Non--Local Thermodynamic Equilibrium Effects of TI i in M Dwarfs and Giants

Details Non--Local Thermodynamic Equilibrium Effects of TI i in M Dwarfs and Giants Non--Local Thermodynamic Equilibrium Effects of TI i in M Dwarfs and Giants

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...488..428h&link_type=abstract

Astrophysical Journal v.488, p.428

Astronomy and Astrophysics

Astronomy

28

Molecular Processes, Radiative Transfer, Stars: Late-Type

Scientific paper

We present detailed NLTE Ti I calculations in model atmospheres of cool dwarf and giant stars. A fully self-consistent NLTE treatment for a Ti I model atom with 395 levels and 5279 primary bound-bound transitions is included, and we discuss the implication of departures from LTE in this atom for the strengths of Ti I lines and TiO molecular bands in cool star spectra. We show that in the atmospheric parameter range investigated, LTE is a poor approximation to Ti I line formation, as expected from the low collisional rates in cool stars. The secondary effects of Ti I overionization on the TiO number density and the TiO molecular opacities, however, are found to be negligible in the molecular line-forming region for the relatively small parameter range studied in this paper.

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