Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..336c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 336-352. NSF-supported research.
Astronomy and Astrophysics
Astronomy
41
Nebulae, Radio Sources (Astronomy), Stellar Evolution, Visible Spectrum, Astrometry, Astronomical Maps, Carbon Monoxide, Charge Coupled Devices, Emission Spectra, Gas Flow, Polarization Characteristics, Spectral Energy Distribution, Stellar Spectrophotometry
Scientific paper
We present new, deep optical CCD images of the young stellar object GL 490. A large-scale diffuse cone of emission extends out to 0.8 pc from the source itself and generally corresponds to the blueshifted part of the bipolar CO outflow. The core image of GL 490 is easily resolved, with a core size of 700-1000 AU and a full image diameter of at least 9", or 9000 AU. This image is elongated in a direction orthogonal to the CO outflow and the cone of optical emission. Also presented is a 2 cm radio continuum map of the source obtained at the VLA, which, when combined with existing observations (giving Sv ∝ v1.2), indicates the presence of a very dense core (ne > 106 cm-3) and thin extended emission covering some 3". Astrometry of the optical image centroid shows it to be displaced 1"5 to the southwest of the radio center, in the direction of the blueshifted CO outflow and the cone of optical emission. A scattering mechanism is proposed to account for the observed optical image of GL 490; this model is found to be consistent with the high polarization previously measured for the source, the large optical image size compared to that in the near infrared, the variation in implied extinction at different wavelengths, and the displacement between the optical and radio centroids. The model is complicated, however, by the radio image orientation and the polarization position angle, neither of which match the orthogonality of the other angles.
Campbell Bel
McGregor Peter J.
Persson Eric S.
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