An Updated Wing TiO Sensitive Index for Classification of M-Type Stars
F.Azizi, M.T.Mirtorabi
TL;DR
This paper refines the Wing TiO sensitive index by updating its continuum band-passes, leading to more accurate temperature measurements of cool giant stars through near-infrared photometry.
Contribution
It introduces an updated TiO index with new continuum band-passes that are free from molecular absorption, improving temperature calibration accuracy.
Findings
New continuum band-passes are free from molecular absorption.
The updated TiO-index shows less scatter in temperature measurements.
A calibration between TiO-index and effective temperature is established.
Abstract
By careful searching of synthetic and observed spectra in a sample of cool giant and supergiant stars, we have updated the continuum band-passes of near-infrared Wing three filter system. This photometric system measures the strength of Titanium Oxide (TiO) absorption in Near-Infrared (NIR) at 719 nm. We show that new reference continuum band-passes are essentially free from molecular absorptions and the updated TiO-index defines the temperature variation in a sample of cool giants with less scatter. A TiO-index vs. effective temperature calibration is derived based on new continuum band-passes.
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