Query : 2001A&A...377..981W

2001A&A...377..981W - Astronomy and Astrophysics, volume 377, 981-993 (2001/10-3)

Direct multi-wavelength limb-darkening measurements of three late-type giants with the Navy Prototype Optical Interferometer.


Abstract (from CDS):

We present direct measurements of the limb-darkened intensity profiles of the late-type giant stars HR5299, HR7635, and HR8621 obtained with the Navy Prototype Optical Interferometer (NPOI) at the Lowell Observatory. A triangle of baselines with lengths of 18.9m, 22.2m, and 37.5m was used. We utilized squared visibility amplitudes beyond the first minimum, as well as triple amplitudes and phases in up to 10 spectral channels covering a wavelength range of ∼650nm to ∼850nm. We find that our data can best be described by featureless symmetric limb-darkened disk models while uniform disk and fully darkened disk models can be rejected. We derive high-precision angular limb-darkened diameters for the three stars of 7.44mas±0.11mas, 6.18mas±0.07mas, and 6.94mas±0.12mas, respectively. Using the HIPPARCOS parallaxes, we determine linear limb-darkened radii of 114R±13R, 56R±4R, and 98R±9R, respectively. We compare our data to a grid of Kurucz stellar model atmospheres, with them derive the effective temperatures and surface gravities without additional information, and find agreement with independent estimates derived from empirical calibrations and bolometric fluxes. This confirms the consistency of model predictions and direct observations of the limb-darkening effect.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - techniques: high angular resolution - stars: fundamental parameters - stars: atmospheres - stars: late-type

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* BY Boo LP? 14 07 55.7560046 +43 51 16.025944 8.52 6.86 5.28 3.43 1.77 M4.5III 168 0
2 * gam Sge PM* 19 58 45.4286265 +19 29 31.728079 6.97 5.04 3.47 2.27 1.35 M0-III 244 0
3 V* V416 Lac LP* 22 38 37.9229848 +56 47 44.282738   6.684 5.167     M4+III 92 0

    Equat.    Gal    SGal    Ecl

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