Age of the Open Cluster NGC 752 from the Eclipcing Binary DS And.
Abstract
We present a new analysis of the 1.01-day period eclipsing binary star DS And in the nearby open star cluster NGC 752. We have measured high-precision light curves in B, V, R and I filter bands, clearly showing a total secondary eclipse. From a spectral disentangling analysis we also precisely measured the radial velocity variations of both stars using HET HRS spectra. Together these measurements allow us to determine the mass and radius of each star. We find that the primary star has M1=1.76 M⊙ and R1=2.20 R⊙, while the secondary star has M2=1.22 M⊙ and R2=1.20 R⊙. In the color-magnitude diagram of the cluster, the primary star is located at the main sequence turnoff where it is beginning rapid changes after its core hydrogen burning phase. By using the rapid radius change of the more massive star, we will determine an accurate age for the cluster using theoretical stellar models. We gratefully acknowledge support from the NSF under grant AST-1817217.
- Publication:
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American Astronomical Society Meeting Abstracts #234
- Pub Date:
- June 2019
- Bibcode:
- 2019AAS...23430315B