Access to Astronomical Catalogues

← Click to display the menu
J/A+A/282/436     Abundance gradients from disk PNs     (Maciel+ 1994)

Abundance gradients from disk planetary nebulae: O, Ne, S, and Ar Maciel W.J., Koeppen J. <Astron. Astrophys. 282, 436 (1994)> =1994A&A...282..436M
ADC_Keywords: Planetary nebulae ; Abundances Keywords: planetary nebulae: general - stars: abundances - Galaxy: abundances - Galaxy: evolution Abstract: A new determination of the radial abundance gradients of O/H, Ne/H, S/H, and Ar/H is made for disk planetary nebulae, (PN), that is, those objects of Peimbert types I, II, and III. On the basis of a sample containing 200 nebulae, it can be concluded that these gradients are generally similar, and of the same order of magnitude as the O/H gradient displayed by galactic HII regions. Some distance-independent correlations confirm the accuracy of the abundances and support the interpretation of the gradients in terms of chemical evolution models. The time evolution of the abundance gradients in the Milky Way is investigated, and their variation with the types of PN are compared with predictions of chemical evolution models. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 58 201 Basic data for planetary nebulae table2.dat 91 201 Abundance of disk planetary nebulae refs.dat 79 45 References
See also: 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- 10 A10 --- Name Name of the planetary nebula 12- 20 A9 --- PK Perek-Kohoutek designation 23- 25 A3 --- Type *Peimbert type 29- 32 F4.1 kpc d Heliocentric distance 37- 47 A11 --- r_d references to distance (see file refs.dat) 52- 56 F5.2 kpc R Projected distance to the Galactic Center
Note on Type: classification introduced by Peimbert, 1978IAUS...76..215P; Type I; He- and N-rich Type II: intermediate population Type III: high-velocity Type IV: halo (not studied here)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
2- 11 A10 --- Name Name of the planetary nebula 12- 15 F4.2 --- O/H ? Oxygen abundances with respect to H 17- 30 A14 --- r_O/H ? references to O/H (see refs.dat) 32- 35 F4.2 --- Ne/H ? Neon abundances with respect to H 37- 50 A14 --- r_Ne/H ? references to Ne/H (see refs.dat) 52- 55 F4.2 --- S/H ? Sulfur abundances with respect to H 57- 70 A14 --- r_S/H ? references to S/H (see refs.dat) 72- 75 F4.2 --- Ar/H ? Argon abundances with respect to H 77- 91 A15 --- r_Ar/H ? references to Ar/H (see refs.dat)
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Ref Reference code used in the tables 10- 28 A19 --- Bibcode The 19-digit bibcode 30- 79 A50 --- Text Authors
History: * 30-Jul-2001: File refs.dat with bibcodes added.
(End) Patricia Bauer [CDS] 29-Oct-1993
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service