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The Near Infrared FeH Lines as Indicators of Surface Gravity of M stars

Published online by Cambridge University Press:  25 May 2016

Ricardo Piorno Schiavon  and
Beatriz Barbuy
Ricardo Piorno Schiavon
Affiliation:
Instituto Astronômico Geofísico - USP CP 9638, São Paulo, 01065-970, SP, Brazil [email protected]
Beatriz Barbuy
Affiliation:
Instituto Astronômico Geofísico - USP CP 9638, São Paulo, 01065-970, SP, Brazil [email protected]

Extract

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We compute synthetic spectra in the region around 1 μm, including the Wing-Ford band (WFB) of Iron Hydride (FeH) in the calculations. This band is known to be a good indicator of surface gravities of M stars. Employing Kurucz model atmospheres, we study the response of the intensity of the WFB to atmospheric parameters and check our results against observations of M dwarfs. This study is part of an ongoing project which aims to investigate the M dwarf-to-giant ratio in galaxies, through a population synthesis method, exploring a number of spectral indicators in the near infrared, such as the WFB, the NaI, CaII and CO near infrared features.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 171: New Light on Galaxy Evolution , 1996 , pp. 441
Copyright
Copyright © Kluwer 1996