Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003an....324..527z&link_type=abstract
Astronomische Nachrichten, Vol. 324, Issue 6, p. 527-531
Astronomy and Astrophysics
Astronomy
6
Stars: Activity, Stars: Late-Type, Stars: Spots
Scientific paper
We report on a photometric study of the flare M4.5 dwarf YZ CMi as based on photoelectric observations from the seasons 1972/73, 1979/80 and 1996/97. We suggest spot activity to explain the light and colour curves. Spots are generally 500K cooler than the surrounding photosphere and there are basically two solutions available for the observations: high latitude spot changing slightly basic properties such as radius and latitude or active near-equatorial (belt-like) centers represented by three spots. However, the activity centers changed in longitudes (˜180o). The typical spot coverage (inclination i=60o) is 10-15% and 5% for the season 1996/97 or ˜25% for the stellar inclination i=75o. As a by-product, V curve and (V-I) and (V-K) indexes turn out to be most promising in modelling of M-type stars as far as present calibrations are concerned.
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