Other
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1762b&link_type=abstract
IUE Proposal ID #BCGDB
Other
Scientific paper
Comparison of 912 -1680A Voyager spectra of the large amplitude Beta Cephei variable BW Vul with model atmosphere spectra has confirmed the known 4200 K effective temperature variation over the 4.8 hour period. Comparisons with about 45 other B star spectra have revealed N II 1085A and Si IV 1400A to be exceptionally strong. C III 977A appears to increase in strength towards minimum light (similar in behavior to C II 6578 and 6582A) while other features appear to vary from cycle to cycle. The continuum analysis to date suggests the star may be adequately modeled as a simple radial pulsator while the line behavior suggests otherwise. We propose to observe BW Vul simultaneously with Voyager and IUE to obtain coverage of more than 90% of the star's flux while avoiding problems with cycle to cycle variability. The broadened wavelength coverage will enable us to determine a relatively precise L Max / L Min value affording a direct comparison of the radial variations determined (1) from this ratio and Stefan's law; (2) directly from the model spectral fits; (3) from integration of the radial velocity curve. The extended continuum data would provide a coherent amplitude-wavelength relation to be compared with the model results. The absorption lines will be studied to look for variations in strength and the line strength anomalies suggested by the present Voyager data.
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