NOAO >   Observing Info >   Approved Programs >   2015A-0411

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Program Information for 2015A-0411


PI: Katelyn E Milliman, U. of Wisconsin, Madison, milliman@astro.wisc.edu
Address: Astronomy Department, 465 N. Charter Street, Madison, Wisconsin 53706 USA

CoI: Aaron M Geller, Northwestern U.
CoI: Emily Leiner, U. of Wisconsin, Madison
CoI: Robert D Mathieu, U. of Wisconsin, Madison
CoI: Benjamin M Tofflemire, U. of Wisconsin, Madison

Title: A Radial Velocity Study of Anomalous Stars in Old Open Cluster NGC 6791

Abstract: The origin of anomalous stars that do not follow standard stellar evolution pathways, such as blue stragglers and sub-subgiants, has been an enduring challenge to explain. In star clusters these systems have been shown to be closely linked to the binary-star population with both blue stragglers and sub-subgiants having a high frequency of binary companions. We propose to measure radial velocities and complete orbital solutions for the blue stragglers and sub-subgiants in the old metal-rich open cluster NGC 6791 (8 Gyr, [Fe/H]= +0.30). These observations will more than double the known orbital parameters for cluster sub-subgiants and help form the observational basis for a rigorous theoretical investigation into the formation channel for sub- subgiants being led by Dr. Aaron Geller and involving Emily Leiner.

Program Type: WTAC

Scheduled Nights:
Run 1 (2015A):  WIYN/HYDR -- 4.5n on May 24 - May 25 2015, May 28 2015, Jul 02 - Jul 05 2015, Jul 30 - Jul 31 2015
Run 1 (2015B):  WIYN/HYDR -- 1n on Aug 01 - Aug 02 2015


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NOAO >   Observing Info >   Approved Programs >   2015A-0411

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