Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 3544: 1E 1145.1-6141; HDE 245770; SN IN NGC 6946

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 3543 SEARCH Read IAUC 3545
IAUC number 

                                                  Circular No. 3544
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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


1E 1145.1-6141
     J. B. Hutchings, A. P. Cowley and D. Crampton, Dominion
Astrophysical Qbservatory, report: "Cerro Tololo Interamerican
Observatory spectra of the star lying within 5" of the Einstein High
Resolution Imager x-ray position for this pulsar show that it is a
reddened supergiant of spectral type ~ B3.  The star is at position R.A.
= 11h45m02s.3, Decl. = -61o40'33" (equinox 1950.0), and has V ~ 12 and
B ~ 14.  No He II 468.6-nm emission is seen.  These quantities are
consistent with the implied low Lx/Lopt value, the x-ray cut-off
and the long binary period proposed by White et al. (1980, Ay.J.
239, 659).  Further observations of this star are desirable."


HDE 245770
     C. Bartolini, A. Dapergolas, A. Guarnieri and A. Piccioni,
Istituto di Astronomia, University of Bologna; and A. Giangrande
and F. Giovannelli, Istituto di Astrofisica Spaziale, Frascati,
telex: "Photoelectric photometry of HDE 245770 carried out at
Bologna Observatory on Oct. 13, 20, 21, 22 and 28 during an x-ray
flare of A0535+262 (cf. Oda et al., IAUC 3525 and 3527) does not
reveal any particular optical activity.  The star is at the same
luminosity level of 1980 Feb. (Giovannelll et al. 1980, Proc. Sec-
ond European IUE Conf.), the mean magnitudes being V = 8.886, B-V =
+0.566 and U-B = -0.595."


SUPERNOVA IN NGC 6946
     R. Wood, Royal Greenwich Observatory, communicates the following
precise position obtained by Clements: R.A. = 20h34m26s.67, Decl. =
+59o55'56".4 (equinox 1950.0; mpg ~ 12 on Nov. 10).

     R. J. Buta, Department of Astronomy, University of Texas at
Austin, reports the following photoelectric observations made by M.
Newberry and himself with the 0.76- and 0.91-m reflectors, respectively:
1980 Nov. 4.15 UT, V = 11.38, B-V = +0.40, U-B = -0.57;
5.11,  11.40, +0.39, -0.54; 6.10, 11.42, +0.41, -0.52; 7.11, 11.45,
+0.42, -0.50; 8.10, 11.51, +0.44, -0.46; 9.09, 11.54, +0.45, -0.46;
10.10, 11.59, +0.47, -0.42; 11.14, 11.63, +0.48, -0.37; 12.12,
11.68, +0.50, -0.33.


1980 November 26               (3544)              Daniel W. E. Green

Read IAUC 3543 SEARCH Read IAUC 3545

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

Valid HTML 4.01!