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Subhajeet Karmakar & Jeewan Chandra Pandey

An F-type ultra-fast rotator KIC 6791060: Starspot modulation and Flares

(Volume 87 - Année 2018 — Actes de colloques — First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India)
DOI: 10.25518/0037-9565.7619
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Mots-clés : astronomie, astrophysique, étoiles, photométrie, variabilité

Abstract

Making use of the data obtained from Kepler satellite, we have analysed 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 surface differential rotation. During the observations, 38 optical flares are detected. Energies of these flares have been found to be in the range of 1031−33 erg. Preliminary results of surface temperature modeling indicate the existence of two active longitudes on the stellar surface.

Keywords : astronomy, astrophysics, photometry, stars, variability

Pour citer cet article

Subhajeet Karmakar & Jeewan Chandra Pandey, «An F-type ultra-fast rotator KIC 6791060: Starspot modulation and Flares», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 87 - Année 2018, Actes de colloques, First Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - November 2016 - Nainital, India, 163 - 166 URL : https://popups.uliege.be/0037-9565/index.php?id=7619.

A propos de : Subhajeet Karmakar

Aryabhatta Research Institute of observational sciencES (ARIES), Nainital-263002, India, subhajeet@aries.res.in

A propos de : Jeewan Chandra Pandey

Aryabhatta Research Institute of observational sciencES (ARIES), Nainital-263002, India