[vsnet-alert 1633] CI Cam (Hjellming)

[Taichi Kato <tkato>]

From owner-vsnet-err@kusastro.kyoto-u.ac.jp Sat Apr  4 11:04 JST 1998
Date: Sat, 4 Apr 1998 11:00:32 +0900 (JST)
To: rhjellmi@nrao.edu
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Subject: [vsnet-err 60020] Submission to "vsnet-alert" rejected
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Date: Fri, 03 Apr 1998 18:56:59 -0700
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From: "Robert M. Hjellming (Bob)" <rhjellmi@aoc.nrao.edu>
Cc: rhjellmi@arana.aoc.nrao.edu, amiodusz@arana.aoc.nrao.edu,
        mrupen@arana.aoc.nrao.edu
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Subject: [vsnet-alert 0] IAU Circular submission on XTE J0421+560 (= CI Cam)
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The following submission to the IAU Circulars describes
our current conclusion from the VLA data of April 2 and 3.
There will be a long VLBA imaging run on this source 
tomorrow.

If you plot the radio spectra you will see why this
is an EXCEPTIONALLY quickly evolving synchrotron radiation
source.

>Date: Fri, 03 Apr 1998 17:38:13 -0700
>To: BMARSDEN@CFA.HARVARD.EDU, DGREEN@CFA.HARVARD.EDU
>From: "Robert M. Hjellming (Bob)" <rhjellmi@nrao.edu>
>Subject: IAU Circular submission on XTE J0421+560 (= CI Cam)
>Cc: rhjellmi, amiodusz
>
>
>XTE J0421+560 AND CI CAMELOPARDALIS
>
> R. M. Hjellming and A. J. Mioduszewski, National Radio
>Astronomy Observatory, report: "VLA observations of 
>CI Cam on Apr 3.83 UT reveal the presence of an 
>unresolved point source with preliminary flux densities 
>of 120, 470, 650, 500, and 420 mJy at 1.4, 4.9, 8.4, 
>14.9, and 22.5 GHz, respectively.  This indicates that 
>it was optically thick at the two lower frequencies 
>and close to optically thin at the two higher frequencies. 
>The size of the source is less than 0.1" at 22.5 GHz.
>We reanalyzed the 1.4 GHz data for April 2.63 UT (IAUC 6827) 
>and were able to also image the source at 4.9 and 8.4 GHz, 
>so we can report preliminary flux densities of 20, 150, and 
>280 mJy at these three frequencies on April 2.63 UT; at 
>that time the spectrum was optically thick with a spectral 
>index of about 1.5. The rapid variability of factors of ~6, 
>~3, and ~2.3 at 1.4, 4.9, and 8.4 GHz, respectively, 
>indicates that this is synchrotron radio emission which 
>is probably related to the X-ray transient XTE J0421+560 
>(IAUC 6855,6857).  Since the position of the unusual
>radio source coincides with the "symbiotic" star CI Cam, 
>the radio emission and X-ray transient can both be 
>identified with CI Cam."  
>
>
>
>

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