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IAUC 2791: Prob. N IN Sct; BL LACERTAE-TYPE OBJECT; CD -33 12119 AND X-RAY SOURCE 3U 1727-33; Corr

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IAUC number 

                                                  Circular No. 2791
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
Western Union: RAPID SATELLITE CAMBMASS


PROBABLE NOVA IN SCUTUM
     Dr. Paul Wild, Astronomisches Institut der Universitat Bern,
cables the discovery of a possible nova:

     1975 UT         R.A. (1950) Decl.     mpv
     June 15.02778   18 52.7   - 7 47      7.9


BL LACERTAE-TYPE OBJECT
    Dr. Paul Wild, Astronomisches Institut der Universitat Bern,
reports that a compact galaxy of almost stellar appearance, at
(1950) R.A. = 18h31m28s.6, Decl. = 73o10'56", which on The Palomar
Sky Survey is of magnitude 18 or 19, was invisible on photographs
taken between 1960 June to 1965 Sep., but is neatly visible ever
since 1966 Sep.  It is one of the brightest members of the very
distant cluster centered at 18h31m.4, +73o10' (Zwicky Catalogue 4, pp.
206-207, no. 6).


CD -33 12119 AND X-RAY SOURCE 3U 1727-33
     G. Hensberge and E. J. Zuiderwijk, University of Amsterdam and
the European Southern Observatory, report: "The absorption components
of the P-Cygni shaped line H-alpha, H-beta, and H-gamma on coude
spectra (20 A/mm and 30 A/mm) of the peculiar extreme A supergiant
CD -33 12119 (mv = 10.2), taken during the period 1975 May 27-June 8
show large radial verlocity shifts compared with observations by
E. P. J. van den Heuvel during 1974 May 7-12.  The absorption component
of H-alpha is shift by about 50 km/s.

     "This may indicate that H-alpha shows similar variations as in
HD 226868 (Cyg X-1) and HD 77581 (Vela X-1) and suggests that CD
-33 12119 is a good candidate for identification with the x-ray
source 3U 1727-33.  More observations on time scales of a few months
are highly needed."


CORRIGENDUM
     The previous circular, issued 1975 June 17, should of course
be numbered 2790.


1975 June 19                   (2791)              Owen Gingerich

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