Variability of circumstellar emission from dust envelopes around carbon stars

被引：1

作者：

Blanco, A ^{[1
]}

Borghesi, A ^{[1
]}

Epifani, E ^{[1
]}

Fonti, S ^{[1
]}

Orofino, V ^{[1
]}

Strafella, F ^{[1
]}

机构：

[1] Univ Lecce, Dept Phys, I-73100 Lecce, Italy

来源：

ASTROPHYSICS AND SPACE SCIENCE | 1998年 / 262卷 / 01期

关键词：

D O I：

10.1023/A:1001896524026

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The main constituents of the dust, produced around late-type carbon stars, are thought to be carbon and silicon carbide (SiC), although their exact nature is not yet well established. This subject has been addressed by several authors and good fits of a large number of IRAS sources (chosen among the carbon stars exhibiting the SiC feature at about 11.3 mu m) were obtained. In this work we use the same procedure on a limited number of objects, of the same type, taking into account the variability of such sources and the changes induced in their IR spectra. For this purpose, the chosen stars have been observed with a spectral resolution higher than that available for the IRAS data (lambda/Delta lambda congruent to 50), using the CGS3 instrument of the UKIRT telescope, both in the low (lambda /Delta lambda congruent to 160) and in the high (lambda /Delta lambda congruent to 500) resolution configuration. The results are discussed and some preliminary conclusions are drawn.

引用

页码：107 / 113

页数：7

共 19 条

[1] INTERSTELLAR SIC WITH UNUSUAL ISOTOPIC COMPOSITIONS - GRAINS FROM A SUPERNOVA [J].