A blue depression in the optical spectra of M dwarfs

• Published in: Monthly notices of the Royal Astronomical Society Vol. 523; no. 1; pp. 1297 - 1309
• Main Authors: Jones, Hugh R A, Pavlenko, Yakiv, Lyubchik, Yuri, Bessell, Mike, Allard, Nicole, Pinfield, David J
• Format: Journal Article
• Language: English
• Published: Oxford University Press 23.05.2023
• Subjects: stars: atmospheres; stars: fundamental parameters; line: identification; atomic data; stars: abundances; line: profiles

ABSTRACT A blue depression is found in the spectra of M dwarfs from 4000 to 4500 Å. This depression shows an increase towards lower temperatures, though it is particularly sensitive to gravity and metallicity. It is the single strongest and most sensitive feature in the optical spectra of M dwarfs....