NOAO > Observing Info > Approved Programs > 2011B-0358
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NOAO > Observing Info > Approved Programs > 2011B-0358 |
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PI: Mike Reed, Missouri State University, mreed@sdbv.missouristate.edu
Address: Physics Department, 901 S. National, Springfield, MO 65897, USA
CoI: Andrzej Baran, Pedagogical University of Krakow
CoI: Simon O'Toole, Australian Astronomical Observatory
CoI: Laurel Farris, Missouri State University
Title: Testing subdwarf B stellar models using multicolor photometry and time- resolved spectroscopy
Abstract:
Pulsating stars allow a direct investigation of their structure and
evolutionary history from the evaluation of pulsation modes. However,
the observed pulsation frequencies must first be identified with
spherical harmonics (modes). For subdwarf B (sdB) stars, such
identifications using white-light photometry currently have significant
limitations. We propose using multicolor photometry combined with time-
resolved spectroscopy to identify pulsation modes and constrain
structure models.
We propose to observe J06398+5156 a newly discovered, bright, high
amplitude and hybrid subdwarf B pulsator. We will measure radial
velocity, effective temperature, and gravity variations produced by the
pulsations. With simultaneous multicolor photometry, we will use
perturbative atmospheric models to identify the pulsation frequencies.
This is part of our NSF grant to obtain seismic tools to test structure
and evolution models, constraining stellar parameters including total
mass, envelope mass, internal composition discontinuities, and internal
rotation.
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 > 2011B-0358 |
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