Detection of atomic hydrogen in the young planetary nebula IC 4997

Details Detection of atomic hydrogen in the young planetary nebula IC 4997 Detection of atomic hydrogen in the young planetary nebula IC 4997

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305l..85a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 305, June 15, 1986, p. L85-L88.

Astronomy and Astrophysics

Astronomy

34

Absorption Spectra, Hydrogen Atoms, Planetary Nebulae, Radio Sources (Astronomy), Stellar Envelopes, Lyman Alpha Radiation

Scientific paper

The detection of 21 cm neutral atomic hydrogen in absorption toward the young planetary nebula IC 4997 (PK 58 - 10.1) at the velocity of the approaching edge of the nebular shell is reported. The optical depth of the line is 0.13 + or - 0.02, and the gas is well distinguished from any Galactic H I. The paper derives a nominal mass in neutral hydrogen of 0.001 solar masses and comparable amounts of neutral hydrogen and ionized gas in the nebula.

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