Infrared spectroscopy of Mira variables. I - R Leonis: The CO and OH vibration-rotation overtone bands

Abstract

view Abstract Citations (127) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Infrared spectroscopy of Mira variables. I. R Leonis: the CO and OH vibration-rotation overtone bands. Hinkle, K. H. Abstract Infrared spectroscopy of the pulsating Mira variable R Leonis in the region from 1.6 to 2.5 microns is analyzed. Central depths, equivalent widths, and radial velocities are determined for the strong low-excitation lines of the OH first overtones and the CO first and second overtones observed in the spectra. The examined IR spectrum of R Leo is found to be composite, containing lines from two distinct regions of the stellar atmosphere. A 'cool component' is identified with an approximately 1000-K gas layer with a velocity amplitude of about 16 km/s and a mass of no more than 0.001 solar mass; it is suggested that the cool-component lines are likely to originate in a section of the circumstellar shell close to the star. 'Warm-component' lines are shown to have an excitation temperature of approximately 3500 K and a probable origin in the stellar photosphere, which would be characterized by a velocity amplitude of about 35 km/s during the light cycle. Publication: The Astrophysical Journal Pub Date: February 1978 DOI: 10.1086/155897 Bibcode: 1978ApJ...220..210H Keywords: Infrared Spectroscopy; M Stars; Mira Variables; Stellar Radiation; Stellar Spectra; Variable Stars; Abundance; Radial Velocity; Stellar Atmospheres; Stellar Envelopes; Astrophysics; Atmospheres:Mira Variables; Infrared Spectra:Mira Variables; Mira Variables:Radial Velocities full text sources ADS | data products SIMBAD (6) Related Materials (2) Part 2: 1979ApJ...227..923H Part 3: 1979ApJ...234..548H