Abundances of recently discovered planetary nebulae towards the galactic bulge

被引：34

作者：

Escudero, AV ^{[1
]}

Costa, RDD ^{[1
]}

机构：

[1] USP, IAG, Dept Astron, BR-01060970 Sao Paulo, Brazil

来源：

ASTRONOMY & ASTROPHYSICS | 2001年 / 380卷 / 01期

关键词：

ISM : planetary nebulae; galactic bulge; techniques : spectroscopic;

D O I：

10.1051/0004-6361:20011490

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work we report spectrophotometric observations of a planetary nebula sample towards the galactic bulge. A total of 45 PNe was observed and their physical parameters (electron density and temperature) were derived. Ionic abundances were calculated using a three-level atom model and abundances were derived through ionisation correction factors. Results show low abundance objects at high galactic latitudes, indicating a possible vertical gradient inside the bulge. A few objects with low N/O ratio were found, which could have originated from old, low mass progenitors.

引用

页码：300 / 308

页数：9

共 28 条

[1]

Acker A., 1992, The Strasbourg-ESO Catalogue of Galactic Planetary Nebulae. Parts I

[2] A SPECTROSCOPIC SURVEY OF 51-PLANETARY NEBULAE [J].