2007ApJ...654L..77E

Query : 2007ApJ...654L..77E

2007ApJ...654L..77E - Astrophys. J., 654, L77-L80 (2007/January-1)

Stellar and molecular radii of a Mira star: first observations with the Keck interferometer grism.

EISNER J.A., GRAHAM J.R., AKESON R.L., LIGON E.R., COLAVITA M.M., BASRI G., SUMMERS K., RAGLAND S. and BOOTH A.

Abstract (from CDS):

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 to 2.4 µm. Simple models can reproduce these wavelength-dependent variations using extended molecular layers, which absorb stellar radiation and reemit 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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Journal keyword(s): Stars: Circumstellar Matter - Instrumentation: Interferometers - Stars: AGB and Post-AGB - stars: individual (R Virginis) - Techniques: Interferometric - Techniques: Spectroscopic

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 10994 * 01 48 54.2736385056 +41 16 33.516747336   10.50 8.87     K5 5 0
2 * c Vir RG* 12 20 20.9813922197 +03 18 45.255217001 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 380 0
3 V* R Vir Mi* 12 38 29.9338039680 +06 59 19.028080356 10.26 9.04 7.48 5.62 3.91 M3.5-7e 209 0
4 * 37 Vir * 12 51 36.8896297464 +03 03 24.432220836   7.327 6.003     K2III 35 0

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