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Time series infrared spectroscopy of the Mira variable Chi Cygni
Hinkle, K. H.; Hall, D. N. B.; Ridgway, S. T.
AA(Kitt Peak National Observatory, Tucson, AZ), AB(Kitt Peak National Observatory, Tucson, AZ), AC(Kitt Peak National Observatory, Tucson, AZ)
Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 697-714. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Infrared Spectra, Mira Variables, Shock Wave Propagation, Stellar Envelopes, Stellar Spectra, Time Series Analysis, Variable Stars, High Resolution, Photosphere, Radial Velocity, Shock Fronts, Spectrum Analysis, Stellar Structure
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An analysis is made of a time series of 32 high-resolution infrared spectra spanning more than three cycles of the S-type Mira variable Chi Cygni. Most of the spectra are of the 1.6-2.5 micron region; five are of a narrow region at 4.6 microns. Using information derived from the delta v = 1, 2, and 3 vibration-rotation bands of CO, it is shown that Chi Cygni is characterized by a regularly pulsating photosphere and a complex, circumstellar envelope. Velocities, excitation temperatures, and column densities derived from the CO delta v = 3 bands around 1.6 microns reveal that the photometric variability is associated with an outwardly propagating wave. Probably driven by a general stellar oscillation, this wave traverses the photosphere during the premaximum and maximum phases. The structure of the circumstellar envelope is seen as dominated by a stationary layer that is inferred from its 800 K temperature to be at a distance of the order of 10 stellar radii from the photosphere.

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