Evidence from Michelson interferometry for small-scale structure in the source geometry of the M0 giant Beta Andromedae

Details Evidence from Michelson interferometry for small-scale structure in the source geometry of the M0 giant Beta Andromedae Evidence from Michelson interferometry for small-scale structure in the source geometry of the M0 giant Beta Andromedae

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...358..617d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 358, Aug. 1, 1990, p. 617-621.

Other

14

Andromeda Constellation, Giant Stars, Late Stars, M Stars, Michelson Interferometers, Stellar Structure, Companion Stars, Near Infrared Radiation, Power Spectra, Spatial Distribution, Interferometry, Stars: Individual (Β And), Stars: Late-Type

Scientific paper

We report near-infrared measurements of the amplitude visibility function of the nearby M0 giant β And which shows evidence for a complex source structure discovered by ground-based Michelson optical interferometry.
The one-dimensional spatial power spectrum of the star has been measured at selected frequencies in the range 60120 arcsec-1 with accuracy good enough to reveal a spectral flattening between ˜80 and 120 arcsec-1, where the zero point and the secondary maximum should be yielded. The observations do not indicate any time evolution over a 4 yr period.
The spectral distortion can be readily accounted for by a two-component source model, assuming the secondary to be a faint small-scale structure. The set of the model-fitting solutions for the free parameters is combined with available information from empirical effective temperature scales for achieving the most likely values: φ ≃ 13.7 mas S ≃ 0.07, and p ≃ ±8.1 mas of the primary angular size, the contribution of the secondary to the total flux and the projected north-south separation between the sources, respectively. With no other information now available, the structure is merely interpreted as an infrared companion.

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