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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 (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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 57 130 Data for disk planetary nebulae table1.tex 80 244 TeX version of table1
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
Bytes Format Units Label Explanations
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)
Note (1): 1 - Maciel and Koeppen (1994, Cat. J/A+A/282/436) 2 - Costa et al. (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) 5 - Hajian et al. (1997ApJ...487..304H) 6 - Kingsburgh and Barlow (1994MNRAS.271..257K) 7 - Perinotto et al. (1994A&AS..107..481P) 8 - Perinotto (1991ApJS...76..687P) 9 - Koeppen et al. (1991A&A...248..197K)
Acknowledgements: Walter J. Maciel
(End) Patricia Bauer [CDS] 04-Mar-1999
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