2005ApJ...634L.169M

Query : 2005ApJ...634L.169M

2005ApJ...634L.169M - Astrophys. J., 634, L169-L172 (2005/December-1)

The dusty AGB star RS CrB: first mid-infrared interferometric observations with the Keck telescopes.

MENNESSON B., KORESKO C., CREECH-EAKMAN M.J., SERABYN E., COLAVITA M.M., AKESON R., APPLEBY E., BELL J., BOOTH A., CRAWFORD S., DAHL W., FANSON J., FELIZARDO C., GARCIA J., GATHRIGHT J., HERSTEIN J., HOVLAND E., HRYNEVYCH M., JOHANSSON E., LE MIGNANT D., LIGON R., MILLAN-GABET R., MOORE J., NEYMAN C., PALMER D., PANTELEEVA T., PAINE C., RAGLAND S., REDER L., RUDEEN A., SALOGA T., SHAO M., SMYTHE R., SUMMERS K., SWAIN M., TSUBOTA K., TYAU C., VASISHT G., WIZINOWICH P. and WOILLEZ J.

Abstract (from CDS):

We report interferometric observations of the semiregular variable star RS CrB, a red giant with strong silicate emission features. The data were among the first long-baseline mid-infrared stellar fringes obtained between the Keck telescopes, using parts of the new nulling beam combiner. The light was dispersed by a low-resolution spectrometer, allowing simultaneous measurement of the source visibility and intensity spectra from 8 to 12 µm. The interferometric observations allow a nonambiguous determination of the dust shell spatial scale and relative flux contribution. Using a simple spherically symmetric model, in which a geometrically thin shell surrounds the stellar photosphere, we find that ∼30% to ∼70% of the overall mid-infrared flux–depending on the wavelength–originates from 7-8 stellar radii. The derived shell opacity profile shows a broad peak around 11 µm (τ≃0.06), characteristic of Mg-rich silicate dust particles.

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Journal keyword(s): Infrared: Stars - Instrumentation: Interferometers - Stars: Individual: Constellation Name: RS Coronae Borealis - Stars: Late-Type

Simbad objects: 6

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Number of rows : 6
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 V* TX Cam Mi* 05 00 51.1627935408 +56 10 54.041462220       14.02   M9-9.5 365 0
2 * eps CrB PM* 15 57 35.2514020181 +26 52 40.366652765 6.650 5.360 4.130 3.27 2.64 K2IIIab 280 1
3 V* RS CrB Mi* 15 58 30.7643738880 +36 01 19.724981484   8.88 7.44     M7 54 0
4 V* RR Sco Mi* 16 56 37.8385882488 -30 34 48.211969260 8.46 7.64 6.10     M6+e 160 0
5 * 39 Cyg SB* 20 23 51.6137972268 +32 11 24.481643174 7.27 5.77 4.44 3.43 2.76 K2.5IIIFe-0.5 147 0
6 * eps Cyg ** 20 46 12.6722768426 +33 58 13.182037125 4.370 3.520 2.480 1.73 1.19 K0III 519 0

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