A Method for Internal Calibration of Optical Interferometer Data and Application to the Circumstellar Envelope of γ Cassiopeiae

Details A Method for Internal Calibration of Optical Interferometer Data and Application to the Circumstellar Envelope of γ Cassiopeiae A Method for Internal Calibration of Optical Interferometer Data and Application to the Circumstellar Envelope of γ Cassiopeiae

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aj....125.3378t&link_type=abstract

The Astronomical Journal, Volume 125, Issue 6, pp. 3378-3388.

Astronomy and Astrophysics

Astronomy

9

Stars: Emission-Line, Be, Stars: Individual (Γ Cassiopeiae), Techniques: Interferometric

Scientific paper

We present a technique for calibrating optical long-baseline interferometric observations in which both the calibration corrections and the source characteristics are obtained from the observations of a program star. This calibration can only be applied to certain classes of objects, such as emission-line sources or binary systems, in which the parameters describing the characteristics of the source are orthogonal to the calibration parameters. The technique is applied to observations of γ Cassiopeiae, obtained on four different nights with the Navy Prototype Optical Interferometer, and utilizes measurements obtained simultaneously in many spectral channels covering a wide spectral range, of which only two channels contain a strong signal due to the circumstellar envelope in the Hα emission line. The calibrated observations in Hα show a clearly resolved circumstellar structure. The best-fit elliptical Gaussian model fitted to our observations has ensemble average parameters of 3.67+/-0.09 mas for the angular size of the major axis, 0.79+/-0.03 for the axial ratio, and 32°+/-5° for the position angle, all in good agreement with values reported by previous investigations.

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