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Atomic hydrogen in the planetary nebula IC 4997

Published online by Cambridge University Press:  04 August 2017

C. Giovanardi ,
D.R. Altschuler ,
S.E. Schneider  and
P.R. Silverglate
C. Giovanardi
Affiliation:
Osservatorio Astrofisico di Arcetri Largo E. Fermi 5, I-50125 Firenze, Italy
D.R. Altschuler
Affiliation:
Dept. of Physics, University of Puerto Rico Rio Piedras, 0093l Puerto Rico and Max-Planck-Institut für Radioastronomie Auf dem Hügel 69, D-5300 Bonn 1, F.R.G.
S.E. Schneider
Affiliation:
Dept. of Astronomy, University of Virginia Charlottesville, VA 22903, U.S.A.
P.R. Silverglate
Affiliation:
Perkin-Elmer Corporation, Danbury, CT 06810, U.S.A.

Extract

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In the course of a sensitive search for atomic hydrogen emission associated with planetary nebulae having high velocities relative to Galactic HI (Schneider et al. 1986), we detected absorption in the spectrum of IC 4997 (PK 58-10.1). This is only the second definite detection of HI associated with a PN. The velocity of the feature coincides precisely with that expected if the gas is expanding with the measured optical expansion velocity of 14 km s−1 (Sabbadin 1984), strongly suggesting an association.

Type
Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 501 - 502
Copyright
Copyright © Reidel 1987 

References

Altschuler, D.R., Schneider, S.E., Giovanardi, C., Silverglate, P.R.: 1986, Astrophys. J. Lett. 306, (in press) Google Scholar
Milne, D.K., Aller, L.H.: 1975, Astron. Astrophys. 38, 183 Google Scholar
Sabbadin, F.: 1984, Astron. Astrophys. Suppl. 58, 273 Google Scholar
Schneider, S.E., Silverglate, P.R., Altschuler, D.R., Giovanardi, C.: 1986, (in preparation).Google Scholar