Analysis of magnetic activity of the rapidly rotating stars He 373 and AP 225
- Authors: Kolbin A.I.1, Tsymbal V.V.2
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Affiliations:
- Kazan (Volga Region) Federal University
- Crimean Federal University
- Issue: Vol 61, No 6 (2017)
- Pages: 521-532
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/190827
- DOI: https://doi.org/10.1134/S1063772917060063
- ID: 190827
Cite item
Abstract
Spectroscopic and photometric data for the two rapidly rotating members of the α Persei cluster He 373 and AP 225 are analyzed. Improved estimates have been obtained for the projected equatorial rotation velocities: v sin i = 164 km/s for He 323 and v sin i = 129 km/s for AP 225. Multi-band photometric mapping is used to map the spot distributions on the surfaces of the two stars. The fractional spotted areas S and mean temperature difference ΔT between the unspotted photosphere and the spots are estimated (S = 7% and ΔT = 1000 K for He 373; S = 9% and ΔT = 800 K for AP 225). The Hα line profiles of both stars have variable emission components whose widths are used to deduce the presence of extended regions of emission reaching the corotation radius.
About the authors
A. I. Kolbin
Kazan (Volga Region) Federal University
Author for correspondence.
Email: kolbinalexander@mail.ru
Russian Federation, ul. Kremlevskaya 18, Kazan, 420008
V. V. Tsymbal
Crimean Federal University
Email: kolbinalexander@mail.ru
Russian Federation, pr. Akademika Vernadskogo 4, Simferopol, 295007 Republic of Crimea
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