Intrinsic Ultraviolet (912--3200 Angstrom ) Energy Distribution of OB Stars
Longo, Renata; Stalio, Roberto; Polidan, Ronald S.; Rossi, Lucio
Italy, United States
Abstract
Low-dispersion 500-3200-A spectra of 20 OB stars are used to derive three individual extinction curves in the wavelength range 912-1200 A. The dependence of the intrinsic UV fluxes of OB stars on both spectral type and luminosity is demonstrated. UV color indices are proposed. The results confirm the previous finding that O star spectra are not significantly bluer than the spectrum of the B0 main-sequence star Upsilon Ori.