/ftp/cats/aliases/K/./KVA2007



==========================================================================
J/ApJ/660/1428      Astrometry around RX J0720.4-3125        (Kaplan+, 2007)
The following files can be converted to FITS (extension .fit or fit.gz)
	table4.dat table7.dat table9.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJ/660/1428
==========================================================================

drwxr-xr-x 18 cats archive 315 Jan 29 2012 [Up] drwxr-xr-x 2 cats archive 282 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 487 Dec 19 2022 .message -r--r--r-- 1 cats archive 8243 Apr 19 2009 ReadMe -rw-r--r-- 1 cats archive 300 Apr 19 2009 +footg5.gif -rw-r--r-- 1 cats archive 2163 Apr 19 2009 +footg8.gif -r--r--r-- 1 cats archive 1633 Mar 13 2009 table4.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 153532 Mar 13 2009 table7.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 8892 Mar 13 2009 table9.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/ApJ/660/1428 Astrometry around RX J0720.4-3125 (Kaplan+, 2007) ================================================================================ The distance to the isolated neutron star RX J0720.4-3125. Kaplan D.L., Van Kerkwijk M.H., Anderson J. <Astrophys. J., 660, 1428-1443 (2007)> =2007ApJ...660.1428K ================================================================================ ADC_Keywords: X-ray sources ; Positional data Keywords: astrometry - stars: individual (RX J0720.4-3125) - stars: neutron - X-rays: individual (RX J0720.4-3125) Abstract: We have used a set of dedicated astrometric data from the Hubble Space Telescope to measure the parallax and proper motion of the nearby neutron star RX J0720.4-3125. At each of eight epochs over 2 years, we used the High Resolution Camera of the Advanced Camera for Surveys to measure the position of the B=26.6 target to a precision of  2mas ( 0.07pix) relative to 22 other stars. From these data we measure a parallax of plx=2.8+/-0.9mas (for a distance of 360^+170^_-90_pc) and a proper motion of mu=107.8+/-1.2mas/yr. Exhaustive testing of every stage of our analysis suggests that it is robust, with a maximum systematic uncertainty on the parallax of 0.4mas. The distance is compatible with earlier estimates made from scaling the optical emission of RX J0720.4-3125 relative to the even closer neutron star RX J1856.5-3754. The distance and proper motion imply a transverse velocity of 180^+90^_-40_km/s, comparable to velocities observed for radio pulsars. The speed and direction suggest an origin for RX J0720.4-3125 in the Trumpler 10 OB association  0.7Myr ago, with a possible range of 0.5-1.0Myr given by the uncertainty in the distance. Description: Our main data set consists of 64 exposures taken during eight visits of the field of RX J0720.4-3125 with HST, between 04 Jul 2002 and 19 Mar 2004. All data were taken with the High Resolution Camera (HRC; with a plate scale of 28.27mas/pix) and the F475W (SDSS g') filter, which has good sensitivity to the blue colors of RX J0720.4-3125. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 07 20 24.961 -31 25 50.21 X = RX J0720.4-3125 -------------------------------------------------