Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397l.115l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 397, no. 2, p. L115-L118.
Astronomy and Astrophysics
Astrophysics
8
Asymptotic Giant Branch Stars, Emission Spectra, Formyl Ions, Planetary Nebulae, Stellar Envelopes, Molecular Ions, Radial Velocity, Toruses
Scientific paper
The J = 1-0 HCO(+) emission from NGC 7027 was observed with the BIMA array. We present the first convincing evidence that the HCO(+) emitting material is distributed in an expanding torus. The spectrum indicates that there are two velocity components: the bulk of the HCO(+) emission arises from material with a projected outflow velocity of about 15 km/s, and there is a higher velocity component presumably due to an inner shell. The observed source size is about 20 x 30 arcsec, the continuum flux density is 4.5 +/- 0.5 Jy, and the peak line flux density is 11.2 +/- 0.9 Jy. The HCO(+) extends relatively far from the central star. Previous observations underestimated the total HCO(+) flux density and emission region size. These results highlight the drawbacks of observing extended sources with large antennas.
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