The high-excitation planetary nebula NGC 6741

Details The high-excitation planetary nebula NGC 6741 The high-excitation planetary nebula NGC 6741

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292...71h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 71

Astronomy and Astrophysics

Astronomy

25

Planetary Nebulae, Astronomical Spectroscopy, Line Spectra, Abundance, Astronomical Models, Interstellar Matter

Scientific paper

The compact, bright Peimbert type I planetary nebula NGC 6741 shows an unusually rich spectrum, which is studied here from 3700 to 10,370 A with the Hamilton Echelle spectrograph at the Lick Observatory. By combining Hamilton Echelle observations with archive UV data secured with the IUE, and with available IR data, we can obtain improved diagnostics and chemical composition of this high-excitation planetary nebula. The diagnostic diagram gives T-epsilon = 12,500 K, N-epsilon = 6300/cu cm for most ions. An improved 'composite' theoretical nebular model is employed. The stellar temperature quoted in the earlier literature seems too high; the highest likely temperature appears to be 140,000 K. Elemental abundances are estimated from ionic concentrations using an ionization correction factor in the usual way, and also from a theoretical model. These different methods show large discordances, implying that one must use great caution in choosing T-epsilon for the determination of the ionic concentrations. For every 10,000 H atoms, there appear to be 8.0 atoms of C, 2.4 of N, 5.4 of O, 1.3 of Ne, 0.068 of S, 0.0023 of Cl, and 0.035 of Ar. NGC 6741 is rich in He, C, and N compared with the solar abundance. O is probably depleted by 'hot bottom' burning.

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