Circumstellar shells of luminous supergiants. I - Carbon monoxide in Rho Cassiopeiae and HR 8752

Astronomy and Astrophysics – Astronomy

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Carbon Monoxide, Infrared Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Supergiant Stars, Atomic Spectra, F Stars, Infrared Astronomy, Line Spectra, Radial Velocity, Stellar Luminosity

Scientific paper

High resolution spectra are presented for the 2.3 micron, CO Delta-v = 2 region in the two F Ia supergiants HR 8752 and Rho Cas, which have extensive circumstellar shells without infrared excesses that indicate circumstellar gas with little dust. The new spectra show strong CO Delta-v = 2 lines of circumstellar origin at kinetic temperatures near 2000 K. The CO line profile in Rho Cas resembles that of the circumstellar component of atomic lines at shorter wavelengths, and a standard model with spherical symmetry and acceleration to the escape velocity gives a lower limit to the rate of mass loss of 0.01 solar masses/year. Infrared CO and visual circumstellar lines in HR 8752 show a progression of line profiles with time over the five-year interval 1975-1979, with the C-12/C-13 ratio being 15 and a photosphere pulsation period of nearly three years.

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