THE SPOTTEDNESS OF V775 HER, VS33 TAU, AND YZ CMI FROM LONG-TERM PHOTOMETRIC-OBSERVATIONS

Authors
ALEKSEEV IY BONDAR NI
Citation
Iy. Alekseev et Ni. Bondar, THE SPOTTEDNESS OF V775 HER, VS33 TAU, AND YZ CMI FROM LONG-TERM PHOTOMETRIC-OBSERVATIONS, Astronomy reports, 42(5), 1998, pp. 655-661
Citations number
36
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy reports → ACNP
ISSN journal
10637729
Volume
42
Issue
5
Year of publication
1998
Pages
655 - 661
Database
ISI
SICI code
1063-7729(1998)42:5<655:TSOVHV>2.0.ZU;2-4
Abstract
Photographic measurements and UBVRI photometry are used to calculate t he photospheric spottedness of the three active red dwarf stars V775 H er, V833 Tau, and YZ CMi in the framework of a zonal spot model. The s potted regions can cover large fractions of the stellar surfaces: up t o 42% of V775 Her, 68% of V833 Tau, and 21% of YZ CMi. The differences in the temperatures of the quiescent photosphere and spots are 900, 5 00, and 420 K, respectively.