NOAO >   Observing Info >   Approved Programs >   2017B-0356

Small NOAO Logo

Program Information for 2017B-0356


PI: Kurtis A Williams, Texas A&M U., kurtis.williams@tamuc.edu
Address: Dept of Physics & Astronomy, PO BOX 3011, COMMERCE, TX 75429 USA

Title: Toward Ensemble Asteroseismology of White Dwarfs in M67

Abstract: Precision asteroseismology of white dwarfs provides valuble insight into the structure of these stellar remnants, and thereby detailed knowledge of the endpoint of stellar evolution. Asteroseismology is a rapidly maturing field, but is hampered by the fact that all known pulsating white dwarfs are field stars. We propose to obtain time series observations that will allow for the detection of ZZ Ceti variable WDs in the open cluster Messier 67; our existing data suggests that 5 to 10 such WDs may exist in the cluster. ZZ Ceti stars identified by this study will be highly valued targets for future asteroseismic studies, in particular allowing for ensemble statistics of WD properties resulting from stars of the same metallicity and progenitor mass. We also identify a likely ZZ Ceti WD that is more massive than the typical M67 WD, suggesting it is a remnant of a blue straggler system. If this star is a pulsating WD, it would be the first known pulsating WD progeny of a blue straggler and allow for comparison of blue straggler remnants with those of single star evolution.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2017B):  LBT-SVC/LBC -- 10hrs


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 >   2017B-0356

noaoprop-help@noao.edu

Small NOAO Logo