High spatial resolution infrared imaging of L1551-IRS 5 - Direct observations of its circumstellar envelope

Details High spatial resolution infrared imaging of L1551-IRS 5 - Direct observations of its circumstellar envelope High spatial resolution infrared imaging of L1551-IRS 5 - Direct observations of its circumstellar envelope

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327..870m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 327, April 15, 1988, p. 870-875.

Astronomy and Astrophysics

Astronomy

27

Early Stars, Infrared Astronomy, Pre-Main Sequence Stars, Stellar Envelopes, Astronomical Maps, Carbon Monoxide, Light Scattering, Molecular Clouds, Polarization Characteristics

Scientific paper

The authors have obtained images of L1551-IRS 5 at 1.65, 2.2, and 3.8 μm using the University of Rochester's Infrared Array Camera. They find that IRS 5 is spatially resolved, and that it is elongated: the observed FWHM size of IRS 5 is 4.1×2.8 arcsec2 at 2.2 μm. These observations are interpreted in terms of a flattened circumstellar envelope that is viewed from about 18° above its equatorial plane, a configuration that has been treated theoretically by Lefévre et al. (1983). The authors deduce that the envelope has a diameter of 1000 AU, a molecular hydrogen density of greater than or approximately equal to 4×106 cm-3, and a mass of greater than or approximately equal to 0.02 M_sun;, which results in an extinction of AV≥ 33 mag to the central source. The direction of elongation is ≡135° which is roughly parallel to the position angle of the infrared polarization and perpendicular to the CO outflow and to the optical jet associated with IRS 5. This is discussed, and the authors' model also explains qualitatively the large infrared polarization.

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