[vsnet-campaign 1164] (fwd) V445 Pup appears as a radio source

[Daisaku Nogami <nogami@kwasan.kyoto-u.ac.jp>]

 Date: Tue, 11 Sep 2001 15:31:05 -0600 (MDT)
 From: mrupen@aoc.nrao.edu
 Subject: V445 Pup appears as a radio source

Dear colleagues,

  we have detected radio emission from the peculiar variable V445 Puppis.
VLA observations show a new, ~10 mJy radio source coincident with the optical
source (cf. IAUC 7556), at a position (J2000) of
  07 37 56.865  -25 56 58.87
with an uncertainty based on this preliminary data reduction of 0.1-0.2 arcsec  
in each coordinate.  The source is unresolved with our 7.3x2.8arcsec (FWHM)
beam at the most sensitive frequency, 8460.1 MHz.   The observed flux
densities are as follows:

  23 Oct. 1993  MHD 49283      1400   MHz   ---- mJy  rms= 0.4   mJy/bm
     [taken from the NVSS survey]

  18 Jan. 2001  MJD 51927.19   8460.1 MHz   ---- mJy  rms= 0.095 mJy/bm

   9 Sep. 2001  MJD 52161.56   8460.1 MHz   9.59 mJy  rms= 0.071 mJy/bm

  11 Sep. 2001  MJD 52163.58   1425.0 MHz  19.7  mJy  rms= 0.37  mJy/bm
  11 Sep. 2001  MJD 52163.58   4860.1 MHz  13.1  mJy  rms= 0.15  mJy/bm
  11 Sep. 2001  MJD 52163.60   8460.1 MHz   8.18 mJy  rms= 0.067 mJy/bm
  11 Sep. 2001  MJD 52163.60  14939.9 MHz   6.1  mJy  rms= 0.3   mJy/bm

We estimate the uncertainty in the absolute flux scale as about 5% at most
frequencies, and perhaps 10% at 15 GHz.

  Further radio observations are scheduled.   Optical, infrared, and X-ray
data would be very useful, to see whether anything has recently occurred 
which might explain the development of radio emission so long after the
December 2000 outburst.  Our next radio epochs will be the 12th, the 16th, 
and the 17th.

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

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