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Proceedings Paper

H-alpha observations using closure phases at the NPOI
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Paper Abstract

We have enhanced the spectral resolution of the Navy Prototype Optical Interferometer (NPOI) at the H-alpha line to 3 nm (FWHM). We use customized filters that suppresses light in the ~600-725 nm window except for light at the H-alpha wavelength (656.3 nm). The bands shortward of 600 nm and longward of 725 nm are used for fringe tracking and for calibrating the system fringe visibility. We have used these filters to observe H-alpha emission from circumstellar material around Be stars. Closure phases from our initial observations of the Be star zeta Tau with three array elements suggest that the H-alpha emission is not centered on the star. We will show these three-element results, as well as recently-acquired data from the NPOI using 4, 5, and 6 stations.

Paper Details

Date Published: 20 October 2004
PDF: 8 pages
Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004); doi: 10.1117/12.555221
Show Author Affiliations
G. Charmaine Gilbreath, U.S. Naval Research Lab. (United States)
Thomas A. Pauls, U.S. Naval Research Lab. (United States)
J. Thomas Armstrong, U.S. Naval Research Lab. (United States)
David Mozurkewich, Seabrook Engineering (United States)
James H. Clark III, U.S. Naval Research Lab. (United States)
Robert B. Hindsley, U.S. Naval Research Lab. (United States)
Donald J. Hutter, U.S. Naval Observatory (United States)

Published in SPIE Proceedings Vol. 5491:
New Frontiers in Stellar Interferometry
Wesley A. Traub, Editor(s)

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