Central Bureau for Astronomical Telegrams

IAUC 7708: V4740 Sgr = N Sgr 2001 No. 3; XTE J1650-500

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                                                  Circular No. 7708
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)
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URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


V4740 SAGITTARII = NOVA SAGITTARII 2001 No. 3
     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V4740 Sgr has been given to the nova reported on
IAUC 7706.
     J. D. West, Mulvane, KS, reports the following CCD photometry
for V4740 Sgr:  Sept. 7.085 UT, V = 6.45 +/- 0.05; 7.090, I_c =
6.11 +/- 0.06; 7.131, V = 6.69 +/- 0.05.  W. Liller, Vina del Mar,
Chile, reports broadband V = 6.87 from a CCD image taken on Sept.
7.0039.  West provides the following position measured from one of
his images:  R.A. = 18h11m45s.98, Decl. = -30o30'49".5 (equinox
2000.0).  H. Yamaoka, Kyushu University, reports that the closest
object visible on the Digital Sky Survey red plate (limiting mag
about 20) is a star of red mag about 17 at approximate position end
figures 45s.87, 53".3.  Visual magnitude estimates: Sept. 6.839 UT,
6.6 (A. Pereira, Cabo da Roca, Portugal); 6.915, 6.6 (Pereira);
7.385, 6.5 (J. Bedient, Honolulu, HI); 7.780, 6.9 (K. Hornoch,
Lelekovice, Czech Republic).


XTE J1650-500
     On IAUC 7707, third item, line 7, the Mt. John Observatory
image was obtained on Sept. 7.41 UT.
     P. Groot, Harvard-Smithsonian Center for Astrophysics; S.
Tingay, Australia Telescope National Facility; A. Udalski, Warsaw
University Observatory; and J. Miller, Massachusetts Institute of
Technology, report on behalf of a larger collaboration:  "Radio
observations of the error box of XTE J1650-500 (IAUC 7707) made
with the Australia Telescope Compact Array at 1384 MHz on Sept.
7.27-7.58 UT show a new, about 3 mJy source at R.A. = 16h50m01s.00,
Decl. = -49o57'45".0 (equinox 2000.0; 3" uncertainty), which was
1'.5 away from the RXTE raster-scan position (Markwardt et al.,
op.cit.).  Two 15-min I-band observations of the x-ray error box
were obtained with the OGLE 1.3-m telescope at Las Campanas in non-
photometric weather on Sept. 7.034 and 7.058.  Inspection of the
radio position shows the presence of a new object.  The new source
is 1.8 and 0.8 magnitude fainter than USNO-A2.0 0372-29042342 and
0375-29037362, respectively.  Assuming I = 15.3 and 16.5 for these
two stars, respectively, the new source is currently at I = 17.2
+/- 0.2.  The source is barely visible on Second Epoch Red Survey
plates taken with the U.K. Schmidt telescope.  This source has also
been reported by Castro-Tirado et al. (op.cit.) as the possible
counterpart.  Optical images of the candidate can be found at URLs
http://cfa-www.harvard.edu/~pgroot/XTEJ1650-50DDS.ps and
http://cfa-www.harvard.edu/~pgroot/XTEJ1650-50OGLE.ps."

                      (C) Copyright 2001 CBAT
2001 September 7               (7708)            Daniel W. E. Green

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