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A photometric study of Slowly Pulsating B Stars.



We present the results of an extended photometric pho·tom·e·try  
n.
Measurement of the properties of light, especially luminous intensity.



photo·met
 study of a sample of Slowly Pulsating B Stars (SPBs.) Our observations were made using the College of Charleston The College of Charleston (CofC) is a public university located in historic downtown Charleston, South Carolina. The College was founded in 1770 and chartered in 1785, making it the oldest college or university in South Carolina, the 13th oldest institution of higher learning in  Automatic Photometric Telescope located at Fairborn Observatory in Washington Camp, AZ. We observed using the technique of differential photometry photometry (fōtŏm`ətrē), branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.  in the Stromgren system. SPBs are hot, young stars that pulsate pul·sate
v.
To expand and contract rhythmically; beat.
 in a complex, nonradial fashion. Because they were discovered only fairly recently, not much data is available on these nonradial pulsators, and the aim of this research is to obtain a better understanding of SPB stars. By analyzing the light variations, the pulsational frequencies can be determined. Comparison with theoretical models enables us to estimate the pulsational mode as well as some physical properties of the star. Our study includes the known SPBs HD138764, HD222555, and HD21071 and the candidate stars HD192660 and HD44112. For the known members we have found one or more frequencies in addition to those determined by previous research. As for the other two candidate stars, we have detected pulsational frequencies which in fact point to classification as an SPB star. In addition to frequency determination, we have also found approximate ages and masses of these stars. * Supported by NSF Grant ast-0071260 as well as funding from NASA NASA: see National Aeronautics and Space Administration.
NASA
 in full National Aeronautics and Space Administration

Independent U.S.
 under the South Carolina Space Grant program.
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Title Annotation:SOUTH CAROLINA ACADEMY OF SCIENCE ABSTRACTS
Author:Andrews, Jennifer; Dukes, Robert
Publication:Bulletin of the South Carolina Academy of Science
Date:Jan 1, 2005
Words:216
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