Local (thick-disc) white dwarfs and the Galactic mass budget

被引：22

作者：

Fuhrmann, K. ^{[1
,2
]}

Chini, R. ^{[1
,3
]}

Hoffmeister, V. H. ^{[1
]}

Bernkopf, J. ^{[4
]}

机构：

[1] Ruhr Univ Bochum, Astron Inst, D-44780 Bochum, Germany

[2] Isaac Newton Grp Telescopes, E-38700 Santa Cruz De La Palma, Spain

[3] Univ Catolica Norte, Inst Astron, Antofagasta 1280, Chile

[4] Univ Appl Sci Augsburg, D-86161 Augsburg, Germany

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2012年 / 420卷 / 02期

关键词：

stars: Population II; white dwarfs; solar neighbourhood; Galaxy: stellar content; BINARY-SYSTEMS; 3D KINEMATICS; NEARBY STARS; SPY PROJECT; HALO; PARALLAXES;

D O I：

10.1111/j.1365-2966.2011.20127.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The stars of the solar neighbourhood essentially originate from two stellar populations: Population I (the thin disc) and Population II (the thick disc). Recently, we completed an unbiased sample of long-lived solar-type stars and demonstrated that the local normalization of the thick disc versus thin disc is about 20 per cent. In this second paper, we present the observational evidence that at least this percentage is also met in the realm of their degenerate counterparts and may even be as high as one-third. Along with the results from the solar-type stars, this is a direct confirmation of the thick disc being the massive and dark baryonic population of the Milky Way.

引用

页码：1423 / 1428

页数：6

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