HIGH-VELOCITY INTERSTELLAR GAS TOWARD HD-169454

被引：11

作者：

FEDERMAN, SR ^{[1
]}

LAMBERT, DL ^{[1
]}

机构：

[1] UNIV TOLEDO,DEPT PHYS & ASTRON,TOLEDO,OH 43606

来源：

ASTRONOMICAL JOURNAL | 1992年 / 104卷 / 02期

关键词：

D O I：

10.1086/116264

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The interstellar spectrum of HD 169454 reveals Na D and Ca K absorption at upsilon(LSR) approximately + 100 km s-1. Measurements made at high resolution resolve 4 narrow (b approximately 2-3 km s-1 ) features whose N(Ca II)/N(Na I) ratios are small. This high-velocity gas is, therefore, unique in that it resembles local quiescent gas, not shocked gas. Redshifted gas is also seen in moderate-resolution spectra of faint stars lying in the same portion of the sky as HD 169454. The resulting picture is one in which a supernova explosion or stellar winds within the Sct OB3 association at a distance of about 1.5 kpc is pushing quiescent gas away from the Sun. The gas is seen only in stars estimated to be at most 3 kpc, but greater than 2 kpc, away. If HD 169454 is at this greater distance, its absolute magnitude would be about -9, making it the second most luminous B star in the Galaxy.

引用

页码：691 / 695

页数：5