Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-27
Astrophys.J. 617 (2004) 1330-1346
Astronomy and Astrophysics
Astrophysics
26 pages, 6 tables, 10 figures. ApJ accepted
Scientific paper
10.1086/425410
We present first results from the Palomar Adaptive Optics Survey of Young Stars conducted at the Hale 5 m telescope. Through direct imaging we have discovered a brown dwarf and two low-mass stellar companions to the young solar-type stars HD 49197, HD 129333 (EK Dra), and V522 Per, and confirmed a previously suspected companion to RX J0329.1+0118 (Sterzik et al. 1997), at respective separations of 0.95" (43 AU), 0.74" (25 AU), 2.09" (400 AU), and 3.78" (380 AU). Physical association of each binary system is established through common proper motion and/or low-resolution infrared spectroscopy. Based on the companion spectral types, we estimate their masses at 0.06, 0.20, 0.13, and 0.20 Msun, respectively. From analysis of our imaging data combined with archival radial velocity data, we find that the spatially resolved companion to HD 129333 is potentially identical to the previously identified spectroscopic companion to this star (Duquennoy & Mayor 1991). However, a discrepancy with the absolute magnitude suggests that the two companions could also be distinct, with the resolved one being the outermost component of a triple system. The brown dwarf HD 49197B is a new member of a growing list of directly imaged sub-stellar companions at 10-1000 AU separations from main sequence stars, indicating that such brown dwarfs may be more common than initially speculated.
Hillenbrand Lynne A.
Metchev Stanimir A.
No associations
LandOfFree
Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Initial Results from the Palomar Adaptive Optics Survey of Young Solar-Type Stars: a Brown Dwarf and Three Stellar Companions will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-210700