J/A+A/332/721 Planetary nebulae abundances (Perinotto+ 1998)
The chemical structure of bipolar planetary nebulae. II. 13 objects
Perinotto M., Corradi R.
<Astron. Astrophys. 332, 721 (1998)>
=1998A&A...332..721P 1998A&A...332..721P (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Abundances
Keywords: ISM: abundances - planetary nebulae: general
Abstract:
Long slit spectrophotometry of 13 bipolar planetary nebulae has been
used to study their physical and chemical properties. In each nebula,
one to seven different spatial regions have been considered in order
to search for possible abundance variations through the nebulae. We
obtained the following main results:
- within the errors, the He, O, and N abundances are constant through
all the nebulae.
- the Ne, Ar, and S abundances are also constant, within the errors,
but their face values have systematic increases toward the outer
regions of the nebulae. These trends may be attributed to inaccuracies
in the ionization correction factors, as predicted by Alexander &
Balick (1997AJ....114..713A 1997AJ....114..713A) for long-slit observations of extended
PNe. The corresponding increase of the N abundance predicted by those
authors is, however, generally not observed (with one exception).
- The present sample contains some of the Galactic PNe with the
highest He and N/O abundances known to date (M 3-2, He 2-111, NGC
6537). The highest He overabundances cannot by reproduced by any
current model of AGB evolution.
- Oxygen depletion is suggested for the nebulae with the highest N/O
abundances, indicating that efficient ON cycle process has occurred in
their progenitors.
Objects:
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RA (2000) DE Designation(s)
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14 33 18 -60 49.6 Hen 2-111 = PN G315.0-00.3
15 04 09 -60 53.3 Hen 2-114 = PN G318.3-02.0
09 43 25.5 -57 16 53 Hen 2-36 = PN G279.6-03.1
12 28 47 -63 44.6 Hen 2-84 = PN G300.4-00.9
07 21 14.4 -18 08 34 M 1-13 = PN G232.4-01.8
07 37 18.9 -09 38 48 M 1-16 = PN G226.7+05.6
07 14 49 -27 50.4 M 3-2 = PN G240.3-07.6
15 34 16.6 -59 08 59 Mz 1 = PN G322.4-02.6
07 41 55.4 -18 12 31 NGC 2440 = HD 62166 = PN G234.8+02.4
09 16 01.5 -36 37 37 NGC 2818 = PN G261.9+08.5
09 27 03.0 -56 06 22 NGC 2899 = PN G277.1-03.8
16 12 58.2 -36 13 48 NGC 6072 = PN G342.1+10.8
18 05 13.0 -19 50 34 NGC 6537 = HD 312582 = PN G010.1+00.7
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
fluxes.dat 81 677 Observed line fluxes
abund.dat 129 533 Abundances
den.dat 39 13 Electronic densities
tnii.dat 54 13 [NII] temperatures
toiii.dat 54 13 [OIII] temperatures
table1.tex 116 1161 LaTeX version of fluxes.dat
table2.tex 105 433 LaTeX version of abund.dat, tnii.dat, toii.dat
and den.dat
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Byte-by-byte Description of file: fluxes.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN Planetary nebula name
11- 30 A20 --- Line Line identification
32- 37 F6.1 --- n3 ? Third region on the western lobe relative
abundance (1)
39- 44 F6.1 --- n2 ? Second region on the western lobe relative
abundance (1)
46- 51 F6.1 --- n1 ? First region on the western lobe relative
abundance (1)
53- 58 F6.1 --- cen ? Central region relative abundance (1)
61- 66 F6.1 --- p1 ? First region on the eastern lobe relative
abundance (1)
68- 73 F6.1 --- p2 ? Second region on the eastern lobe relative
abundance (1)
76- 81 F6.1 --- P3 ? Third region on the eastern lobe relative
abundance (1)
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Note (1): Abundance relative to Hβ=100.
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Byte-by-byte Description of file: abund.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN PN name
10- 23 A14 --- Ion Ion/Element
25- 29 A5 --- Line Line identification
33- 41 F9.3 --- n3 ? Abundance in the third region on the western lobe
43- 44 I2 --- e_n3 ? rms uncertainty on n3
47- 55 F9.3 --- n2 ? Abundance in the second region on the western lobe
57- 58 I2 --- e_n2 ? rms uncertainty on n2
59 A1 --- u_n2 Uncertainty flag on n2
61- 69 F9.3 --- n1 ? Abundance in the first region on the western lobe
71- 72 I2 --- e_n1 ? rms uncertainty on n1
73 A1 --- u_n1 Uncertainty flag on n1
75- 83 F9.3 --- cen ? Abundance in the central region
85- 86 I2 --- e_cen ? rms uncertainty on cen
87 A1 --- u_cen Uncertainty flag on cen
88- 96 F9.3 --- p1 ? Abundance in the first region on the eastern lobe
98- 99 I2 --- e_p1 ? rms uncertainty on p1
100 A1 --- u_p1 Uncertainty flag on p1
101-109 F9.3 --- p2 ? Abundance in the second region on the eastern lobe
111-112 I2 --- e_p2 ? rms uncertainty on p2
113 A1 --- u_p2 Uncertainty flag on p2
115-123 F9.3 --- p3 ? Abundance in the third region on the eastern lobe
125-126 I2 --- e_p3 ? rms uncertainty on p3
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Byte-by-byte Description of file: den.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN Planetary nebula name
10- 12 I3 cm-3 Nen3 ? Third western region lobe electronic density
14- 16 I3 cm-3 Nen2 ? Second western region lobe electronic density
18- 21 I4 cm-3 Nen1 ? First western region lobe electronic density
23- 26 I4 cm-3 Necen ? Central region electronic density
28- 31 I4 cm-3 Nep1 ? First eastern region lob
33- 35 I3 cm-3 Nep2 ? Second eastern region lobe electronic density
37- 39 I3 cm-3 Nep3 ? Third eastern region lobe electronic density
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Byte-by-byte Description of file: tnii.dat toiii.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- PN Planetary nebula name
10- 14 I5 K Tn3 ? Temperature for the third western region lobe
15 A1 --- n_Tn3 [a] a when adopted temperature
17- 21 I5 K Tn2 ? Temperature for the second western region lobe
22 A1 --- n_Tn2 [a] a when adopted temperature
24- 28 I5 K Tn1 ? Temperature for the first western region lobe
29 A1 --- n_Tn1 [a] a when adopted temperature
31- 35 I5 K Tcen ? Temperature for the central region
37- 41 I5 K Tp1 ? Temperature for the first eastern region lobe
43- 47 I5 K Tp2 ? Temperature for the second eastern region lobe
48 A1 --- n_Tp2 [a] a when adopted temperature
50- 54 I5 K Tp3 ? Temperature for the third eastern region lobe
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Acknowledgements: Romano Corradi
References:
Corradi et al., Paper I. (IC 4406) 1997A&A...322..975C 1997A&A...322..975C
(End) Patricia Bauer [CDS] 22-Jan-1998