Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l.135b&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L135-L139.
Astronomy and Astrophysics
Astrophysics
64
Absorption Spectra, Carbon Monoxide, Infrared Absorption, Stellar Envelopes, Stellar Spectra, Supergiant Stars, Molecular Spectra, Radial Velocity, Spectral Bands, Stellar Mass Ejection
Scientific paper
First observations of circumstellar absorption lines of the 1-0 vibration rotation band of CO in the 4.6-micron spectrum of the M supergiant Alpha Orionis are reported. Components are distinguished at the two distinct radial velocities observed in the K I 7699-A line, and rotational temperatures of 200 (+50, -10) K and 70 (+ or - 10) K are derived, along with (C-12)(O-16) column densities of 4.7 x 10 to the 17th per sq cm and 1.2 x 10 to the 16th per sq cm for the components expanding at 11 km/s and 18 km/s, respectively. Weak (C-13)(O-16) features are positively identified in the lower-velocity component, tentatively in the higher, confirming the photospheric origin of the expanding matter. It is found that C-12/C-13 is approximately equal to 6 in both components.
Bernat Andrew P.
Hall Donald N. B.
Hinkle Kenneth H.
Ridgway Stephen T.
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