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

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

2001-08-10

arxiv.org/abs/astro-ph/0108192v1

A&A 377, 981-993 (2001)

Astronomy and Astrophysics

Astrophysics

13 pages, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20011124

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 18.9 m, 22.2 m, and 37.5 m 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 ~650 nm to ~850 nm. 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 7.44 mas +/- 0.11 mas, 6.18 mas +/- 0.07 mas, and 6.94 mas +/- 0.12 mas, respectively. Using the HIPPARCOS parallaxes, we determine linear limb-darkened radii of 114 R$_\odot \pm $13 R$_\odot$, 56 R$_\odot \pm $4 R$_\odot$, and 98 R$_\odot \pm $9 R$_\odot$, 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.

Affiliated with

Also associated with

No associations

Rating

Direct multi-wavelength limb-darkening measurements of three late-type giants with the Navy Prototype Optical Interferometer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Direct multi-wavelength limb-darkening measurements of three late-type giants with the Navy Prototype Optical Interferometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct multi-wavelength limb-darkening measurements of three late-type giants with the Navy Prototype Optical Interferometer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-177630