Atomic hydrogen in the planetary nebula IC 4997
1987 ◽
Vol 122
◽
pp. 501-502
Keyword(s):
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.
1989 ◽
Vol 131
◽
pp. 356-356
1987 ◽
Vol 120
◽
pp. 339-340
Keyword(s):
1997 ◽
Vol 180
◽
pp. 475-476
Keyword(s):
2011 ◽
Vol 7
(S283)
◽
pp. 340-341
◽
1969 ◽
Vol 1
(5)
◽
pp. 216-217
Keyword(s):