Planetary nebulae results from the infrared space observatory

被引：0

作者：

Rubin, RH ^{[1
]}

Dufour, RJ ^{[1
]}

Colgan, SWJ ^{[1
]}

Liao, A ^{[1
]}

Harrington, JP ^{[1
]}

Levine, DA ^{[1
]}

Lord, SD ^{[1
]}

机构：

[1] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

来源：

IONIZED GASEOUS NEBULAE: A CONFERENCE TO CELEBRATE THE 60TH BIRTHDAY OF SILVIA TORRES-PEIMBERT AND MANUEL PEIMBERT | 2002年 / 12卷

关键词：

ISM : structure; planetary nebulae : general;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations with the Infrared Space Observatory (ISO) provide a means to assess important properties of the plasma in gaseous nebulae, including planetary nebulae (PNs). We present some results for average electron densities that have been determined from the flux ratios of several fine-structure, infrared emission lines. Because the ISO spectroscopic aperture was always at least as large as 14" x 20", these represent macroscopic measurements for our sample of PNs. We find some instances of the observed line flux ratio being clearly out of range of the theoretical predictions using current atomic data. In these cases, the ISO data cannot presently be used with these atomic data to derive electron density, but rather provide direction for needed improvements in the atomic collision strengths.

引用

页码：106 / 111

页数：6

共 18 条

[1] Infrared spectroscopy of NGC 4151: Probing the obscured ionizing active galactic nucleus continuum [J].