Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385l..41y&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. L41-L44. Research supported by Alfred P. Sl
Physics
53
Astronomical Models, Bow Waves, Galactic Nuclei, Shock Waves, Stellar Winds, Supergiant Stars, Interstellar Gas, Ionized Gases, Stellar Envelopes, Stellar Mass Ejection, Stellar Physics, Very Large Array (Vla)
Scientific paper
New structural details of ionized gas associated with IRS 7, a mass-losing supergiant near the Galactic center, are reported, and radio continuum and theoretical maps are compared. High-resolution multiconfiguration VLA observations of IRS 7 reveal ionized gas with a bow shock structure at a wavelength of 2 cm. The apex of the bow shock is facing more toward the cluster of blue stellar objects, known as IRS 16, than Sgr A*, the compact nonthermal source near the Galaxy's dynamical center. It is inferred that the shape of the mass-losing envelope of IRS 7 is influenced by Galactic winds from IRS 16. It is concluded from a comparison of the morphology of the ionized envelope of IRS 7 with simple theoretical modeling of the bow shock structure that the shape of the shock results from the collision between the Galactic center and stellar winds rather than from the motion of IRS 7 through the interstellar medium.
Melia Fulvio
Yusef-Zadeh Farhad
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