Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3689: Prob. SN IN NGC 4490; AM Her; N Aql 1982; KR Aur; P/SCHWASSMANN-WACHMANN 1

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 3688  SEARCH Read IAUC 3690
IAUC number

                                                  Circular No. 3689
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 617-864-5758

     Paul Wild, Astronomical Institute, Berne University, reports
his discovery of a probable supernova 35" east and 20" south of the
nucleus of NGC 4490 (= Arp 269; R.A. = 12h28m.2, Decl. = +41o54', equinox
1950.0).  The photovisual magnitude on Apr. 15 UT was ~ 16.

     J. A. Mattei, American Association of Variable Star Observers,
Communicates that this irregular variable has begun another decline,
according to the following visual magnitude estimates by E. Mayer,
Barberton, OH:  Mar. 29.25 UT, 13.5; Apr. 19.26, [15.0.

     D. C. B. Whittet, M. F. Bode and D. Kilkenny, South African
Astronomical Observatory, telex the following simultaneous optical
and infrared magnitudes of this object, obtained on April 14.14 UT:
U= 13.25, B = 13.85, V = 13.53, R = 12.7, I = 12.2, J = 9.34, H =
7.10,  K = 5.33, L = 3.44.

     A. Shafter, University of California at Los Angeles, writes:
"Spectroscopic observations of the unusual variable star KR Aur
(recently reported to be fading in brightness by Wisniewski and
Ferguson, IAUC 3674; and Popov, IBVS 2095) have revealed the object
to be a close binary system with a 3.907-hr orbital period.  The
orbital period has been derived from sinusoidal velocity variations
(semiamplitude ~ 50 km/s) of the H-alpha emission line.  Based on the
character of the spectrum, which shows broad (~ 750 km/s fwhm) H
and He emission, and the short orbital period, it appears that KR
Aur is a cataclysmic variable."

     The following further total visual magnitude estimates and
coma diameters have been reported: Apr. 16.13 UT, 13.0, 1'.0 (C. S.
Morris, Harvard, MA, 0.25-m reflector); 18.26, 12.5, 0'.7 (A. Hale,
Costa Mesa, CA, 0.20-m reflector); 19.14, 12.6, 0'.8 (Morris); 20.08,
12.4, 1'.2 (Morris).

1982 April 20                  (3689)              Daniel W. E. Green

Read IAUC 3688  SEARCH Read IAUC 3690

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

Valid HTML 4.01!