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IAUC 3902: V0332+53; 1983 VA

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IAUC number 

                                                  Circular No. 3902
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


V0332+53
     L. Stella and N. E. White, European Space Agency, report that
a more detailed analysis of the EXOSAT observations of V0332+53 on
Nov. 21 and 22 (IAUC 3893) has revealed a coherent 4.4-s modulation
of the x-ray flux.  The pulse profile is variable but on the
average is a double-sine-wave pulse with a peak-to-peak amplitude
of 15 percent.  This modulation was also present in an additional
observation on Nov. 26.  The period is decreasing with P/P-dot = 200 +/-
50 yr from a value of 4.37534 +/- 0.00004 s on Nov. 21.22 UT.  This
rate of decrease is similar to that seen from other x-ray pulsars.
The variance associated with the modulation is < 10 percent of
that caused by the stochastic flickering previously reported.


1983 VA
     R. M. West, European Southern Observatory, reports the
following prediscovery observation:

         1983 UT              R.A.   (1950.0)   Decl.

         Oct. 27.04763      22 32 05.51      -57 31 13.4

     Improved orbital elements from observations Oct. 27-Nov. 11:

          T = 1983 Dec. 17.229 ET
      Peri. =  11.735                    e =   0.68880
      Node  =  76.943   1950.0           a =   2.58208 AU
      Incl. =  16.203                    n =   0.237547
          q =   0.80354 AU               P =   4.15 years

     1983/84 ET  R.A. (1950.0) Decl.      p        r      Mag.

     Dec. 22    16 09.50    - 0 34.6    0.227    0.807    16.9
          27    15 55.00    + 4 59.1
     Jan.  1    15 46.36    + 8 38.2    0.304    0.837    17.1
           6    15 41.65    +11 02.9
          11    15 39.44    +12 41.6    0.382    0.893    17.3
          16    15 38.70    +13 52.5
          21    15 38.70    +14 47.4    0.450    0.968    17.5
          26    15 38.89    +15 33.9
          31    15 38.81    +16 17.0    0.505    1.056    17.7
     Feb.  5    15 38.12    +16 59.5
          10    15 36.56    +17 42.8    0.547    1.152    17.9


1983 December 21               (3902)              Brian G. Marsden

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