Optical and IUE Spectra of the Planetary Nebula NGC 7026

Details Optical and IUE Spectra of the Planetary Nebula NGC 7026 Optical and IUE Spectra of the Planetary Nebula NGC 7026

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...614..745h&link_type=abstract

The Astrophysical Journal, Volume 614, Issue 2, pp. 745-756.

Astronomy and Astrophysics

Astronomy

9

Ism: Abundances, Ism: Planetary Nebulae: Individual: Ngc Number: Ngc 7026, Plasmas, Ultraviolet: Ism

Scientific paper

We investigated spectroscopic data of the extended planetary nebula NGC 7026 in the wavelengths 3700-10,050 Å, secured with the Hamilton Echelle Spectrograph at Lick Observatory. This optical wavelength spectrum has been analyzed along with the International Ultraviolet Explorer (IUE) UV spectral data. The diagnostic diagram indicates that the planetary nebula has very complex electron densities of Nɛ~3000-10,000 cm-3. The electron temperatures are relatively low: around Tɛ=8000-9500 K, probably as a result of an enhanced heavy elemental cooling. The electron temperature variation also indicates that the low-excitation line region is slightly higher than the high-excitation line regions perhaps as a result of the hardening of escaped UV ionizing photons into the outer shell part of low-excitation lines. We construct a photoionization model, with the central star of the planetary nebula at a temperature of Teff=80,000 K, to fit most of the relatively strong line intensities and the observed physical conditions. With this photoionization model construction and with a semiempirical ionization correction method, we derived the elemental abundances of the nebula. Compared to the average or normal planetary nebula, most elemental abundances of He, C, N, O, Ne, S, Ar, and Cl appear to be enhanced.

Affiliated with

Also associated with

No associations

Rating

Optical and IUE Spectra of the Planetary Nebula NGC 7026 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Optical and IUE Spectra of the Planetary Nebula NGC 7026, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical and IUE Spectra of the Planetary Nebula NGC 7026 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-897757