Optical interferometric measurements of Gamma Cassiopeiae's envelope in the H-alpha line

Details Optical interferometric measurements of Gamma Cassiopeiae's envelope in the H-alpha line Optical interferometric measurements of Gamma Cassiopeiae's envelope in the H-alpha line

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165l..13t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. L13-L15.

Astronomy and Astrophysics

Astrophysics

47

Cassiopeia Constellation, H Alpha Line, Interferometry, Stellar Envelopes, Astronomical Photography, Blue Stars, Limb Darkening, Stellar Luminosity, Variable Stars

Scientific paper

We report observations of ΥCas in the continuum and in the Hα emission line, with the CERGA small interferometer I2T, providing angular resolution down to the milli-arcsecond level. We used a differential method, described by Labeyrie (1982), which measures the modulus and the phase of the object visibility function, in multiple spectral channels. We obtained a 5.2 milli-arcsecond angular diameter for the envelope, and found that the envelope was centered on the star with its red and blue wings symmetrically positioned south and north.

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