Discovery of the nearby F6V star HR 3220 as a field blue straggler

Details Discovery of the nearby F6V star HR 3220 as a field blue straggler Discovery of the nearby F6V star HR 3220 as a field blue straggler

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.416..391f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 416, Issue 1, pp. 391-392.

Astronomy and Astrophysics

Astronomy

Blue Stragglers, Stars: Fundamental Parameters, Stars: Individual: Hr 3220, Stars: Solar-Type, White Dwarfs

Scientific paper

We report the discovery of the nearby single-lined and metal-poor F6V star HR 3220 as a field blue straggler from a basic inconsistency of the τ≃ 3 Gyr evolutionary age compared to its low iron-to-magnesium abundance ratio which implies that HR 3220 must be instead as old as τ≃ 10 Gyr. Our finding is corroborated by the observational constraints of the spectroscopic and astrometric P= 899 d orbit, leading to a secondary mass MB≃ 0.42+0.09- 0.05 M&sun; that matches the Rappaport et al. period-white dwarf mass relation and the case of a mass transfer system.

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