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Enhanced Stellar Activity for Slow Antisolar Differential Rotation
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Colorado, USA.ORCID iD: 0000-0002-7304-021X
Number of Authors: 22018 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 855, no 2, article id L22Article in journal (Refereed) Published
Abstract [en]

High-precision photometry of solar-like members of the open cluster M67 with Kepler/K2 data has recently revealed enhanced activity for stars with a large Rossby number, which is the ratio of rotation period to the convective turnover time. Contrary to the well established behavior for shorter rotation periods and smaller Rossby numbers, the chromospheric activity of the more slowly rotating stars of M67 was found to increase with increasing Rossby number. Such behavior has never been reported before, although it was theoretically predicted to emerge as a consequence of antisolar differential rotation (DR) for stars with Rossby numbers larger than that of the Sun, because in those models the absolute value of the DR was found to exceed that for solar-like DR. Using gyrochronological relations and an approximate age of 4 Gyr for the members of M67, we compare with computed rotation rates using just the B - V color. The resulting rotation-activity relation is found to be compatible with that obtained by employing the measured rotation rate. This provides additional support for the unconventional enhancement of activity at comparatively low rotation rates and the possible presence of antisolar differential rotation.

Place, publisher, year, edition, pages
2018. Vol. 855, no 2, article id L22
Keywords [en]
stars: activity, stars: late-type, stars: magnetic field, starspots
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-154720DOI: 10.3847/2041-8213/aab20aISI: 000427499600002OAI: oai:DiVA.org:su-154720DiVA, id: diva2:1195354
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2019-12-12Bibliographically approved

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