J/A+A/345/629 Abundance gradients in planetary nebulae (Maciel+, 1999)
Abundance gradients in the outer galactic disk from planetary nebulae
Maciel W.J., Quireza C.
<Astron. Astrophys. 345, 629 (1999)>
=1999A&A...345..629M 1999A&A...345..629M (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Abundances, peculiar
Keywords: ISM: abundances - ISM: planetary nebulae: general -
Galaxy: abundances
Abstract:
Radial abundance gradients of the element ratios O/H, Ne/H, S/H, and
Ar/H are determined on the basis of a sample of disk planetary
nebulae. The behaviour of the gradients at large distances from the
galactic centre, R>R0=7.6kpc, is emphasized. It is concluded that
the derived gradients are consistent with an approximately constant
slope in the inner parts of the Galaxy, and some flattening for
distances larger than R0. A comparison is made with previous
determinations using both photoionized nebulae and young stars, and
some consequences on theoretical models for the chemical evolution of
the galactic disk are discussed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 130 Data for disk planetary nebulae
table1.tex 80 244 TeX version of table1
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See also:
V/84 : Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (Acker+ 1992)
J/A+A/282/436 : Abundance gradients from disk PNs (Maciel+ 1994)
J/A+A/313/924 : Relative fluxes in 11 type I PN (Costa+, 1996)
J/A+A/423/199 : Chemical abundances of planetary nebulae (Costa+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Common name of the nebula
11- 20 A10 --- PNG PNG catalogue number
22- 25 F4.1 kpc Dist Distance
27- 31 F5.2 kpc GDist Galactocentric distance
33- 36 F4.2 --- O/H O/H abundance in the form: log (O/H) + 12
38- 41 F4.2 --- Ne/H Ne/H abundance in the form: log (Ne/H) + 12
43- 46 F4.2 --- S/H S/H abundance in the form: log (S/H) + 12
48- 51 F4.2 --- Ar/H Ar/H abundance in the form: log (Ar/H) + 12
53- 57 A5 --- Ref Reference of the abundances (1)
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Note (1): 1 - Maciel and Koeppen (1994, Cat. J/A+A/282/436)
2 - Costa et al. (1996A&AS..116..249C 1996A&AS..116..249C)
3 - Costa et al. (1997, in: Advances in stellar evolution,
Rood, R.T., Renzini, A. (eds.), CUP, Cambridge, 159)
4 - Corradi et al. (1997A&A...322..975C 1997A&A...322..975C)
5 - Hajian et al. (1997ApJ...487..304H 1997ApJ...487..304H)
6 - Kingsburgh and Barlow (1994MNRAS.271..257K 1994MNRAS.271..257K)
7 - Perinotto et al. (1994A&AS..107..481P 1994A&AS..107..481P)
8 - Perinotto (1991ApJS...76..687P 1991ApJS...76..687P)
9 - Koeppen et al. (1991A&A...248..197K 1991A&A...248..197K)
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Acknowledgements: Walter J. Maciel
(End) Patricia Bauer [CDS] 04-Mar-1999