Light Curve Solutions for Eclipsing Binaries in NGC 188

Details Light Curve Solutions for Eclipsing Binaries in NGC 188 Light Curve Solutions for Eclipsing Binaries in NGC 188

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ap%26ss.235..149b&link_type=abstract

Astrophysics and Space Science, Volume 235, Issue 1, pp.149-160

Astronomy and Astrophysics

Astrophysics

2

Open Clusters, Eclipsing Binaries

Scientific paper

We present light curve solutions for the W UMa-type eclipsing binaries EP, EQ, ER, ES, and V369 Cep in the old open cluster NGC 188. Using light curve solution parameters combined with reasonable mass estimates, we determine the distance modulusV-M vof the cluster. Our aim is to examine if current uncertainties in the cluster's distance and age can be resolved. Three binaries yield distance moduli close to 10{./m}80 (±0{./m}08), two others give values around 11{./m}40(±0{./m}09). Depending on the amount of reddening, we find a weighted mean distance modulus for all five binaries between 11{./m}01 and 11{./m}05 (±0{./m}06), which lends modest support for the lower distance (1.65 kpc) and older age (10 Gyr) of the cluster.

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