ACCURATE OSCILLATOR-STRENGTHS FOR ULTRAVIOLET LINES OF AR .1. IMPLICATIONS FOR INTERSTELLAR MATERIAL

被引：31

作者：

FEDERMAN, SR ^{[1
]}

BEIDECK, DJ ^{[1
]}

SCHECTMAN, RM ^{[1
]}

YORK, DG ^{[1
]}

机构：

[1] UNIV CHICAGO,CTR ASTRON & ASTROPHYS,CHICAGO,IL 60637

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 401卷 / 01期

关键词：

ATOMIC DATA; ATOMIC PROCESSES; ISM; ABUNDANCES; ULTRAVIOLET; INTERSTELLAR;

D O I：

10.1086/172067

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Analysis of absorption from interstellar Ar I in lightly reddened lines of sight provides information on the warm and hot components of the interstellar medium near the Sun. The details of the analysis are limited by the quality of the atomic data. Accurate oscillator strengths for the Ar I lines at 1048 and 1067 angstrom and the astrophysical implications are presented. From lifetimes measured with beam-foil spectroscopy, anf-value for lambda1048 of 0.257 +/- 0.013 (1 sigma) is obtained. Through the use of a semiempirical formalism for treating singlet-triplet mixing, an oscillator strength of 0.064 +/- 0.003 (1 sigma) is derived for lambda1067. Because of the accuracy of the results, the conclusions of York and colleagues from spectra taken with the Copernicus satellite are strengthened. In particular, for interstellar gas in the solar neighborhood, argon has a solar abundance, and the warm, neutral material is not pervasive.

引用

页码：367 / 370

页数：4

共 39 条

[1] BEAM-FOIL SPECTROSCOPY AT LOW INITIAL ION ENERGIES - RADIATIVE LIFETIMES MEASUREMENTS FOR NA, NE, AR, KR AND XE [J].