Interstellar scattering of OH/IR stars at the Galactic Centre

Details Interstellar scattering of OH/IR stars at the Galactic Centre Interstellar scattering of OH/IR stars at the Galactic Centre

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249p...7v&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, March 1, 1991, p. 7P-10P.

Astronomy and Astrophysics

Astronomy

16

Galactic Nuclei, Hydroxyl Emission, Infrared Stars, Interstellar Gas, Interstellar Masers, Scattering Functions, Milky Way Galaxy, Stellar Spectra, Very Long Base Interferometry, Very Long Baseline Array (Vlba)

Scientific paper

Short VLBI observations, using the new VLBA antennas have been obtained for four OH/IR stars within 15 arcmin of SgrA-asterisk, and it is concluded that these OH masers are severely resolved due to interstellar scattering at the wavelength of 18 cm. This leaves no doubt that the wavelength-squared dependence of the image size of SgrA-asterisk is also due to interstellar scattering. An accurate distance to the Galactic Center cannot be obtained from observations of OH/IR stars close to the Galactic Center.

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