Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..769l&link_type=abstract
Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 769-777.
Astronomy and Astrophysics
Astrophysics
135
Astrometry, Early Stars, Interstellar Masers, Molecular Clouds, Very Long Base Interferometry, Water Masers, Ammonia, Calibrating, Carbon Monoxide, Continuous Spectra, Hydrogen Ions, Position (Location), Power Spectra
Scientific paper
We report VLBI observations with angular resolution of 0".003 of H2O maser sources associated with Cepheus A, S252A, GL 2789/V645 Cyg, GL 2139, CO 59.79+0.04, W33B, and U Ori. The absolute positions of the masers were measured to an accuracy of 0".3. Positional coincidences were found between two groups of maser spots and two very compact H II regions in Cep A, and between the maser spots and a stellar-like optical image in GL 2789. In the case of Cep A, we found that the line widths of individual maser components varied as the ⅓ power of the flux densities.
Blitz Leo
Lada Charles J.
Moran James Michael
Reid Mark J.
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