[vsnet-alert 7017] [FWD] Peculiar variable in Monoceros: radio observations

[Hitoshi YAMAOKA <yamaoka@rc.kyushu-u.ac.jp>]

>Date: Sat, 12 Jan 2002 09:53:34 -0700 (MST)
From: mrupen@aoc.nrao.edu
Subject: Peculiar variable in Monoceros: radio observations

Peculiar variable in Monoceros: radio observations

Dear colleagues,

  we observed the peculiar variable in Monoceros with the Very Large Array
on 11 and 12 January 2002.  Although we do see a 0.5 mJy source at 8.5 GHz,
it lies about 5 arcsec east and 8 arcsec north of the reported optical
position.  The radio position is derived from that of the VLBI source 
J0725-0054, and the systematic uncertainty should be of order 0.1-0.2 arcsec.
The random error is +/- 1-2 arcsec in each coordinate.

  VLA observing log:
    RA 07 04 05.14  DEC -03 50 43.1 (J2000)

    11 Jan. 2002  4860.1 MHz   nada  +/- 0.12  mJy
    11 Jan. 2002  8460.1 MHz   0.490 +/- 0.055 mJy

    12 Jan. 2002  8460.1 MHz   0.574 +/- 0.045 mJy
    12 Jan. 2002 14939.9 MHz   nada  +/- 0.30  mJy

It would be very unusual to find an unrelated 8.5 GHz source so near to an a 
priori position; not impossible, but surprising.  Further radio observations are
scheduled, and should provide both a better position, and more stringent
limits on variability.

              -- Michael Rupen, Amy Mioduszewski, & Vivek Dhawan
                 NRAO/Socorro

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