The two micron spectrum of R Scuti

Details The two micron spectrum of R Scuti The two micron spectrum of R Scuti

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........4m&link_type=abstract

Ph.D. Thesis Wyoming Univ., Laramie.

Physics

Atomic Spectra, Carbon Monoxide, Escape Velocity, Hydroxyl Emission, Kinematics, Losses, Mass Flow, Molecular Spectra, Stellar Envelopes, Variable Stars, Stellar Evolution, Stellar Mass Ejection, Stellar Spectra

Scientific paper

High-resolution two micron spectrograms of R Scuti, the brightest RV Tauri variable, were obtained to study the mass loss rate and the kinematics of the star's circumstellar material. These observations include atomic lines as well as molecular bands of CO, H2O and OH. There are four major results of this research. (1) The atomic velocities execute a continuous velocity curve with a period of 145 days, twice the period of the discontinuous velocity curve determined from the visible spectrum. (2) The star is surrounded by two circumstellar layers. One is at a temperature of 2200K and is falling toward the star at 13 Km/s. The second is at 1000K and is stationary. The mass of the infalling layer is about 10 to the -5 power solar mass. The stationary shell is a factor of ten larger. (3) Atomic and molecular emission are visible in most of the spectra, apparently originating in an extended envelope surrounding the star. This envelope is at approximately 3000K and contains 3 x 10 to the -7 power solar mass. (4) There are occasional outbursts during which material is expelled from the star at less than escape velocity. This material presumably fuels both the infalling layer of CO and the circumstellar emission.

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