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IAUC 3073: Prob. OPTICAL COUNTERPART FOR LMC X-4; NOVAE; 1936 CA (ADONIS)

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IAUC number 

                                                  Circular No. 3073
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


PROBABLE OPTICAL COUNTERPART FOR LMC X-4
     C. Chevalier, Observatoire de Meudon; and S. A. Ilovaisky, Centre
d'Etudes Nucleaires de Saclay, write that photometric and
spectroscopic observations of the Sanduleak-Philip candidate (IAUC 3023
3039) for LMC X-4 obtained at the European Southern Observatory in
February and March show this star to be a close binary with period
1.410 +/- 0.003 days and a primary minimum on Mar. 13.380 +/- 0.005 UT.
The light curve, of amplitude 0.15 magnitude in B, is double humped
and one maximum is variable in intensity.  The spectrum shows H, He
I and He II in absorption.  The spectral type is about O8, and the
mean radial velocity confirms LMC membership.  The He II 4686 A line
is also present in emission and exhibits periodic radial-velocity
variation (semiamplitude ~ 500 km/s) in phase with the light curve
and such that maximum recession velocity occurs at the variable
maximum in the light curve.  The underlying 4686 A absorption line
shows approximately constant radial velocity to within +/- 50 km/s.


NOVAE
     The following visual magnitude estimates have been reported:

     Nova Sgr 1977.  Apr. 10.33 UT, 9.2 (S. O'Meara, Harvard Obs.);
15.38, 9.3 (J.Bortle, Brooks Obs.); 20.37, 9.4 (Bortle); 30.49,
9.7 (J. Morgan, Prescott, Arizona); May 2.49, 9.9 (Morgan).

     Nova Sge 1977.  Apr. 2.13, 11.8 (G. Hurst, Northampton, Eng.);
10.35, 11.8 (O'Meara); 18.36, 11.9 (Bortle); 30.36, 11.7 (Bortle).

     NQ Vul.  Apr. 2.14, 11.4 (Hurst); 10.35, 11.1 (O'Meara); 18.36,
11.4 (Bortle); 30.48, 11.2 (Morgan); May 2.49, 11.3 (Morgan).

     V1500 Cyg.  Apr. 6.32, 12.8 (O'Meara); 29.35, 12.5 (Bortle).


1936 CA (ADONIS)
     The following precise positions have been measured by C. T.
Kowal, Hale Observatories, from an exposure by S. Kent with the
122-cm Schmidt telescope at Palomar:

     1977 UT             R. A. (1950) Decl.
     Feb. 26.22847    10 18 15.17   +12 01 22.4
          26.23542    10 18 13.90   +12 01 28.1


1977 May 12                    (3073)              Brian G. Marsden

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