On the evidence for brown dwarf secondary stars in cataclysmic variables

被引：35
作者：
Littlefair, SP
Dhillon, VS
Martín, EL
机构：
[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England
[2] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 340卷 / 01期
关键词：
binaries : spectroscopic; stars : individual : LL And; stars; low-mass; brown dwarfs; novae; cataclysmic variables; infrared : stars;
D O I：
10.1046/j.1365-8711.2003.06295.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the K-band spectrum of the cataclysmic variable LL And, obtained using NIRSPEC on Keck-II. The spectrum shows no evidence for the absorption features observed by Howell and Ciardi, which these authors used to claim a detection of a brown dwarf secondary star in LL And. In light of our new data, we review the evidence for brown dwarf secondary stars in this and other cataclysmic variables.
引用
收藏
页码：264 / 268
页数：5
相关论文
共 23 条
[1]  
Beuermann K, 2000, ASTRON ASTROPHYS, V354, pL49
[2]   Color transformations for the 2MASS Second Incremental Data Release [J].
Carpenter, JM .
ASTRONOMICAL JOURNAL, 2001, 121 (05) :2851-2871
[3]   The relative contributions to the near-infrared emission in short-period cataclysmic variables [J].
Ciardi, DR ;
Howell, SB ;
Hauschildt, PH ;
Allard, F .
ASTROPHYSICAL JOURNAL, 1998, 504 (01) :450-460
[4]   Infrared spectroscopy of cataclysmic variables - III. Dwarf novae below the period gap and nova-like variables [J].
Dhillon, VS ;
Littlefair, SP ;
Howell, SB ;
Ciardi, DR ;
Harrop-Allin, MK ;
Marsh, TR .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2000, 314 (04) :826-838
[5]   Infrared properties of cataclysmic variables in the 2 Micron All-Sky Survey Second Incremental Data Release [J].
Hoard, DW ;
Wachter, S ;
Clark, LL ;
Bowers, TP .
ASTROPHYSICAL JOURNAL, 2002, 565 (01) :511-538
[6]   On the existence of low-luminosity cataclysmic variables beyond the orbital period minimum [J].
Howell, SB ;
Rappaport, S ;
Politano, M .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 287 (04) :929-936
[7]   Hubble Space Telescope/STIS spectroscopy of the white dwarfs in the short-period dwarf novae LL Andromedae and EF Pegasi [J].
Howell, SB ;
Gänsicke, BT ;
Szkody, P ;
Sion, EM .
ASTROPHYSICAL JOURNAL, 2002, 575 (01) :419-426
[8]   Spectroscopic discovery of brown dwarf-like secondary stars in the cataclysmic variables LL Andromedae and EF Eridani [J].
Howell, SB ;
Ciardi, DR .
ASTROPHYSICAL JOURNAL, 2001, 550 (01) :L57-L59
[9]   Time-resolved spectroscopy of AL Comae [J].
Howell, SB ;
Hauschildt, P ;
Dhillon, VS .
ASTROPHYSICAL JOURNAL, 1998, 494 (02) :L223-L226
[10]  
KOLB U, 1993, ASTRON ASTROPHYS, V271, P149
123