Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-25
Astrophys.J. 624 (2005) 988-1002
Astronomy and Astrophysics
Astrophysics
37 pages, including 4 figures and 13 tables, accepted to the Astrophysical Journal
Scientific paper
10.1086/429366
Using previous measurements and quantum chemical calculations to derive the molecular properties of the TiH molecule, we obtain new values for its ro-vibrational 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 $\sim$0.52 \mic, 0.94 \mic, and in the $H$ band may be more easily measureable than heretofore thought. The recent possible identification in the L subdwarf 2MASS J0532 of the 0.94 \mic 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.
Jr.
Bauschlicher Charles W.
Bernath Peter F.
Burrows Adam
Dulick Michael
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