Volume 485, Number 3, July III 2008
|Page(s)||L29 - L32|
|Published online||27 May 2008|
Letter to the Editor
BD+43° 3654 – a blue straggler?
Astronomical Institute, Ruhr-University Bochum, Universitätstr. 150, 44780 Bochum, Germany e-mail: firstname.lastname@example.org
2 Sternberg Astronomical Institute, Moscow State University, Universitetskij Pr. 13, Moscow 119992, Russia e-mail: email@example.com
Accepted: 22 May 2008
The astrometric data on the runaway star BD+43° 3654 are consistent with the origin of this O4If star in the center of the Cyg OB2 association, while BD+43° 3654 is younger than the association. To reconcile this discrepancy, we suggest that BD+43° 3654 is a blue straggler formed via a close encounter between two tight massive binaries in the core of Cyg OB2. A possible implication of this suggestion is that the very massive (and therefore apparently very young) stars in Cyg OB2 could be blue stragglers as well. We also suggest that the binary-binary encounter producing BD+43° 3654 might be responsible for ejection of two high-velocity stars (the stripped helium cores of massive stars) – the progenitors of the pulsars B2020+28 and B2021+51.
Key words: stars: kinematics / pulsars: individual: PSR B2020+28 / open clusters and associations: individual: Cyg OB2 / stars: individual: BD+43° 3654
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.