Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-05
Astronomy and Astrophysics
Astrophysics
8 pages, 5 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20042013
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.
Ciroi Stefano
Fedele Davide
Paresce Francesco
Scholz Marek
Wittkowski Markus
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