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IAUC 7009: XTE J1550-564; AX J0103-722 = 1SAX J0103.2-7209; R CrB

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                                                 Circular No. 7009
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


XTE J1550-564
     J. Orosz, Pennsylvania State University; and C. Bailyn and R.
Jain, Yale University, report YALO consortium observations using
the Yale 1-m telescope (+ ANDICAM CCD camera) at the Cerro Tololo
Interamerican Observatory:  "We have identified a possible optical
counterpart to the recent x-ray transient XTE J1550-564 (IAUC 7008)
in V-band images obtained on Sept. 8.99 UT.  The candidate is
located at R.A. = 15h50m58s.78, Decl. = -56o28'35".0 (equinox
2000.0), with estimated errors on each value of about 1"-2".  This
object is not visible on an image obtained from the Digitized Sky
Survey.  We estimate a magnitude of V = 16, based on comparions
with nearby stars selected from the Hubble Guide Star Catalog.
Further observations, especially spectroscopic confirmation, are
urgently needed.  A finding chart may be obtained via the World
Wide Web at http://www.astro.psu.edu/users/orosz/xte.html."
     Corrigendum.  On IAUC 7008, line 15, for  6 x 10E-8  read
6 x 10E-9


AX J0103-722 = 1SAX J0103.2-7209
     J. Yokogawa and K. Koyama, Kyoto University, report:  "An ASCA
observation made on 1996 May 21-23 revealed quasisinusoidal
pulsations at a period of 348.9 +/- 0.3 s from a source at R.A. =
1h03m15s, Decl. = -72o09'01" (equinox 2000.0; +/- 1' at 90-percent
confidence), designated as AX J0103-722.  The spectrum was well
fitted with a power law with photon index 0.8 +/- 0.2 and an
absorbed flux of 1.0 x 10E-12 erg sE-1 cmE-2 (2-10 keV).  AX
J0103-722 coincides in position with the new pulsar 1SAX
J0103.2-7209 (period 345.2 +/- 0.1 s; IAUC 6999).  Thus the period
derivative (dP/dt) is found to be -1.7 s/yr.  This source was also
detected on 1993 May 12 and 1997 Nov. 14 with respective fluxes of
1.2 x and 1.1 x 10E-12 erg sE-1 cmE-2 (2-10 keV); however, no
pulsation was discovered."


R CORONAE BOREALIS
     This variable star appears to be fading, as indicated by the
following visual magnitude estimates:  Aug. 18.87 UT, 6.2 (J.
Shanklin, Cambridge, England); 23.92, 6.1 (A. Baransky, Kiev,
Ukraine); 24.81, 6.6 (S. Foglia, Milan, Italy); 24.94, 6.7
(Shanklin); 27.81, 7.0 (Foglia); Sept. 4.81, 8.1 (Baransky); 5.86,
8.1 (A. Pereira, Cabo da Roca, Portugal); 6.84, 8.4 (Baransky);
7.88, 8.3 (Pereira); 8.86, 8.2 (C. Vitorino, Cabo da Roca, Portugal).

                      (C) Copyright 1998 CBAT
1998 September 10              (7009)            Daniel W. E. Green

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