VLA observations of the Becklin-Neugebauer object, CRL 490, Monoceros R2 IRS 3, M8 E, and CRL 2591

Details VLA observations of the Becklin-Neugebauer object, CRL 490, Monoceros R2 IRS 3, M8 E, and CRL 2591 VLA observations of the Becklin-Neugebauer object, CRL 490, Monoceros R2 IRS 3, M8 E, and CRL 2591

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..552s&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 552-559.

Astronomy and Astrophysics

Astronomy

54

Infrared Stars, Orion Nebula, Radio Astronomy, Antenna Arrays, Hydrogen Clouds, Interferometry, Ionized Gases, Radio Spectra, Stellar Evolution, Telescopes

Scientific paper

With the VLA operating at 6 and 2 cm, we have observed the compact infrared sources BN, CRL 490, and M8 E that have detectable hydrogen emission lines, and Mon R2 IRS 3 and CRL 2591 that do not. Upper bounds for the radio emission of BN and CRL 490 lead to upper bounds for the rad of their ionized cores of 29 AU and 37 AU, respectively, and lower bounds on the electron density within these regions of 107 and ½ × 107 cm-3 3, respectively. We have detected flux in the direction of CRL 2591 and M8 E; we argue that it is most likely that this radio emission originates in an extended envelope of ionized gas associated with these objects. Of the 13 BN-like objects that have been surveyed for hydrogen recombination line radiation, 9 show evidence (either from infrared line observations or radio continuum observations) of ionized gas. Very compact ionized regions thus appear to be commonly associated with these objects.

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