| Full text | |
| Author(s): |
Costa‚ R. D. D.
;
Uchida‚ M. M. M.
;
Maciel‚ W. J.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 423, n. 1, p. 199-207, 2004. |
| Field of knowledge: | Physical Sciences and Mathematics - Astronomy |
| Abstract | |
In this paper we report new observations and derive chemical abundances for a sample of 26 planetary nebulae (PN) located in the anticenter direction. Most of these nebulae are far away objects, located at Galactocentric distances greater than about 8 kpc, so that they are particularly useful for the determination of the radial gradients at large distances from the galactic center. A comparison of the present results with previously determined abundances suggests that the radial abundance gradients flatten out at distances larger than about 10 kpc from the center. (AU) | |