Annotation
Observations of a time series of solar activity indices are compared with new simultaneous observations of the flux variations of the photospheric and chromospheric emissions of 33 stars during the HK project that were conducted over the past 20 years. In addition to the known cyclic chromospheric emissions of stars in the 11-year time scale, which was discovered at the Mount Wilson Observatory and Stanford University, we found a recurrence that is similar to the quasi-biennial variations of solar radiation fluxes. The results of calculations of the of radiation flux variation periods of stars at the quasi-biennial scale are given.
Received: 2010 May 31
Approved: 2011 April 13
PACS:
97.20.Jg Main-sequence: late-type stars
96.60.Mz Photosphere
96.60.Na Chromosphere
96.60.qd Sun spots, solar cycles
96.60.Mz Photosphere
96.60.Na Chromosphere
96.60.qd Sun spots, solar cycles
© 2016 Publisher M.V.Lomonosov Moscow State University
Authors
E.A. Bruevich, E.V. Kononovich
State Astronomical Institute, Moscow, Russia
State Astronomical Institute, Moscow, Russia