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IAUC 3101: 1977l; CH Cyg; NOVALIKE X-RAY SOURCE IN Nor

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IAUC number 

                                                  Circular No. 3101
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK     Telex: 921428
Telephone: (617) 864-5758


COMET CHERNYKH (1977l)
     H.-E. Schuster, European Southern Observatory, provides the
following approximate positions, obtained with the 100-cm Schmidt:

     1977 UT          R. A. (1950) Decl.     m1
     Sept. 1.18576    0 18.4     - 4 01    ~13-14
           2.17708    0 18.0     - 4 05    ~13-14

Fuzzy nucleus and some slight indication of a tail to the west.


CH CYGNI
     S. C. Morris, Dominion Astrophysical Observatory, reports that
coude spectrograms obtained in Victoria on Aug. 31 show that an outburst
similar to those observed in 1963 and 1967 (cf. IAUC 2020) is
now in progress.  The normal M7 spectrum is modified by the presence
of a blue continuum and a conspicuous spectrum of permitted
and forbidden emission lines.


NOVALIKE X-RAY SOURCE IN NORMA
     T. G. Hawarden, U.K. Schmidt Telescope Unit, Siding Spring
Observatory, reports that comparison of IIIa-J exposures obtained on
Mar. 18 and July 9 shows no appreciable variation of any object
brighter than B ~ 22 within ~ 2' of the x-ray position (IAUC 3094).
Matched red-broadband and H-alpha-filter exposures on Aug. 18 show no
H-alpha-bright object to a limiting red magnitude of about 19.

     J. Grindlay, Center for Astrophysics, reports that he obtained
a 60-min exposure (IV-N emulsion with RG-695 filter; response
7000-9000 A) on Aug. 24 with the 400-cm reflector at Cerro Tololo
Interamerican Observatory.  Comparison of this plate with identical
exposures made by W. Liller in Aug. 1976 reveals that a stellar
image is present within the x-ray error box (IAUC 3094) at red-infrared
magnitude ~ 21 +/- 1 on the 1977 plate but not on the 1976
plates (i.e. below the plate limit, magnitude 23-24) or on the ESO-B
plate (limit B ~ 21).  The brightening by > 2-3 magnitudes makes
this a prime candidate for the transient source and possibly associated
burst source (Grindlay and Gursky 1976, Astrophys. J. 209, L61).
The object, located at R.A. = 16h08m52s.2, Decl. = -52o17'44" (equinox
1950.0; uncertainty +/- 3"), is roughly centered within a conspicuous
triangle of magnitude ~ 19 stars adjacent to a magnitude ~ 15 star.


1977 September 2               (3101)              Brian G. Marsden

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