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 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 90 201 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-per-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 1978IAUS...76..215P;
Type I; He- and N-rich
Type II: intermediate population
Type III: high-velocity
Type IV: halo (not studied here)
--------------------------------------------------------------------------------
Byte-per-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