J/PAZh/35/574 He, C, N and O abundances in planetary nebulae (Milanova+, 2009)
He, C, N, and O abundances in an ensemble of Galactic planetary nebulae.
Milanova Yu.V., Kholtygin A.F.
<Pis'ma Astron. Zh. 35, 574 (2009)>
=2009PAZh...35..574M 2009PAZh...35..574M
=2009AstL..35...518M 2009AstL..35...518M
ADC_Keywords: Planetary nebulae ; Abundances
Keywords: Galaxy: evolution, subsystems - Magellanic Clouds -
evolutionary status - planetary nebulae: elemental abundances
Abstract:
The He, C, N, and O abundances in more than 120 planetary nebulae
(PNe) of our Galaxy and the Magellanic Clouds have been redetermined
by analyzing new PNe observations. The characteristics of PNe obtained
by modeling their spectra have been used to compile a new catalog of
parameters for Galactic and extragalactic PNe, which is accessible at
http://www.astro.spbu.ru/staff/afk/GalChemEvol.html. The errors in the
parameters of PNe and their elemental abundances related to
inaccuracies in the observational data have been analyzed. The He
abundance is determined with an accuracy of 0.06dex, while the errors
in the C, N, and O abundances are 0.1-0.2dex. Taking into account the
inaccuracies in the corrections for the ionization stages of the
elements whose lines are absent in the PNe spectra increases the
errors in the He abundance to 0.1dex and in the C, N, and O
abundances to 0.2-0.3dex. The elemental abundances in PNe of various
Galactic subsystems and the Magellanic Clouds have been analyzed. This
analysis suggests that the Galactic bulge objects are similar to type
II PNe in Peimbert's classification, whose progenitor stars belong to
the thin-disk population with ages of at least 4-6Gyr. A similarity
between the elemental abundances in PNe of the Magellanic Clouds and
the Galactic halo has been established.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 58 94 He, C, N, and O abundances in Galactic
planetary nebulae
table6.dat 58 21 He, C, N, and O abundances in PNe of the
Magellanic Clouds
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+, 1992
V/127 : MASH Catalogues of Planetary Nebulae (Parker+ 2006-2008)
Byte-by-byte Description of file: table[36].dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Planetary nebula name
11- 12 I2 --- Ex Excitation class
14- 18 I5 K T0 Electron temperature
20- 24 F5.3 --- t2 Parameter, t2, described amplitude of
fluctuation temperature
26- 34 F9.2 cm-3 ne Electron density
36- 40 F5.2 [---] [He] He abundance, log(N(He)/N(H))+12
42- 46 F5.2 [---] [C] ? C abundance, log(N(C)/N(H))+12
48- 52 F5.2 [---] [N] ? N abundance, log(N(N)/N(H))+12
54- 58 F5.2 [---] [O] O abundance, log(N(O)/N(H))+12
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Table 5: Global parameters of PNe in our Galaxy and the Magellanic Clouds
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Element [X]=log(X/H) + 12
Type <[He]> <[C]> <[N]> <[O]>
kpc solMass
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I 0.23±0.25 0.686±0.081 11.21±0.1 8.32±1.35 8.96±0.66 8.63±0.69
IIa 0.31±0.29 0.638±0.046 11.13±0.09 8.82±0.44 8.73±0.69 8.75±0.33
IIb 0.56±0.36 0.617±0.033 11.03±0.1 8.55±0.4 8.36±0.57 8.53±0.38
III 1.05±1.12 0.599±0.026 10.94±0.27 8.60±0.01 7.92±0.50 8.41±0.30
IV 1.35±0.0 0.588±0.0 11.06±0.06 8.64±0.84 7.98±0.5 8.22±0.36
Bulge 0.56±0.29 0.614±0.03 11.16±0.1 8.74±0.44 8.59±0.59 8.86±0.42
LMC -- -- -- -- 11.02±0.11 8.8 ±0.58 7.49±0.86 8.24±0.55
SMC -- -- -- -- 11.10±0.08 8.98±0.83 8.08±1.03 8.30±0.21
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(End) Yury Pakhomov, Veta Avedisova [INASAN] 29-Dec-2009