Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.213..165d&link_type=abstract
In ESA QUASAT: A VLBI Obs. in Space p 165-170 (SEE N85-16700 07-88)
Astronomy and Astrophysics
Astronomy
Interstellar Masers, Protostars, Quasat, Spaceborne Astronomy, Stellar Evolution, Very Long Base Interferometry, Stellar Motions, Stellar Winds, Water Masers
Scientific paper
The use of QUASAT to study H2O masers emitting at millimeter or submillimeter wavelengths from the contracting envelopes of protostellar objects is discussed. Masers may delineate the remnants of disks or filaments from which the star condensed. The H2O masers show the flow zones, collimated by the disks, and are presumably small, high density concentrations, either in the wind itself, or where the wind smashes into stationary, ambient material. The QUASAT baselines are two to five times longer than those in many VLBI maser studies, allowing advances in the mapping of these objects and in the measurement of their proper motions. The positional accuracy will not improve a full factor of five, as the increase in baseline is partially offset by the higher receiver temperature and the smaller collecting area than used in most maser proper motion studies. Its main benefit may be greatly improved coverage.
Downes Dennis
Emerson Darrel T.
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