VizieR Online Data Catalog: Kinematic of stars in Galactic center (Yelda+, 2014)
Abstract
There are 116 stars that form the sample of this study. The astrometric measurements are based on three types of high-angular resolution 2μm imaging observations (speckle imaging, narrow-field adaptive optics imaging, wide-field mosaic AO imaging), which have been obtained at the W. M. Keck observatory over a 16yr time period.
The earliest data sets were obtained with K-band (2.2μm) speckle imaging between 1995 and 2005 (1995 Jun 9-12, 1996 Jun 26-27, 1997 May 14, 1998 Apr 2-3, 1998 May 14-15, 1998 Jul 3-5, 1998 Aug 4-6, 1998 Oct 9, 1999 May 2-4, 1999 Jul 24-25, 2000 May 19-20, 2000 Jul 19-20, 2000 Oct 18, 2001 May 7-9, 2001 Jul 28-29, 2002 Apr 23-24, 2002 May 23-24, 2002 Jul 19-20, 2003 Apr 21-22, 2003 Jul 22-23, 2003 Sep 7-8, 2004 Apr 29-30, 2004 Jul 25-26, 2004 Aug 29, 2005 Apr 24-25, 2005 Jul 26-27) using the Near Infrared Camera (NIRC), which has a ~5''*5'' FOV. Since 2004, we have utilized the Keck II Adaptive Optics (AO) system in conjunction with the facility near infrared camera NIRC2 (PI: K. Matthews) in its narrow-field mode, which has a plate scale of 9.952mas/pix and a 10'' FOV (~0.4pc at the 8kpc distance to the Galactic center). Here we include all existing Keck AO observations through 2011, which includes 19 epochs (2004 Jul 26, 2005 Jun 30, 2005 Jul 31, 2006 May 2-3, 2006 Jun 19-20, 2006 Jul 16, 2007 May 17, 2007 Aug 11-12, 2008 May 15, 2008 Jul 24, 2009 May 4, 2009 Jul 24, 2009 Sep 9, 2010 May 5, 2010 Jul 6, 2010 Aug 15, 2011 May 27, 2011 Jul 18, 2011 Aug 23) and a time baseline of seven years. To measure the proper motions of the young stars at larger radii from Sgr A* (R>~7''), we obtained three epochs of K'-band Laser Guide Star Adaptive Optics (LGSAO) mosaics with the NIRC2 narrow camera that cover 27''*27'' (~1.1pc*1.1pc). These observations were taken on 2006 May 3, 2008 May 20, and 2010 June 5. To spectroscopically identify young stars and measure their line-of-sight motions, high angular resolution spectroscopic observations were obtained with the integral field spectrograph OSIRIS in conjunction with the LGSAO system on Keck II. The central 4'' have been observed since 2006 with the Kn3 narrowband filter centered on the Brγ line (λ=2.1661μm) and using the 35mas plate scale. In 2010, we began the Galactic Center OSIRIS Wide-field Survey (GCOWS), in which observations were taken along the eastern portion of the CW disk in order to maximize the number of young star identifications (Do et al. 2013, cat. J/ApJ/764/154). These observations reached a radial extent of R~14'' east of Sgr A* and used the 50mas plate scale. The details of our OSIRIS observations are presented in Ghez et al. (2008ApJ...689.1044G) and Do et al. 2009 (cat. J/ApJ/703/1323), 2013 (cat. J/ApJ/764/154). We present the positions, proper motions, and accelerations for our sample in Table4. Updated astrometry for the secondary standards originally presented in Yelda et al. 2010 (cat. J/ApJ/725/331) is shown in Table8. (3 data files).- Publication:
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VizieR Online Data Catalog
- Pub Date:
- April 2016
- DOI:
- 10.26093/cds/vizier.17830131
- Bibcode:
- 2016yCat..17830131Y
- Keywords:
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- Milky Way;
- Associations: stellar;
- Radial velocities;
- Proper motions;
- Positional data;
- Stars: standard