Systems of VO and CaH molecule bands in spectra of spectral type M stars

• Published in: Kinematics and physics of celestial bodies Vol. 31; no. 2; pp. 90 - 99
• Main Authors: Pavlenko, Ya. V., Schmidt, M.
• Format: Journal Article
• Language: English
• Published: New York Allerton Press 01.03.2015; Springer Nature B.V
• Subjects: Astronomy; Astrophysics; Atmosphere; Band spectra; Bands; Energy distribution; Iron; Mathematical models; Molecules; Observations and Techniques; Physics; Physics and Astronomy; Physycs of Stars and Interstellar Medium; Radiation absorption; Red dwarf stars; Spectra; Stars; Stars & galaxies; Spectral Type; Oscillator Strength; Absorption Line; Celestial Body; Band System
• ISSN: 0884-5913; 1934-8401
• DOI: 10.3103/S0884591315020051

Radiation absorption by the CaH and VO molecular band systems in atmospheres of spectral type M dwarf stars is simulated. These bands form visible spectral details. The calculations involve detailed lists of lines calculated by different investigators. For the CaH molecule, we investigated the dependence of the calculated synthetic spectra on the adopted dissociation potential. The energy distributions in spectra of the 2MASS2242-2859 (M5.5 V) and SIPS2039-1126 (M7 IV-V) stars are reproduced. It is shown that the observed energy distributions can be confidently described by theoretical spectra calculated for model atmospheres with T eff /lg g /[Fe/H] = 3000/4.5/0 and 2700/4.5/0, respectively. These estimates are consistent with other known results.