The double radio source associated with L1551 IRS 5 - Binary system or ionized circumstellar torus?

Details The double radio source associated with L1551 IRS 5 - Binary system or ionized circumstellar torus? The double radio source associated with L1551 IRS 5 - Binary system or ionized circumstellar torus?

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301l..25r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. L25-L28.

Astronomy and Astrophysics

Astronomy

103

Nebulae, Radio Sources (Astronomy), Stellar Envelopes, Stellar Winds, Astronomical Maps, Carbon Monoxide, Gas Ionization, Shock Waves

Scientific paper

High angular resolution (0.15 arcsec) 2-cm VLA mapping of the L1551 core is reported, and a shock excitation model for the detected radio structures is proposed. It is found that the two unresolved radio sources previously reported (Bieging and Cohen, 1985) are centered in a region of extended (2 x 1 arcsec) emission at 6 cm that may be time variable. It is suggested that the two compact sources previously thought to be stars may be the ionized inner part of a confining torus with radius 25 AU seen in projection, and that the energy source of the system is a star (as yet undetected in the radio) located between the two radio peaks. Explanation for the observed ionization is found in the interaction of a neutral stellar wind with the surrounding torus. The estimated gaseous torus density of n(H2) = 10 to the 10th/cu cm suggests that the torus may be the remnant of a protoplanetary cloud. The CO outflow appears to be different for different size scales, providing evidence that focusing and collimation processes in L1551 may be operating at scales from tens of AU to tenths of pc.

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