The double-lined spectrum of LBV 1806-20

被引:31
作者
Figer, DF
Najarro, F
Kudritzki, RP
机构
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] CSIC, Inst Estructura Mat, Madrid 29006, Spain
[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
关键词
binaries : spectroscopic; infrared : stars; stars : early-type; stars : evolution; stars : fundamental parameters; stars : individual (LBV 1806-20);
D O I
10.1086/423306
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Despite much theoretical and observational progress, there is no known firm upper limit to the masses of stars. Our understanding of the interplay between the immense radiation pressure produced by massive stars in formation and the opacity of infalling material is subject to theoretical uncertainties, and many observational claims of "the most massive star" have failed the singularity test. LBV 1806-20 is a particularly luminous object, L similar to 10(6) L., for which some have claimed very high mass estimates (M-initial > 200 M.), based in part on its similarity to the Pistol star. We present high-resolution near-infrared spectroscopy of LBV 1806-20, showing that it is possibly a binary system with components separated in velocity by similar to70 km s(-1). If correct, then this system is not the most massive star known, yet it is a massive binary system. We argue that a binary, or merged, system is more consistent with the ages of nearby stars in the LBV 1806-20 cluster. In addition, we find that the velocity of V-LSR = 36 km s(-1) is consistent with a distance of 11.8 kpc, a luminosity of 10(6.3) L., and a system mass of similar to130 M..
引用
收藏
页码:L109 / L112
页数:4
相关论文
共 30 条
[1]   A COMPARISON OF NEAR-INFRARED SPECTRA OF THE GALACTIC-CENTER COMPACT HE-I EMISSION-LINE SOURCES AND EARLY-TYPE MASS-LOSING STARS [J].
BLUM, RD ;
DEPOY, DL ;
SELLGREN, K .
ASTROPHYSICAL JOURNAL, 1995, 441 (02) :603-616
[2]  
BONANOS AZ, 2004, UNPUB APJ
[3]  
BOND JR, 1984, ASTROPHYS J, V280, P825, DOI 10.1086/162057
[4]  
BRAND J, 1993, ASTRON ASTROPHYS, V275, P67
[5]   η Carinae:: Binarity confirmed [J].
Damineli, A ;
Kaufer, A ;
Wolf, B ;
Stahl, O ;
Lopes, DF ;
de Araújo, FX .
ASTROPHYSICAL JOURNAL, 2000, 528 (02) :L101-L104
[6]   Eta Carinae: A long period binary? [J].
Damineli, A ;
Conti, PS ;
Lopes, DF .
NEW ASTRONOMY, 1997, 2 (02) :107-117
[7]   Local stellar kinematics from Hipparcos data [J].
Dehnen, W ;
Binney, JJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 298 (02) :387-394
[8]  
EIKENBERRY SS, 2004, IN PRESS APJ
[9]   Possible infrared counterparts to the soft gamma-ray repeater SGR 1806-20 [J].
Elkenberry, SS ;
Garske, MA ;
Hu, D ;
Jackson, MA ;
Patel, SG ;
Barry, DJ ;
Colonno, MR ;
Houck, JR .
ASTROPHYSICAL JOURNAL, 2001, 563 (02) :L133-L137
[10]  
FEITZINGER JV, 1980, ASTRON ASTROPHYS, V84, P50