Ultraviolet spectrophotometry of some stars in the association Orion OBI

Astronomy and Astrophysics – Astronomy

Scientific paper

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Orion Constellation, Stellar Spectrophotometry, Ultraviolet Astronomy, Spectral Energy Distribution, Stellar Temperature

Scientific paper

Results are presented of measurements of 56 short-wavelength spectra of 22 stars in the association Orion OBI obtained by means of the orbiting observatory Orion-2. The absolute energy distribution in the continua of these stars is also found. Through a comparison between the relative energy distribution in the continuum for stars of the class B in the wavelength range 2150-3700 A and the theoretical model of Van Citters and Morton (1970), the effective temperatures of these stars are determined. It is shown that for some B stars the effective temperatures are higher than expected for their spectral classes. The energy distribution in the ultraviolet for two stars of the class A is found to agree with the models of Kurucz et al. (1974), where allowance is made for blanketing by absorption lines. It is thought that the observed depression in the continuum of these stars can be explained by the blanketing effect.

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