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Astron. Astrophys. 337, 495-500 (1998)

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A new TiO line list

B. Plez 1, 2

1 Astronomiska Observatoriet, Box 515, S-751 20 Uppsala, Sweden
2 Atomspektroskopi, Fysiska Institution, Box 118, S-221 00 Lund, Sweden (plez@fysik.lu.se)

Received 7 October 1997 / Accepted 19 June 1998

Abstract

A new line list for 9 electronic transitions of TiO ([FORMULA] a-f, and E-B) is presented and made publicly available. It is the latest and much improved version of a suite of TiO line lists inaugurated in Plez et al. (1992). It includes the transition moments of Langhoff (1997) and provides a better match to both high- and low-resolution spectra of cool stars than any previous extensive TiO line list. It is shown to be adequate for most purposes in stellar atmosphere modelling and spectroscopy. The line strengths appear to match observations very well, except for a mismatch of the [FORMULA] band system, when using Langhoff 's transition moment. It appears too strong in the calculations. It would be very valuable to perform accurate lifetime and branching ratios measurements for the [FORMULA] and [FORMULA] transitions.

Key words: molecular data – stars: atmospheres – stars: late-type

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© European Southern Observatory (ESO) 1998

Online publication: August 17, 1998
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