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- W2022178854 abstract "Observations of the hydrogen-deficient supergiant R CrB were obtained with the IUE over an interval of 54 days in order to study the nature of this star's irregular, small-amplitude variations in light. By chance, the series of observations coincided with a dip in the light intermediate between the normal fluctuations and the deep declines associated with the formation of an obscuring dust cloud. High-resolution spectra have been used to search for radial velocity variations, while low-resolution spectra yield ultraviolet light curves down to 1810 A. Both types of spectra have been analyzed for indications of temperature changes. It is found that a combination of photospheric temperature variation and variable extinction is necessary to account for the details of the observations. A simple, ad hoc, periodic model is presented in which the amount of obscuring dust varies in proportion to the drop in temperature, but at a later time, reproduces the wavelength dependence of both the amplitudes and phase shifts of the light curves. The radial velocities are consistent with pulsation being responsible for the temperature variation." @default.
- W2022178854 created "2016-06-24" @default.
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- W2022178854 date "1988-05-01" @default.
- W2022178854 modified "2023-09-26" @default.
- W2022178854 title "Ultraviolet spectroscopy of R Coronae Borealis" @default.
- W2022178854 doi "https://doi.org/10.1086/166331" @default.
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