FM17p.05 — Asteroseismology of GD358 with complex core carbon and oxygen abundance profiles

Date & Time

Aug 10th at 6:00 PM until 6:00 PM

Track

Presentations 

Location

Rating ( votes)

Author(s): Agnes Kim1, Judith Provencal2

Institution(s): 1. Penn State Worthington Scranton, 2. University of Delaware

GD358 is the brightest (mv = 13.7) and best studied helium atmosphere white dwarf pulsator. We present an analysis based on over 1000 hours of observations spanning 2007-2014 as well as archival data going back to 1982. Each modern season of observations was obtained as part of multisite Whole Earth Telescope campaigns (WET). The WET allows continuous coverage of targets over the course of days to weeks. From the complete data set, we identify a total of 27 independent frequencies and fit 15 of them as m=0 modes in our asteroseismic analysis of GD358. As an upgrade to previous analyses of the star, we include complex carbon and oxygen core abundance profiles derived and parameterized from stellar evolution calculations.