NOAO >   Observing Info >   Approved Programs >   2017A-0273

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Program Information for 2017A-0273


PI: Eric Sandquist, San Diego State U., esandquist@mail.sdsu.edu
Address: Astronomy Department, 5500 Campanile Drive, San Diego, CA 92182 USA

Title: Really Measuring Age and Stellar Masses from a Bright Binary in the Open Cluster Praesepe

Abstract: We request observations to characterize the interferometric orbit of the brightest spectroscopic binary in the young open cluster Praesepe/M44 (age about 600-800 Myr) in order to precisely measure the component star masses. Mass measurements from binary systems are critical to fully understand any aspect of stellar evolution, but when a binary contains an evolved star, the mass, along with other well- determined characteristics like the photometry, can be used to precisely determine age. Praesepe is a nearby, well-studied cluster that has impacted gyrochronology and the white dwarf initial mass-final mass relation, and is one of a few clusters known to harbor planets. With Kepler K2 mission observations of the majority of the cluster now available, Praesepe's influence will grow, and will soon influence giant star asteroseismology as well. The proposed observations would produce underline{precise fundamental stellar mass data} of a kind that is underline{very rarely available} to test our knowledge in many areas of stellar evolution.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  CHARA/Climb -- 20hrs


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NOAO >   Observing Info >   Approved Programs >   2017A-0273

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