Analysis of magnetic activity of the rapidly rotating stars He 373 and AP 225 |
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| Authors: | A I Kolbin V V Tsymbal |
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| Institution: | 1.Kazan (Volga Region) Federal University,Kazan,Russia;2.Crimean Federal University,Simferopol,Russia |
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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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