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

作者：Fuhrmann K^*; Chini R; Hoffmeister V H; Stahl O

来源：Monthly Notices of the Royal Astronomical Society, 2011, 416(1): 391-392.

DOI：10.1111/j.1365-2966.2011.19042.x

• blue stragglers
• stars: fundamental parameters
• stars: individual: HR 3220
• stars: solar-type
• white dwarfs

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 tau similar or equal to 3 Gyr evolutionary age compared to its low iron-to-magnesium abundance ratio which implies that HR 3220 must be instead as old as tau similar or equal to 10 Gyr. Our finding is corroborated by the observational constraints of the spectroscopic and astrometric P = 899 d orbit, leading to a secondary mass M-B similar or equal to 0.42(-0.05)(+0.09)M(circle dot) that matches the Rappaport et al. period-white dwarf mass relation and the case of a mass transfer system.

• 出版日期2011-9