Savanov
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, ul. Pyatniskaya 48, Moscow 119017, Russia
Ashish Raj
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
E. S. Dmitrienko
Affiliation:
Lomonosov Moscow State University, Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow 119234, Russia
Yurij Pakhomov
Affiliation:
Institute of Astronomy, Russian Academy of Sciences, ul. Pyatniskaya 48, Moscow 119017, Russia
D. K. Sahu
Affiliation:
Indian Institute of Astrophysics, Koramangala, Bangalore 560034, India
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Abstract

Using the data obtained from Kepler satellite, we have analyzed an F-type ultra-fast rotator KIC 6791060. We derive a rotational period of 0.34365±0.00004 d. Multiple periodicity with a period separation of ~0.00016 d was detected, which appears to be a result of the relative velocity between the multiple spot-groups in different stellar latitudes due to the surface differential rotation. Modeling of the surface inhomogeneities using the light curve of 3899 epochs shows the evidence of single active longitude region. The active longitude is found to drift along the longitude at a rate similar to the detected period separation of the F-type star. The surface coverage of cool spots is found to be in the range of ~0.07–0.44%. The low value of the spottedness can be interpreted probably due to the thinner convection zone on the F-type star.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

Footnotes

speaker; email: subhajeet09@gmail.com

References

Balona, L. A., 2015, MNRAS, 447, 2714CrossRefGoogle Scholar
Feigelson, E. D., Lawson, W. A., 2004, ApJ, 614, 267CrossRefGoogle Scholar
Høg, E. et al., 2000, A&A, 355, L27Google Scholar
Karmakar, S. et al., 2016, MNRAS, 459, 3112CrossRefGoogle Scholar
Kurucz, R. L., 1992, in IAU Symposium, Vol. 149, The Stellar Populations of Galaxies, Barbuy B., Renzini A., eds., p. 225Google Scholar
Luo, A.-L. et al., 2016, VizieR Online Data Catalog, 5149Google Scholar
Press, W. H., Rybicki, G. B., 1989, ApJ, 338, 277CrossRefGoogle Scholar
Savanov, I. S. et al., 2016, Acta Astron., 66, 381Google Scholar
Savanov, I. S. & Strassmeier, K. G., 2008, Astronomische Nachrichten, 329, 364CrossRefGoogle Scholar
Scargle, J. D., 1982, ApJ, 263, 835CrossRefGoogle Scholar

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