Time series infrared spectroscopy of Mira variables. II - CO (second overtone) eight Mira variables and one SRa variable

Details Time series infrared spectroscopy of Mira variables. II - CO (second overtone) eight Mira variables and one SRa variable Time series infrared spectroscopy of Mira variables. II - CO (second overtone) eight Mira variables and one SRa variable

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apjs...56....1h&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 56, Sept. 1984, p. 1-17.

Astronomy and Astrophysics

Astrophysics

110

Infrared Spectroscopy, Infrared Stars, Mira Variables, Stellar Atmospheres, Stellar Oscillations, Stellar Spectra, Variable Stars, Interstellar Masers, Photosphere, Radial Velocity, Semiregular Variable Stars, Shock Waves, Stellar Composition, Stellar Temperature, Time Series Analysis

Scientific paper

The CO second overtone lines have been analyzed in time series spectra of nine long-period variables. The CO lines sample deep photospheric layers. Velocity, temperature, and column density derived from these lines are presented for each star as a function of phase. These data show that the photometric and spectroscopic variability of Mira variables is associated with an outwardly propagating wave, driven by a general stellar oscillation. This wave traverses the deep photosphere as a shock. The program stars have periods ranging from 293 to 445 days and visual amplitudes from 2 to 8 mag. Eight stars are Mira-type variables. Among the Mira variables, the behavior of velocity, temperature, and column density with phase are similar, yet differences do exist from star to star, demonstrating that a family of objects has been sampled. One of the program stars, X Oph, is a semiregular (SRa) long-period variable. This star is undergoing stellar oscillations similar to those of the Mira variables, but with a lower amplitude. Implications of the observations for the origin of the SiO maser are discussed.

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