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Physical parameters for three chromospherically active binariesHigh-resolution spectroscopy, photoelectric radial-velocity observations, and uvby photometry are reported for three southern late-type binaries. Data obtained at ESO during 1988 and 1989 are combined with previously published results in extensive tables and graphs and analyzed in detail. HD 57853 is found to be at least a triple system with period 122.2 d and components of strongly differing luminosity; the primary component rotates rapidly (v sin i = 22 km/sec) and has an age of about 80 Myr. HD 114630 comprises two components of equal mass (at least 1.07 solar mass) and luminosity, with orbital inclination about 90 deg, period 4.23 d, rotation v sin i = about 17 km/sec, and age about 2 Gyr. HD 119285 has rotational period 12.031 d, with a K2IVe primary rotating at v sin i = 6.5 km/sec and a very low-mass secondary; its X-ray surface flux is estimated as 5.5 x 10 to the 6th erg/sq cm sec.
Document ID
19910025664
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Saar, S. H.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Nordstrom, B.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Andersen, J.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA; Universitetets Astronomiske Observatorium, Tollose, Denmark)
Date Acquired
August 14, 2013
Publication Date
August 1, 1990
Publication Information
Publication: Astronomy and Astrophysics
Volume: 235
Issue: 2-Jan
ISSN: 0004-6361
Subject Category
Astrophysics
Accession Number
91A10287
Funding Number(s)
CONTRACT_GRANT: NAGW-112
Distribution Limits
Public
Copyright
Other

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