2005A&A...431.1019F


Query : 2005A&A...431.1019F

2005A&A...431.1019F - Astronomy and Astrophysics, volume 431, 1019-1026 (2005/3-1)

The K-band intensity profile of R Leonis probed by VLTI/VINCI.

FEDELE D., WITTKOWSKI M., PARESCE F., SCHOLZ M., WOOD P.R. and CIROI S.

Abstract (from CDS):

We present near-infrared K-band interferometric measurements of the Mira star RLeonis obtained in April 2001 and January 2002 with the VLTI, the commissioning instrument VINCI, and the two test siderostats. These epochs correspond to near-maximum stellar variability phases ∼0.08 and ∼1.02 (one cycle later), respectively. The April 2001 data cover a range of spatial frequencies (31-35 cycles/arcsecond) within the first lobe of the visibility function. These measurements indicate a center-to-limb intensity variation (CLV) that is clearly different from a uniform disk (UD) intensity profile. We show that these measured visibility values are consistent with predictions from recent self-excited dynamic Mira model atmospheres that include molecular shells close to continuum-forming layers. We derive high-precision Rosseland diameters of 28.5±0.4mas and 26.2±0.8mas for the April 2001 and January 2002 data, respectively. Together with literature estimates of the distance and the bolometric flux, these values correspond to linear radii of 350+50–40R and 320+50–40R, and to effective temperatures of 2930±270K and 3080±310K, respectively.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - stars: late-type - stars: AGB and post-AGB - stars: atmospheres - stars: fundamental parameters - stars: individual: R Leo

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * ups Cet PM* 02 00 00.3091617 -21 04 40.194571 7.45 5.58 4.02 2.76 1.72 M0III 98 0
2 * omi Cet Mi* 02 19 20.79210 -02 58 39.4956   7.63 6.53 5.03   M5-9IIIe+DA 1490 0
3 V* S Ori Mi* 05 29 00.8923286472 -04 41 32.762469480   10.44 7.20     M6.5-7.5e 195 0
4 * alf Hya * 09 27 35.24270 -08 39 30.9583 5.14 3.42 1.97 0.93 0.16 K3IIIa 419 0
5 V* R Leo Mi* 09 47 33.4839808805 +11 25 43.823283729 9.22 8.94 7.53 3.39 0.12 M7-9e 893 1
6 * tet Cen PM* 14 06 40.94752 -36 22 11.8371 3.94 3.04 2.05 1.29 0.76 K0-IIIb 247 0
7 * del Oph PM* 16 14 20.73853 -03 41 39.5612 6.30 4.34 2.75 1.46 0.43 M0.5III 352 0

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2022.09.26-03:25:47

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