Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.296..564v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 296, Issue 3, pp. 564-568.
Astronomy and Astrophysics
Astronomy
10
Ism: Abundances, Planetary Nebulae: Individual: Kjpn 8
Scientific paper
Flux-calibrated low-resolution spectra covering the optical wavelength range from 3400 to 7500 Angstroms have been obtained over the central region and the surroundings of the extraordinary planetary nebula (PN) KjPn 8 (PNG 112.5-00.1). The spectrum from the core is of low excitation with T_e(NII)=8000K and n_e(SII)=550cm^-3. KjPn 8 is found to be a Type I PN according to the original classification scheme of Peimbert & Torres-Peimbert, with enriched He/H and N/O ratios with respect to mean values for PN. Increased O/H, Ne/H and Ar/H ratios over those of average PN reflect the possible metal-rich environment from which the progenitor star formed, and also are similar to those found in the extreme Type I PN He 2-111. The N/H ratio is found to be only moderately high compared to the average PN and consequently, the large O abundance pulls the N/O ratio towards the lower limit of the criterion for Type I planetary nebulae (PNe) in this case. In addition, the spectra of some knots and faint regions in the KjPn 8 surroundings are presented, which show only a few spectral lines. Low electron densities ranging from 100 to 300cm^-3 have been derived in these outer regions.
Kingsburgh Robin L.
Lopez Jose Alberto
Vazquez Ruben
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