Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248...72p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 72-80.
Astronomy and Astrophysics
Astrophysics
43
Binary Stars, Pre-Main Sequence Stars, Radial Velocity, Stellar Spectra, Abundance, Chromosphere, Stellar Mass, Stellar Spectrophotometry
Scientific paper
Radial velocity and high-resolution spectroscopy observations are presented of the active binary HD155555 (=V834 Ara, LDS 587 A). The orbital period is redetermined and found to be consistent with that obtained by Bennet et al. (1962). The extremely high Li (6708 A) abundance and the activity level of the optical dMe companion (DS587B) suggest this binary to consist of two pre-main sequence objects, of about 10 to the 7th years old. The activity degree of the components of HD155555 has been computed in the H-alpha and Ca-II K lines. The dMe companion shows strong H-alpha emission, which is highly variable at least on a daily timescale. The LDS587 system does not appear to be directly associated with known stellar forming regions or moving groups. It is not completely unlikely that the system is evolved: in this case the observed high Li content of HD155555 cannot presently be explained; some of the possible mechanisms are discussed but no satisfactory explanation is found.
Cutispoto Giuseppe
Gratton Raffaele
Mayor Marcel
Pasquini Luca
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