Physics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..291s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 291-304. Research supported by the Carlsbergfondet
Physics
24
Binary Stars, Chromosphere, Stellar Activity, Stellar Physics, Radial Velocity, Starspots, Stellar Models, Stellar Orbits, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
High-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.
Andersen Jeppe J.
Nordstrom Birgita
Saar Steven H.
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