Physics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985naan.rept.....b&link_type=abstract
Final Report, 1984 - 1985 Naval Academy, Annapolis, MD.
Physics
Cosmic Dust, Emission Spectra, High Temperature Gases, Shell Stars, Stars, Stellar Spectra, Absorption Spectra, Broadband, Optical Filters, Photoelectricity, Stellar Luminosity, Stellar Spectrophotometry, Ultraviolet Filters, Ultraviolet Spectra, Visible Spectrum
Scientific paper
This project investigated the association of dust with shell stars. Shell stars are identified by emission lines in their spectra, which have been produced in a shell of hot gas surrounding the star. Additional observed properties have indicated the presence of dust, but the direct association of dust with individual shell stars has not been demonstrated conclusively. The first phase of this project was designed to show the presence of dust around the two shell stars, and the second phase investigated their variability. The technique used for both phases was photoelectric photometry. Two sets of filters, broad band and narrow band, were used, in two photometers. The color index obtained from the broad band filters can detect the effects of dust on the star's light and, when compared to neighboring stars, can show whether the dust is directly associated with the star. Variability was searched for, using both sets of filters. AB Aurigal was not found to have a significant amount of circumsteller dust, but FS Canis Major has a strong indication of circumsteller dust and its observed variability has been shown to be a result of its circumsteller dust shell and not any variation of its actual physical properties.
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