Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..638l&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 638-650.
Astronomy and Astrophysics
Astronomy
43
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.
Hall Donald N. B.
Hinkle Kenneth H.
Lambert David L.
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