Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241.1014z&link_type=abstract
Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 1014-1020. Research supported by the John S. Guggenheim Memorial Foun
Astronomy and Astrophysics
Astronomy
34
Hydrogen Atoms, Late Stars, Planetary Nebulae, Radio Sources (Astronomy), Centimeter Waves, Continuous Radiation, Red Giant Stars
Scientific paper
With the 1000 foot (305 m) Arecibo antenna, a search was conducted for 21 cm wavelength radiation from atomic hydrogen in expanding envelopes around a total of 13 red giant stars and planetary nebulae. For some stars (e.g., IRC + 10216, IRC + 10011) upper limits on the mass of atomic hydrogen in the circumstellar envelopes are a few percent of the total envelope mass estimated from other considerations. Toward Alpha Ori intense, patchy background emission precludes a definitive estimate of the atomic hydrogen content in the envelope. No 21 cm radiation was detected that is directly associated with the planetary nebulae NGC 6210, NGC 6572, NGC 6720, and NGC 2346. Possible 21 cm absorption of the continuum radiation from NGC 6572 by foreground hydrogen would suggest a distant location for this nebula.
Silverglate Peter
Terzian Ye.
Zuckerman Ben
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