PI: Mike Reed, SW Missouri State University, email@example.com
Address: Physics Department, 901 S. National, Springfield, MO 65804, USA
CoI: Simon O'Toole, Dr Remeis-Sternwarte, Bamberg, Germany
CoI: Anna Ulla, Universidade de Vigo, Vigo, Spain
CoI: Uli Heber, Dr Remeis-Sternwarte, Bamberg, Germany
Title: Time series spectroscopy of the pulsating subdwarf B star PG1219+534
Abstract: Pulsating stars allow a direct investigation of their structure and therefore of their evolutionary history, from the evaluation of the pulsation modes. However, the pulsation modes must first be identified with spherical harmonics. For subdwarf B (sdB) stars, such identifications have proven difficult. One solution to this problem is to use a combination of time series spectroscopy and optical photometry. We propose multi-site spectroscopic and photometric observations to accurately measure pulsation velocity, line profile variations, and changes in temperature and gravity due to pulsations of the pulsating sdB star PG1219+534. Once modes are identified, the powerful tools of asteroseismology can be applied to derive stellar parameters such as total mass, envelope mass, composition discontinuities, and rotation rate.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360