We introduce a new color index consisting of two spectral band width to measure TiO absorption band strength centered at 567 nm. Based on the most up-to-date line list for TiO we regenerate a grid of synthesized spectra and investigate the temperature sensitivity of the index. The new index behave similar to older Wing TiO-index where itdecreas emonotonically from coolest atmosphere with Teff =2800 up to Teff =4000 where the TiO molecules disassociate. To further examine the feasibility of the new index we reproduce the calibration using a list of observed high resolution spectra and found similar results. This index extend TiO absorption band capability to measure effective temperature of late K to M stars to visual spectrum where it is more accessible to small telescopes for long term dedicated observation.
Cite
@article{arxiv.1612.08298,
title = {A New Titanium Oxide Index in Visual Band},
author = {Bahar Bidaran and Mohammad Taghi Mirtorabi and Fatemeh Azizi},
journal= {arXiv preprint arXiv:1612.08298},
year = {2016}
}