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IAUC 2840: N Mon 1975 (= A0620-00); N Sct 1975

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                                                  Circular No. 2840
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


NOVA MONOCEROTIS 1975 (= A0620-00)
     L. Searle, Hale Observatories, communicates: "J. B. Oke and
J. L. Greenstein, using the multichannel spectrometer on the 508-cm
Hale telescope, find the x-ray nova to have essentially a flat
spectrum, f_nu = 1.0 x 10**-24 erg s**-1 cm**-2 Hz**-1 over the range log nu =
14.45-15.00.   The observations were made on Aug. 31.5, Sept. 1.5,
3.5 and 4.5 UT, and the apparent visual magnitude was 11.35 on all
four nights.  The continuum can be derived from a very hot source,
in which case the visual interstellar absorption is 1.3 magnitudes.
The diffuse interstellar band 4430 A may be present.  Very weak emission
lines H-alpha, H-beta, H-gamma, H-delta, H-epsilon, He II 4686 A and perhaps
O III 3444 A are present.  The radio, optical and x-ray fluxes are all
approximately the same."

     R. Kirshner, Kitt Peak National Observatory, communicates the
following photoelectric observations by H. French: Sept. 9 UT, V =
11.47 +/- 0.08, B-V = +0.24 +/- 0.02, U-B = -0.79 +/- 0.02; Sept. 10, V =
11.46, B-V = +0.27, U-B = -0.78.

     K. Locher, Grut-Wetzikon, Switzerland, sends further visual
magnitudes: Sept. 8.14, 11.4; 9.15, 11.5; 13.10, 11.4; 14.10, 11.6.


NOVA SCUTI 1975
     P. Pesch, Warner and Swasey Observatory, communicates the
following remarks by P. Chen on image-tube spectrograms (dispersion
100 A/mm) taken with the 91-cm telescope on Sept. 22.08 UT: "The
nova is now in the final nebular stage (~ 5 magnitudes below and
after maximum in McLaughlin's description).  The 4959, 5007 A features
are strong and distinct; the profiles are almost square with
width ~ 30 A (~ 2000 km/s).  H-beta has also narrowed down to a square
profile of width ~ 2000 km/s.  H-gamma + [O III] 4363 A is strong with a
total width of ~ 50 A (~ 3000 km/s)."

      Further selected visual magnitude estimates: Aug. 29.0, 10.3
(R. Lukas, Wilhelm Foerster Observatory); Sept. 2.81, 10.5 (M.
Kiehl, Wilhelm Foerster Observatory); 4.05, 11.2 (J. Bortle, Brooks
Observatory); 7.84, 10.6 (Kiehl); 11.04, 11.2 (Bortle); 13.9, 10.4
(Lukas); 15.05, 11.1 (Bortle); 15.14, 11.4 (C. Sherrod, North Little
Rock, Arkansas); 18.14, 11.4 (Sherrod).


1975 September 25              (2840)              Brian G. Marsden

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