Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005coska..35...23z&link_type=abstract
Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 35, no. 1, p. 23-34.
Astronomy and Astrophysics
Astronomy
1
Late-Type Stars, Activity, Spots
Scientific paper
We report on a search for activity-induced variability in the SB2 systems AR Lac, KT Peg and KZ And as well as in the SB1 systems II Peg and EI Eri in the September 1997 season. The study of Hα line profiles, Na I 5889Angstrom doublet, Ca II IRT lines and TiO 7055Angstrom absorption band is presented. The spot properties were estimated for the systems AR Lac and II Peg. The former possesses spots at intermediate stellar latitudes on the primary component while the latter shows these surface inhomogeneities at low latitudes. In both cases, the spots cooler than the surrounding photosphere were revealed. Significant variability in the hydrogen Hα line profile was observed on II Peg and EI Eri, and the evidence of a rotational modulation was found in KT Peg and II Peg.
Amado Pedro J.
Djurasevic Gojko
Messina Sergio
Oliveira Maria Joao
Zboril Milan
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