Investigating Dynamical Formation Scenarios for an Interesting Binary in Open Cluster NGC 6819

Details Investigating Dynamical Formation Scenarios for an Interesting Binary in Open Cluster NGC 6819 Investigating Dynamical Formation Scenarios for an Interesting Binary in Open Cluster NGC 6819

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5834g&link_type=abstract

American Astronomical Society, AAS Meeting #211, #58.34; Bulletin of the American Astronomical Society, Vol. 39, p.839

Astronomy and Astrophysics

Astronomy

Scientific paper

Through our WIYN Open Cluster Study of the spectroscopic binary population for the intermediate-age open cluster NGC 6819, we discovered an interesting binary (WOCS ID 3002). The primary star lies within the red clump of NGC 6819. It has a radius of 16 solar radii and a mass of 1.6 solar masses. The binary system has a circular orbit, a period of 17.7 days, and a semi-major axis of 0.182 AU with a minimum secondary star mass of 0.97 solar masses. Due to the small semi-major axis, the primary star could not have existed in its current binary system during its evolution up the giant branch. We suggest a possible formation scenario, hypothesizing that the primary star exchanged into a previously existing binary through a dynamical interaction.
We tested this hypothesis using the N-body computer modeling program FEWBODY (Fregeau et al. 2004, MNRAS). Specifically, we explored the parameter space of an encounter between a single horizontal-branch star (i.e., the present primary star) and a binary system, seeking to both exchange the single star into the binary and produce the observed orbital parameters (after tidal circularization). We found that NGC 6819 - 3002 can be formed in this way. Importantly, though, the additional requirement that the product binary remain bound to the cluster substantially reduced the available parameter space for this creation path. We determined that only a very small percentage ( 0.1%) of the parameter space explored with FEWBODY could produce NGC 6819 - 3002.
NMG was supported by the REU and ASSURE programs through NSF award AST-0453442. MAD, EKB, AMG, and RDM are supported by NSF award AST-0406615.

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