Evidence for the nearby F4V star λ Ara as a binary system

Details Evidence for the nearby F4V star λ Ara as a binary system Evidence for the nearby F4V star λ Ara as a binary system

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.415.1240f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 415, Issue 2, pp. 1240-1243.

Astronomy and Astrophysics

Astronomy

1

Binaries: Spectroscopic, Stars: Fundamental Parameters, Stars: Individual: Λ Ara, Stars: Solar-Type

Scientific paper

We report on the spectroscopic evidence for the nearby, bright and supposedly single F4V star λ Ara as a binary system. The basic observational tracer is a discrepancy with the Hipparcos-based astrometric surface gravity as opposed to the spectroscopically derived value from the pressure-dependent Mg Ib triplet lines. We demonstrate how this discrepancy can be met with an equal-mass secondary hidden in the light of the star’s considerable projected rotational velocity vsin i = 15.5 ± 1.0 km s-1 and we expect this scenario to be testable with high-angular resolution direct imaging observations. A major consequence should be the discovery of other nearby binary systems with a similar architecture.

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