NGC-1569 - IDENTIFICATION FROM CA-II INFRARED LINE SPECTRA OF THE OBJECTS-A,B AS SUPERLUMINOUS STAR-CLUSTERS

被引：0

作者：

PRADA, F

GREVE, A

MCKEITH, CD

机构：

[1] IRAM, 300 RUE PISCINE, DOMAINE UNIV, F-38406 ST MARTIN DHERES, FRANCE

[2] QUEENS UNIV BELFAST, DEPT PURE & APPL PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND

来源：

ASTRONOMY & ASTROPHYSICS | 1994年 / 288卷 / 02期

关键词：

GALAXIES; INDIVIDUAL; NGC-1569; ISM; STELLAR CONTENT; STAR CLUSTERS;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present blue and near-infrared spectroscopic data which provide evidence that the stellar-like objects (called A and B) in the nucleus of NGC 1569 are star clusters. The Ca II infrared triplet absorption lines and the slope of the spectral continuum reveal that the star cluster B is in the red supergiant phase of the cluster evolution at an age of 12 Myr, while the star cluster A is in the blue star phase at an age of 13-20 Myr. Evidence for a stellar condensation is also found within the large H II region close to A as indicated by the Ca II triplet present in its near-infrared spectrum. We give reddening-corrected emission line ratios for this H II region.

引用

页码：396 / 400

页数：5

共 37 条

[1]

ABLES HD, 1971, PUBL US NAVAL OBS 4, V20, P60

[2] SPECTRA OF THE 2 BRIGHTEST OBJECTS IN THE AMORPHOUS GALAXY NGC 1569 - SUPERLUMINOUS YOUNG STAR-CLUSTERS OR STARS IN A NEARBY PECULIAR GALAXY [J].