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Analysis of magnetic activity of the rapidly rotating stars He 373 and AP 225

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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 H α 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.

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Authors and Affiliations

  1. Kazan (Volga Region) Federal University, ul. Kremlevskaya 18, Kazan, 420008, Russia

    A. I. Kolbin

  2. Crimean Federal University, pr. Akademika Vernadskogo 4, Simferopol, 295007 Republic of Crimea, Russia

    V. V. Tsymbal

Authors
  1. A. I. Kolbin
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  2. V. V. Tsymbal
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Correspondence to A. I. Kolbin.

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Original Russian Text © A.I. Kolbin, V.V. Tsymbal, 2017, published in Astronomicheskii Zhurnal, 2017, Vol. 94, No. 6, pp. 524–536.

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Kolbin, A.I., Tsymbal, V.V. Analysis of magnetic activity of the rapidly rotating stars He 373 and AP 225. Astron. Rep. 61, 521–532 (2017). https://doi.org/10.1134/S1063772917060063

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  • DOI: https://doi.org/10.1134/S1063772917060063

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