NOAO > Observing Info > Approved Programs > 2012A-0161
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NOAO > Observing Info > Approved Programs > 2012A-0161 |
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PI: Mike Reed, Missouri State University, mreed@sdbv.missouristate.edu
Address: Physics Department, 901 S National, Springfield, Missouri 65897, USA
CoI: Andrzej Baran, Missouri State University
CoI: Simon O'Toole, Australian Astronomical Observatory
CoI: John Telting, Nordic Optical Telescope
CoI: Marcus Shadwick, Missouri State University
CoI: Roy Ostensen, KU Leuven
Title: Testing theoretical models of subdwarf B stars using multicolor photometry
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 subdwarfs B (sdB) stars, such identifications using white light photometry currently have significant limitations. We intend to use multicolor photometry to identify pulsation modes and constrain structure models. We propose to observe two pulsating sdB stars: PG1047+003 and PG1325+101. The first object will be observed as part of a multisite campaign (along with WHT and PROMPT). With multicolor photometry, we will use perturbative atmospheric models (BRUCE/KYLIE) 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. In January we have been allocated 7 night on the 2.1 m to collect multicolor data and on the 4 m for time-resolved spectroscopy on J06398+5156, another promising pulsating subdwarf B star for our purposes.
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 > 2012A-0161 |
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