Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291l..45w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 291, April 15, 1985, p. L45-L50. Research supported
Astronomy and Astrophysics
Astrophysics
46
Galactic Nuclei, Hydroxyl Emission, Infrared Stars, Interstellar Masers, Milky Way Galaxy, Star Distribution, Gas Expansion, Radial Velocity, Stellar Envelopes
Scientific paper
A search for OH/IR stars close to the Galactic center has been initiated using the VLA at 18 cm. Thirty-three stars were found in a 34 x 34 arcmin field centered on Sgr A West. The strong concentration toward the galactic plane and the bulk rotation around the nucleus reported by Habing et al. in 1983 in a 2 deg field around the Galactic center are confirmed, but the random motion with a dispersion of 60 km/s in the radial direction is less than half the value found by them. The circumstellar shell expansion velocities are higher than found at larger distances from the Galactic center, suggesting a relatively more massive population of stars near the nucleus or a more efficient conversion of radiation pressure to bulk motion of the circumstellar gas. The OH/IR stars are strongly concentrated toward the continuum source Sgr A West, suggesting a pronounced increase in the density of stars toward the Galactic center.
Baud B.
Habing Harm J.
Matthews Henry E.
Olnon F. M.
Winnberg Anders
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