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16 April 2024 |
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The K-band intensity profile of R Leonis probed by VLTI/VINCI | | D. Fedele
; M. Wittkowski
; F. Paresce
; M. Scholz
; P.R. Wood
; S. Ciroi
; | | Date: |
5 Nov 2004 | | Subject: | astro-ph | | Affiliation: | 3 and 4), P.R. Wood , S. Ciroi ( Dipartimento di Astronomia, Universita’ di Padova, ESO, Institut fur Theoretische Astrophysik der Universitat Heidelberg, School of Physics, University of Sydney, Research School for Astronomy and Astrophysi | | Abstract: | We present near-infrared K-band interferometric measurements of the Mira star R Leonis 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 $sim$ 0.08 and $sim$ 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 +/- 0.4 mas and 26.2 +/- 0.8 mas 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}_{-40}R$_odot$ and 320^{+50}_{-40}R$_odot$, and to effective temperatures of 2930 +/- 270K and 3080 +/- 310K, respectively. | | Source: | arXiv, astro-ph/0411133 | | Services: | Forum | Review | PDF | Favorites | |
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