Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 4523: EXO 033319-2554.2; Poss. SNe; 1987s

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 4522  SEARCH Read IAUC 4524
IAUC number

                                                  Circular No. 4523
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

EXO 033319-2554.2
     L. Ferrario, D. T. Wickramasinghe and I. R. Tuohy, Australian
National University; and J. Bailey, Anglo-Australian Observatory,
report: "Analysis of spectroscopic observations (range
430-670 nm) obtained with the 3.9-m AAT on 1987 Nov. 27 shows the
presence of broad, resolvable and phase-dependent cyclotron
harmonic features.  The cyclotron emission peaks occur at 655, 545
and 472 nm at the beginning and end of the bright phase and can be
identified with harmonic numbers 5, 6 and 7 in a field of 33 MG.
The features move in wavelength with phase as predicted by the
theory of cyclotron emission and are present only during the bright
phase.  At the time of the observations the system was in a high
state with maximum V about 17.  The field of EXO 033319-2554.2 is
remarkably close to that previously deduced for VV Pup (about 32 MG)
through the detection of cyclotron harmonics."

     C. Pollas, Caussols Observatory, informs us that the possible
supernova in UGC 4060 (cf. IAUC 4521) had faded to B about 18 on 1987
Dec. 29.1 UT.  He reports another possible supernova 7".5 west and
0".5 south of the nucleus of Zw 0752+1430 (R.A. = 7h52m.4, Decl. = +14 30',
equinox 1950.0).  This object brightened from B = 18-19 on 1987
Dec. 20.1 UT to perhaps B = 16-17 on Dec. 29.1 UT.  Confirmation
of both objects by other observers would be useful.

     Total magnitudes: 1987 Dec. 16.42 UT, 5.4 (Y. Sugiyama,
Hiratsuka, Japan, 0.16-m reflector); 18.01, 5.9 (G. R. Chester, Rixeyville,
VA, 7 x 50 binoculars; tail > 4 deg in p.a. 60 deg); 19.81, 5.9
(J.-C. Merlin, Le Creusot, France, 7 x 50 binoculars); 21.11, 5.8
(A. Hale, Las Cruces, NM, 10 x 50 binoculars; 2 deg tail in p.a. 62 deg);
22.13, 5.5 (C. S. Morris, Whitaker Peak, CA, 10 x 50 binoculars;
8-9-deg antitail; broad, very faint sunward tail about 1 deg long); 23.17,
6.2 (D. Levy, Tucson, AZ, 0.08-m refractor; strong, pointed sunward
tail of length 1.5 deg in p.a. 240 deg); 24.19, 5.8 (Hale; 2.5-deg tail
in p.a. 61 deg); 25.88, 6.2 (A. Pereira, Linda-a-Velha, Portugal, 9 x
34 binoculars); 27.09, 6.1 (C. E. Spratt, Victoria, BC, 11 x 80
binoculars); 28.15, 6.2 (Hale; 2 deg tail in p.a. 65 deg; moonlight);
29.86, 6.2 (J. Shanklin, Cambridge, England, 10 x 80 binoculars).

1988 January 1                 (4523)              Brian G. Marsden

Read IAUC 4522  SEARCH Read IAUC 4524

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

Valid HTML 4.01!