An Optical Interferometer with Wavelength Dispersion

Details An Optical Interferometer with Wavelength Dispersion An Optical Interferometer with Wavelength Dispersion

1994-04-04

arxiv.org/abs/astro-ph/9404001v1

Astron.Astrophys.290:340,1994

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomy and Astrophysics. (9 pages, uuencoded and compressed PostScript; hardcopy on request fro

Scientific paper

MAPPIT is an optical interferometer installed at the coude focus of the 3.9-m Anglo-Australian Telescope. The instrument combines non-redundant masking with wavelength dispersion and is able to record fringes simultaneously over a wide bandwidth. For typical observations centred near 600 nm, the bandwidth is 55 nm and the spectral resolution is 3 nm. This paper describes the instrument and the data processing methods and presents some results. We find the star sigma Sgr to be a close binary; the system is only partially resolved, with a separation of (11.5 +/- 2) milliarcsec (assuming the components to have equal magnitudes). We also give angular diameter measurements of two red giant stars, alpha Sco and beta Gru. The observations of beta Gru (spectral type M5 III) resolve the star for the first time and give an equivalent uniform-disk diameter of (27 +/- 3) milliarcsec.

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