Expansion Velocity Investigation of the Elliptical Planetary Nebula NGC 6803

Choi, Younsu Choi; Lee, Seongjae; Hyung, Siek

doi:10.5303/jkas.2008.41.6.163

Cited by 3 publications

(8 citation statements)

References 21 publications

(18 reference statements)

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“…The diagram indicates that the electron temperatures are about T e ∼ 8500−9500 K for most ions, assuming log N e = 4.0. From their 1995 HES data analysis (with a slightly different C parameter), Choi et al (2008) find a similar T e ([O iii]) = 9700 K. Lee et al (1974) derived electron temperatures and densities using their photographic and photoelectric data, Notes. 1995 1 They also derive another electron temperature, T e ∼ 8500 K and log N e = 3.6 from the Balmer jump.…”

Section: Nebular Physical Conditionsmentioning

confidence: 95%

“…The HES spectroscopic observations were carried out with the 3-m telescope at the Lick Observatory on 1995 August 18 (UT) and 2001 August 29 (UT). The detailed description of the HES observations is given in Choi et al (2008), who present the spectral line profiles using the 1995 spectral data for their line A&A 549, A65 (2013) 2000, l = 46.…”

Section: Spectroscopic Datamentioning

confidence: 99%

“…The exposures were 120 and 3 min in 1995, and 60 and 5 min in 2001. The description of the two short exposures given in Choi et al (2008) was wrong (Choi, priv. comm.…”

Section: Spectroscopic Datamentioning

confidence: 99%

“…Lee et al (1974) found C = 0.6 assuming electron temperature, T e = 7500 K, while Zhang et al (2004) derive C = 0.869. Choi et al (2008) assumed C = 0.63 for their line profile study with the 1995 data. From the current combined data set, we adopted a slightly higher value, C = 0.81 or A v = 1.71.…”

Section: Spectroscopic Datamentioning

confidence: 99%

“…It would be more useful if one can find the physical state of this object using highresolution data, e.g., 0.05−0.154 Å available with the Hamilton Echelle Spectrograph (HES) attached to the 3.0-m Shane telescope at the Lick Observatory. Most recently, the spectroscopic line profile analysis has been carried out using HES data by Choi et al (2008). However, the objective of their study was to study the expansion velocity of the shell based on the line profiles of some strong lines.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution spectra of the planetary nebula NGC 6803

Lee

Hyung

2012

A&A

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We present the high-dispersion spectra of the elliptical ring shaped planetary nebula NGC 6803, secured with the Hamilton Echelle Spectrograph attached to the 3-m Shane telescope of Lick Observatory. Numerous lines from neutral to quadruply ionized ions are presented in the wavelength region from 3650 to 9900 Å. We also use the low dispersion UV spectral data obtained with the 60-cm interstellar ultraviolet explorer. In spite of its simplistic symmetrical bilateral shape, the diagnostics imply that the physical condition of the nebular shell is very complex with a huge density range of 1300−80 000 cm −3. A comparison of the 1995 and 2001 [Ar iv] data suggests that the density increase occurred near the inner shell boundary. In spite of a huge ionization potential range, the average electron temperature indicated by primary diagnostic lines is relatively low, i.e., T e ≤ 9500 K, except for [Cl iv], from which we derive a temperature that is around 11 500 K. We derived the chemical abundances of He, C, N, O, Ne, S, Ar, Cl, and K, based on the physical condition suggested by diagnostics and photo-ionization analysis. The chemical abundances of NGC 6803 are mostly enhanced when compared with the average Galactic planetary nebula. The effective temperature of its central star appears to be about 90 000 K and its luminosity about 2400 L , assuming a distance of 3000 pc. The evolutionary track implies that NGC 6803 might have been evolved from a companion star of about 1.0 M in a binary system, or from a single progenitor of about 1.5 M , born in a metal-rich zone near the Galactic plane.

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Section: Nebular Physical Conditionsmentioning

confidence: 95%

Section: Spectroscopic Datamentioning

confidence: 99%

“…The exposures were 120 and 3 min in 1995, and 60 and 5 min in 2001. The description of the two short exposures given in Choi et al (2008) was wrong (Choi, priv. comm.…”

Section: Spectroscopic Datamentioning

confidence: 99%