Stellar and Molecular Radii of a Mira Star: First Observations with the Keck Interferometer Grism

Details Stellar and Molecular Radii of a Mira Star: First Observations with the Keck Interferometer Grism Stellar and Molecular Radii of a Mira Star: First Observations with the Keck Interferometer Grism

2006-11-09

arxiv.org/abs/astro-ph/0611312v1

Astrophys.J.654:L77-L80,2007

Astronomy and Astrophysics

Astrophysics

12 pages, including 3 figures. Accepted by ApJL

Scientific paper

10.1086/510717

Using a new grism at the Keck Interferometer, we obtained spectrally dispersed (R ~ 230) interferometric measurements of the Mira star R Vir. These data show that the measured radius of the emission varies substantially from 2.0-2.4 microns. Simple models can reproduce these wavelength-dependent variations using extended molecular layers, which absorb stellar radiation and re-emit it at longer wavelengths. Because we observe spectral regions with and without substantial molecular opacity, we determine the stellar photospheric radius, uncontaminated by molecular emission. We infer that most of the molecular opacity arises at approximately twice the radius of the stellar photosphere.

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