Spectroscopic constants, abundances, and opacities of the TiH molecule

Adam S. Burrows, M. Dulick, C. W. Bauschlicher, P. F. Bernath, R. S. Ram, C. M. Sharp, J. A. Milsom

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Using previous measurements and quantum chemical calculations to derive the molecular properties of the TiH molecule, we obtain new values for its rovibrational constants, thermochemical data, spectral line lists, line strengths, and absorption opacities. Furthermore, we calculate the abundance of TiH in M and L dwarf atmospheres and conclude that it is much higher than previously thought. We find that the TiH/TiO ratio increases strongly with decreasing metallicity, and at high temperatures can exceed unity. We suggest that, particularly for subdwarf L and M dwarfs, spectral features of TiH near ∼0.52 and 0.94 μm and in the H band may be more easily measurable than heretofore thought. The recent possible identification in the L subdwarf 2MASS J0532 of the 0.94 μm feature of TiH is in keeping with this expectation. We speculate that looking for TiH in other dwarfs and subdwarfs will shed light on the distinctive titanium chemistry of the atmospheres of substellar-mass objects and the dimmest stars.

Original languageEnglish (US)
Pages (from-to)988-1002
Number of pages15
JournalAstrophysical Journal
Volume624
Issue number2 I
DOIs
StatePublished - May 10 2005

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Infrared: stars
  • Stars: atmospheres
  • Stars: fundamental parameters
  • Stars: low-mass, brown dwarfs
  • Subdwarfs

Fingerprint Dive into the research topics of 'Spectroscopic constants, abundances, and opacities of the TiH molecule'. Together they form a unique fingerprint.

  • Cite this

    Burrows, A. S., Dulick, M., Bauschlicher, C. W., Bernath, P. F., Ram, R. S., Sharp, C. M., & Milsom, J. A. (2005). Spectroscopic constants, abundances, and opacities of the TiH molecule. Astrophysical Journal, 624(2 I), 988-1002. https://doi.org/10.1086/429366