Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6482: X0115+634 AND Cyg X-3; V694 Mon = MWC 560; C/1995 O1

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6481 SEARCH Read IAUC 6483

View IAUC 6482 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 6482
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)


X0115+634 AND CYGNUS X-3
     R. Remillard, Massachusetts Institute of Technology (MIT); and
B. Thomas and T. Takeshima, Goddard Space Flight Center (GSFC),
report for the RXTE ASM Team at MIT and GSFC: "The Be binary/pulsar
X0115+634 is again increasing in x-ray brightness.   Beginning on
Sept. 26, the RXTE All Sky Monitor began detecting the source, with
an average flux of 15 +/- 3 mCrab at 2-12 keV on that day.  By Sept.
30, the average flux had increased to 40 +/- 3 mCrab.  Cygnus X-3
has also displayed increasing brightness.  During Mar.-Aug., the 2-
to 12-keV flux usually varied between 70 and 140 mCrab.  However,
during Sept. most of the average daily measurements were between
140 and 230 mCrab, with increasing variability and spectral
softening.  On Sept. 28 and 29, the average flux was 275 +/- 5
mCrab -- while on Sept. 30, the flux dropped to 146 +/- 3 mCrab
with continued variability on timescales of hours."


V694 MONOCEROTIS = MWC 560
     L. Georgiev, R. Barba, and G. Koenigsberger, Instituto de
Astronomia, Universidad Nacional Autonoma de Mexico; and T. Tomov,
Institute of Astronomy, Bulgarian Academy of Sciences, write:
"Echelle spectra of the peculiar stellar object V694 Mon = MWC 560
(R.A. = 7h25m51s, Decl. = -7 44'.1, equinox 2000.0), obtained with
the 2.1-m telescope of the National Observatory in San Pedro Martir,
during Sept. 16-19 show similar features to those observed during
the last reported active periods of MWC 560 in 1990 Jan. (IAUC
4955) and 1991 Oct. (IAUC 5354, 5355).  Highly blueshifted and
variable absorption is present in H I, He I, Na I, and Ca II, but
only in multiplet 42 of Fe II.  Blue-edge velocities for H-beta are
as follows:  Sept. 16.5 UT, -2030 km/s; 17.5, -2200; 18.5, -2540;
19.5, -3400.  A new active phase appears to be starting."


COMET C/1995 O1 (HALE-BOPP)
     Visual m1 and coma-diameter estimates (B = binoculars):  Sept.
2.86 UT, 5.8, 13' (B. H. Granslo, Fjellhamar, Norway, 10x50 B);
9.14, 5.5, - (R. Keen, Mt. Thorodin, CO, naked eye); 13.11, 5.7,
13' (G. W. Kronk, Troy, IL, 7x35 B); 13.83, 5.4, - (M. V. Zanotta,
St. Barthelemy, Italy, naked eye); 16.11, 5.6, 12' (A. Hale,
Cloudcroft, NM, 10x50 B); 21.83, 5.2, 17' (A. Pereira, Carnaxide,
Portugal, 9x34 B); 30.10, 5.5, 13' (Hale); Oct. 1.84, 5.3, 14' (C.
Vitorino, Cabo da Roca, Portugal, 9x34 B).

                      (C) Copyright 1996 CBAT
1996 October 2                 (6482)            Daniel W. E. Green

Read IAUC 6481 SEARCH Read IAUC 6483

View IAUC 6482 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!