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IAUC 4745: X-RAY PULSAR IN Dir. OF LYNDS 1457; AX Per; 1989B

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                                                  Circular No. 4745
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


X-RAY PULSAR IN THE DIRECTION OF LYNDS 1457
     S. Takano, K. Koyama, Y. Tawara, T. Matsumoto, K. Noguchi, T.
Iwata, N. Takahashi, T. Umemoto, K. Tatematsu, N. Ohashi, and Y. Fukui,
Department of Astrophysics, Nagoya University; and K. Makishima,
Department of Physics, University of Tokyo, write:  "The hard x-ray
source H0253+193 in the direction of the nearest molecular cloud
Lynds 1457 was observed with the x-ray astronomy satellite Ginga on Jan.
23.0-23.4 UT.  The detector field-of-view of 1.0 deg x 2.0 deg FWHM
was centered at the IPC position of the source:  R.A. = 2h53m20.5,
Decl. = +19 14'38" (equinox 1950.0; Halpern and Patterson 1987, Ap.J.
312, L31).  An x-ray pulsation with a period of 206.3 +/- 0.1 s was
discovered with a significance level of 51 sigma.  The average x-ray
intensity was 6 x 10E-11 erg/cm2/s (2-20 keV).  We also found the
x-ray pulsation from the data observed with Ginga previously on 1987
July 28.8-29.3, when the period, the significance level, and the
average intensity were 206.1 +/- 0.2 s, 14 sigma, and 4 x 10E-11
erg/cm2/s (2-20 keV), respectively."


AX PERSEI
     This Z-And star appears to be now emerging from eclipse, somewhat
earlier than expected, as indicated by the following visual magnitude
estimates:  1988 Aug. 27.99, 9.5 (P. Schmeer, Bischmisheim, West Germany;
correction to IAUC 4685); Dec. 30.00 UT, 12.6 (Schmeer); 1989 Jan. 3.81,
12.5 (S. Korth, Dusseldorf, West Germany); 13.89, 12.2 (A. Pereira,
Linda-a-Velha, Portugal); 26.83, 12.6 (A. Boattini, Florence, Italy);
Feb. 2.21, 12.8 (R. Royer, Wrightwood, CA); 8.03, 12.6 (J. E. Bortle,
Stormville, NY); 13.16, 12.6 (Bortle); 24.01, 12.3 (Bortle); 26.02,
11.7 (Bortle); 26.85, 11.9 (Schmeer).


SUPERNOVA 1989B IN NGC 3627
     Further visual magnitude estimates:  Feb. 17.92 UT, 12.0 (J.
Ripero, Madrid, Spain); 19.04, 12.3 (F. Pujol, Madrid, Spain); 20.91,
12.3 (S. Korth, Dusseldorf, West Germany); 22.33, 12.2 (R. Royer,
Lakewood, CA); 23.46, 12.4 (Royer); 24.85, 12.5 (P. Schmeer,
Bischmisheim, West Germany); 25.33, 12.6 (Royer); 25.92, 12.6 (Schmeer);
26.84, 12.8 (Schmeer); 27.24, 12.8 (Royer); 28.21, 12.5 (G. W. Kronk,
Troy, IL).


1989 February 28               (4745)             Daniel W. E. Green

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