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IAUC 2857: N Cyg 1975

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                                                  Circular No. 2857
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 CYGNI 1975
     C. Fehrenbach and Y. Andrillat, Haute Provence Observatory,
report: "Spectrograms obtained during Oct. 2-24 (range 3400-11 300
A) show the following forbidden lines: [O I] 6300 A, 6363 A at
about the same intensity; [O II] 7319-7331 A; [O III] 4363, 4959
and 5007 A; [N II] 5755, 6548 and 6584 A (blended with H-alpha); [Ne III]
3869 and 3967 A; [Ne V] 3426 A.  The other principal emissions are:
H-alpha to H-epsilon; P_6 to P_14; O I (particularly intense) 7772, 8222,
8446, 11 297-11 302 A; He I 5875, 6678, 7065 and 10 830 A; He II 4686 A; C
II 7236 A; C III 4650 A.  All the lines have very similar, complex
structures."

     R. S. Stobie, Royal Observatory, Edinburgh, communicates the
following photoelectric magnitudes.  Comparison stars are HR 8074,
8079, 8089 and 8335.  The R magnitudes are strongly filter dependent
because of the H-alpha emission.

     1975 UT        V     B - V   U - B   V - R   R - I   Observer
     Sept.14.005   6.63   +0.34   -0.46   +1.01   +0.68   Stobie
          15.014   6.78   +0.37   -0.47   +1.01   +0.64     "
          15.836   6.84   +0.32   -0.45   +0.99   +0.63     "
          18.870   7.06   +0.30   -0.41   +0.92   +0.60   Purkins
     Oct.  5.835   8.07   +0.16   -0.40   +0.68   +0.34   Pickup
           7.857   8.16   +0.17   -0.47:  +0.67   +0.31     "

     O. Citterio, G. Conti, P. Di Benedetto and E. G. Tanzi, Laboratorio
di Fisica Cosmica, Milan, report the following infrared magnitudes,
obtained with the 137-cm reflector at Merate Observatory:

     1975 UT      H    J    K      1975 UT      H    J    K
     Sept. 4.0   2.6  2.6  2.1     Sept.19.0   4.9  5.1  4.5
           6.0   3.1  3.2  2.8          25.0   5.6  5.8  5.1
           8.0   3.5  3.6  3.1     Oct.  2.0   6.1  6.3  5.6
          11.0   4.0  4.2  3.5          15.0   6.9  7.0  6.3
          13.9   4.3  4.6  3.9

     Further selected recent visual magnitude estimates: Oct. 11.03
UT, 8.0 (C. Sherrod, North Little Rock, Arkansas); 13.10, 8.2 (P.
Maley, Houston, Texas); 15.11, 8.6 (T. R. Williams, Houston, Texas);
17.08, 8.4 (Maley); 18.11, 8.4 (Maley);.20.27, 8.7 (D. Wallentine,
Albuquerque, New Mexico); 21.12, 8.5 (Maley); 22.1, 8.7 (J. Bortle,
Brooks Observatory); 23.14, 8.4 (Maley); 24.08, 8.5 (Maley).


1975 October 28                (2857)              Brian G. Marsden

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