Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...411..477k&link_type=abstract
Astronomy and Astrophysics, v.411, p.477-480 (2003)
Astronomy and Astrophysics
Astrophysics
Planetary Nebulae: General, Planetary Nebulae: Individual: K1-9
Scientific paper
The object K1-9 with strong [N Ii] emission lines was included in the Perek and Kohoutek Catalogue of Planetary Nebulae, but later it was considered to be an H Ii region. Our results show that in addition to the low-excitation emissions there are He Ii and [O Iii] emission lines in its spectrum, and the effective temperature of the central star is more than 54 000 K. Thus we conclude that K1-9 is indeed a planetary nebula. Distribution of [O Iii] and [N Ii] emission lines reflect a ring-like structure with a clear minimum in the centre of the nebula. Hydrogen lines almost fail to show the central gap. K1-9 has the backward proper motion with systemic velocity RV = 60.2 km s-1. The central hydrogen component moves relative to the nebula with a pecular velocity of about -50 km s-1.
Denissyuk Eduard K.
Kondratyeva L. N.
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