NOAO >   Observing Info >   Approved Programs >   2017A-0338

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Program Information for 2017A-0338


PI: Jeff Cummings, Johns Hopkins U., jcummi19@jhu.edu
Address: Department of Physics and Astronomy, Charles and 34th Street, Bloomberg Center, Baltimore, MD, 21218 USA

CoI: Jason Kalirai, STScI
CoI: Douglas P Geisler, Universidad de Concepcion
CoI: Pier-Emmanuel Tremblay, University of Warwick
CoI: Francesco Mauro, Universidad de Concepcion
CoI: Aaron Dotter, Harvard U.
CoI: Charlie Conroy, Harvard U.
CoI: Constantine Deliyannis, Indiana U.

Title: The Initial-Final Mass Relation: An Ultramassive White Dwarf in the Open Cluster M7

Abstract: Spectroscopic analysis of white dwarfs is a proven technique to establish log g, temperature, mass, and cooling age. For remnants that are members of star clusters, a comparison of the white dwarf's cooling age to the cluster turnoff age provides the lifetime and initial mass of the white dwarf's progenitor. Using this novel technique in the very rich and young cluster M7, we propose to observe a newly discovered white dwarf consistent with very high mass (~1.25 Msun) and membership. A white dwarf in the star cluster M7 is ideal for this study given the cluster is nearby, well studied, and young, which is crucial for providing a precise progenitor mass for this ultramassive white dwarf member. This work will further constrain both the high-mass end of the initial-final mass relation and the critical mass that separates quiescent stellar evolution into a white dwarf from evolution into a violent Type II SNe. This limit is very poorly measured yet is crucial for predicting chemical evolution and energetics in star forming regions and galaxies as a whole.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017A):  GEM-SQ/GMOSS -- 6.5hrs band 2 (GS-2017A-Q-50)


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2017A-0338

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