Evidence for strong activity in population II binaries

Details Evidence for strong activity in population II binaries Evidence for strong activity in population II binaries

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249l..23p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. L23-L26.

Astronomy and Astrophysics

Astrophysics

12

Binary Stars, H Alpha Line, Late Stars, Line Shape, Stellar Activity, Emission Spectra, Main Sequence Stars, Stellar Magnetic Fields

Scientific paper

Observational evidence for rather strong activity in 4 short period population II binaries is presented. All the sample stars show Ca II core emission and filled-in H-alpha profiles and at least one was detected in X-rays by the Rosat satellite, being the first population II coronal source ever detected. It is argued that binarity is the key parameter enhancing the activity in these objects; results corroborate that the active stars recently found in the core of M 15 are binaries. Activity may influence the determination of some of the stellar physical parameters and various implications are discussed.

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