Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..260a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 1, p. 260-264.
Astronomy and Astrophysics
Astronomy
16
H Ii Regions, Planetary Nebulae, Radio Astronomy, Very Large Array (Vla), Continuous Spectra, Interstellar Masers
Scientific paper
This paper reports Very Large Array (VLA) continuum observations at 22, 15, 5, and 1.5 GHz as well as OH maser observations at 1612 MHz of the peculiar, compact nebula K 3-35. The radio continuum maps reveal a poorly resolved, centrally ionized core and a well resolved S-shaped halo which is reminiscent of symmetric outflow. The core's brightness temperature is calculated to lie between 14,000 and 20,000 K, implying that it is a high excitation object. The nebula's appearance at 5GHz is consistent with earlier data, indicating that the nebula has not evolved significantly over a period of about 4 years. All of the observed 1612 MHz line emission lies within 0.5 arcsec of the radio continuum source, leaving little doubt that the two are physically associated. The observed characteristics of K 3-35 favor the far kinematic distance of 9 kpc. The calculated stellar luminosity, ionized mass, core density, and linear size are 10000 solar luminosities, 0.03 solar masses, 7 x 10 exp 4/cu cm, and 0.1 pc, respectively.
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