NOAO >   Observing Info >   Approved Programs >   2005A-0154

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Proposal Information for 2005A-0154


PI: Mike Reed, SW Missouri State University, mreed@sdbv.smsu.edu
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.


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NOAO >   Observing Info >   Approved Programs >   2005A-0154

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