The Dust Distribution Immediately Surrounding V Hydrae

Details The Dust Distribution Immediately Surrounding V Hydrae The Dust Distribution Immediately Surrounding V Hydrae

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011pasp..123.1370t&link_type=abstract

Publications of the Astronomical Society of the Pacific, Volume 123, issue 910, pp.1370-1373

Astronomy and Astrophysics

Astronomy

Stars

Scientific paper

Dust surrounding the star V Hydrae has been measured at a 11.15 μm wavelength using the three-telescope Infrared Spatial Interferometer (ISI). The narrowband heterodyne detection system is tuned to a region free of spectral lines due to molecules surrounding the star, and only continuum radiation from the dust and star is measured. Closure-phase data show that the dust is symmetrically distributed around the star. Results obtained in 2006--2007 are well fitted by a model with a Gaussian intensity distribution with HWHM of 49 mas that contributes 0.52 of the total flux and by a uniform disk of radius 287 mas with a total flux fraction of 0.26; the remaining 0.22 of the total flux is due to the star, which is unresolved. Visibility measurements conducted in 1997 show a substantial difference from those of 2006--2007, indicating that the star was surrounded by more dust in 1997.

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