Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...355..720p&link_type=abstract
Astronomy and Astrophysics, v.355, p.720-724 (2000)
Astronomy and Astrophysics
Astrophysics
5
Ism: Planetary Nebulae: Individual:, Ultraviolet: Stars, Stars: Binaries: Close, Stars: Evolution, Stars: Emission-Line, Be, Stars: Agb And Post-Agb
Scientific paper
The UV spectrum of PC 11 is found to show variations in the strength of the O III] 1666Ä , N III] 1750Ä and C III] 1909Ä emission lines. The detection of continuum emission in the wavelength interval 2650Ä to 3200Ä indicates that the central star of PC 11 has an early F-type dwarf companion. The very low level of UV continuum in the wavelength interval 1150Ä to 1900Ä and the non-detection of the central star in the UV images recently taken with HST suggest that the hot whitedwarf or sub-dwarf like central star may be obscured by a dusty disk. The variations in the UV emission lines observed during the period 1987 to 1994 may be the consequence of variable emission coming from high-velocity jet-like emission visible in optical images also taken with HST in the light of [O III]. Based on our UV observations, we confirm our identification of PC 11 as a planetary nebula with a close binary central star. Adopting the absolute magnitude of a F0V companion yields a distance of 485 pc to PC 11. If we assume a typical expansion velocity of 12.5 km s-1 and considering the observed angular diameter of the nebula (4.1''), we find the age of PC 11 to be 376 years. The AGB phase of evolution of the central star seems to have been terminated only recently. Based on observations obtained with the International Ultraviolet Explorer, retrieved from the IUE Final Archive at VILSPA and on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data Archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555
de Martino Domitilla
Garcia-Lario Pedro
Parthasarathy Mudumba
Pottasch Stuart R.
Surendiranath R.
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