Time series infrared spectroscopy of the Mira variable Chi Cygni

Details Time series infrared spectroscopy of the Mira variable Chi Cygni Time series infrared spectroscopy of the Mira variable Chi Cygni

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...252..697h&link_type=abstract

Astrophysical Journal, Part 1, vol. 252, Jan. 15, 1982, p. 697-714.

Astronomy and Astrophysics

Astrophysics

156

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

Scientific paper

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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