Discovery of radio brightening in AFGL 618

Details Discovery of radio brightening in AFGL 618 Discovery of radio brightening in AFGL 618

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247l..67k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 247, July 15, 1981, p. L67-L71.

Astronomy and Astrophysics

Astronomy

62

Infrared Astronomy, M Stars, Planetary Nebulae, Radio Sources (Astronomy), Stellar Envelopes, Stellar Evolution, Antenna Arrays, Centimeter Waves, Cosmic Dust, H Ii Regions, Hydrogen Ions, Microwave Spectra, Molecular Clouds, Optical Thickness, Radio Astronomy

Scientific paper

Recent radio continuum observations of AFGL 618 have shown that the free-free emission flux density has increased by approximately a factor of two over a 2-3 year interval, whereas the spectrum has remained optically thick up to at least 12 GHz. This is interpreted as the result of expansion of a compact H II region within the molecular/dust envelope of AFGL 618. The central star of the nebula is likely to be a 1 solar-mass star now rapidly evolving into the planetary nebula stage.

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