NOAO > Observing Info > Approved Programs > 2005A-0154
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NOAO > Observing Info > Approved Programs > 2005A-0154 |
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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.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2005A-0154 |
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