Binarity as the solution to the stellar evolution enigma posed by NGC 6791
Solar and Stellar Astrophysics
2017-05-31 v1
Abstract
Binary evolution is investigated as the source for the extreme horizontal branch (EHB) stars in the old and metal rich open cluster NGC~6791. Employing an updated version of our binary stellar evolution code we demonstrate that EHB stars naturally emerge from the common envelope phase. In sum, the binary model reproduces the observed (, ) and temporal properties of the EHB over-density tied to NGC 6971, without needing an ad-hoc and anomalous mass-loss prescription.
Cite
@article{arxiv.1705.01776,
title = {Binarity as the solution to the stellar evolution enigma posed by NGC 6791},
author = {Giovanni Carraro and Omar G. Benvenuto},
journal= {arXiv preprint arXiv:1705.01776},
year = {2017}
}
Comments
9 pages, 5 eps figures, accepted for publication in the Astrophysical Journal Letters