Astrometry and photometry for cool dwarfs and brown dwarfs

被引：0

作者：

Dahn, CC ^{[1
]}

Guetter, HH ^{[1
]}

Harris, HC ^{[1
]}

Henden, AA ^{[1
]}

Luginbuhl, CB ^{[1
]}

Monet, AKB ^{[1
]}

Monet, DG ^{[1
]}

Pier, JR ^{[1
]}

Stone, RC ^{[1
]}

Vrba, FJ ^{[1
]}

Walker, RL ^{[1
]}

机构：

[1] US Naval Observ, Flagstaff, AZ 86002 USA

来源：

FROM GIANT PLANETS TO COOL STARS, PROCEEDINGS | 2000年 / 212卷

关键词：

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Preliminary trigonometric parallaxes are presented for 12 cool dwarfs and brown dwarfs with spectral types ranging from M9.5V to L8V. Optical (V,R-c,I-c,z*) and near-IR (J,H,K) photometry determined at USNOFS are also presented for the same objects as well as for an additional 4 L-dwarfs for which astrometry is not yet available. Sample relationships between spectral type, colors, and absolute magnitude are displayed. The I-J color is found to become progressively redder throughout the L-dwarf regime and as far as Gliese 229B, the well-studied methane (T type) dwarf. The latest L-dwarf in this sample (2MW1632+19, at L8V) is found to be only similar to 0.8 mag more luminous than Gl229B in M-J.

引用

页码：74 / 81

页数：8

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