VizieR Online Data Catalog: Hawaii infrared parallax program. II. Ultracool dwarfs (Liu+, 2016)
Abstract
Since 2007, we have been carrying out a high-precision parallax program at the 3.6m CFHT using the facility wide-field IR camera WIRCam. We began observing the majority of the 67 ultracool objects of the sample presented here in mid-2009, except for SDSS J2249+0044AB, which was started in mid-2008, and several objects that we added to our program during 2010-2013. Images were obtained in J band for most of our targets, while brighter targets at risk of saturating in the WIRCam minimum integration time (5s) were observed in a narrow K-band filter (KH2) centered at 2.122um.
We obtained high-S/N NIR spectra for five of our targets in order to assign spectral types and assess surface gravity. We used the NASA Infrared Telescope Facility on the summit of Mauna Kea, Hawaii, with the spectrograph SpeX (R~150). We obtained resolved imaging of DENIS J1441.6-0945AB on 2014 March 14 UT using the facility camera NIRC2 in concert with the laser guide star adaptive optics (LGS AO) system on the Keck II telescope. We used the standard Mauna Kea Observatories (MKO) filters J, H, and K in addition to the NIRC2 Y-band filter. (5 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- June 2018
- DOI:
- 10.26093/cds/vizier.18330096
- Bibcode:
- 2018yCat..18330096L
- Keywords:
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- Spectral types;
- Parallaxes: trigonometric;
- Proper motions;
- Photometry: infrared;
- Magnitudes: absolute;
- Stars: brown dwarf