The Dust Distribution Immediately Surrounding V Hydrae
- Creators
- Townes, C. H.
- Wishnow, E. H.
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Ravi, V.
Abstract
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.
Additional Information
© 2011. The Astronomical Society of the Pacific. Received 2011 March 24; accepted 2011 October 24; published 2011 November 11. W. Fitelson, D.D.S. Hale, A.A. Chandler, R.L. Griffith, and K. Tatebe provided excellent technical and observing support for the measurements. We also appreciate the comments of an anonymous referee. This work made use of data from the American Association of Variable Star Observers (AAVSO), the All Sky Automated Survey (ASAS), and the SIMBAD database. We gratefully acknowledge support from the National Science Foundation, The Gordon and Betty Moore Foundation, and the Office of Naval Research.Attached Files
Published - Townes_2011_PASP_123_1370.pdf
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Additional details
- Eprint ID
- 96708
- Resolver ID
- CaltechAUTHORS:20190625-125513602
- NSF
- Gordon and Betty Moore Foundation
- Office of Naval Research (ONR)
- Created
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2019-06-26Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field