The CaII infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars

被引：32

作者：

Castelli, F

Hubrig, S

机构：

[1] Osserv Astron Trieste, Trieste, Italy

[2] European So Observ, Santiago 19, Chile

[3] CNR, Inst Astrofis Spaziale & Fis Cosm, I-00133 Rome, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 421卷 / 01期

关键词：

stars : abundances; stars : atmospheres; stars : chemically peculiar; stars : atomic data; stars;

D O I：

10.1051/0004-6361:20040164

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

For the first time we present observational evidence for an anomalous isotopic structure of Call in mercury-manganese (HgMn) stars. The centroid wavelengths of Ca II infrared triplet lines in a number of stars have been found redshifted with respect to the centroids of the terrestrial Call lines. The record holder is the star HD 175640 for which the measured wavelength is consistent with Call being present in the atmosphere entirely in form of the heaviest stable isotope Ca-48. This is a very striking result as Ca-48 makes up only 0.187% of the terrestrial Ca mixture.

引用

页码：L1 / L4

页数：4

共 18 条

[1] ABUNDANCES OF THE ELEMENTS - METEORITIC AND SOLAR [J].