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IAUC 4659: CH Cyg; 1985 DO2

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IAUC number 

                                                  Circular No. 4659
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


CH CYGNI
     M. F. Bode, Lancashire Polytechnic; and J. Meaburn, University
of Manchester, report:  "High-dispersion (0.165 nm/mm at 500.7 nm,
and 0.220 nm/mm at H-alpha) spectra of this symbiotic star using the
Manchester Echelle spectrograph on the 2.5-m Isaac Newton Telescope
on La Palma show that both H-alpha and [O III] 500.7-nm emission lines
were absent on Sept. 20.93 UT.  A low-dispersion (7.9 nm/mm) spectrum
covering 460-670 nm obtained with the same instrument on Sept. 25.88
confirmed that all nebular lines are now missing, leaving only the
red giant continuum.  Previous high-resolution spectra taken with
the same telescope/instrument combination on 1986 June 28.92 had shown
double-peaked H-alpha and multiple-component [O III] emission lines to
be much stronger than any continuum.  Observations on 1987 July 7.01
and 1988 June 30.03 showed [O III] to be absent, and the double-peaked
H-alpha line weak relative to the continuum.  This work is part of a
spectroscopic survey and monitoring programme of symbiotic stars
being conducted from La Palma and from ESO, La Silla."


1985 DO2
     Ephemeris extension (cf. IAUC 4639):

     1988 ET      R.A. (1950) Decl.     Delta      r       V
     Sept.16     0 26.94    -17 18.1    0.297    1.289    13.6
          21     0 30.45    -22 34.5
          26     0 33.19    -26 50.8    0.347    1.318    14.2
     Oct.  1     0 35.37    -30 10.0
           6     0 37.20    -32 38.1    0.412    1.350    14.8
          11     0 38.90    -34 21.9
          16     0 40.66    -35 28.2    0.490    1.386    15.3
          21     0 42.65    -36 03.3
          26     0 44.96    -36 12.8    0.575    1.424    15.8
          31     0 47.64    -36 01.3
     Nov.  5     0 50.73    -35 32.3    0.667    1.465    16.2
          10     0 54.26    -34 49.0
          15     0 58.23    -33 53.9    0.765    1.507    16.6
          20     1 02.63    -32 49.1
          25     1 07.45    -31 36.8    0.868    1.550    16.9


1988 October 5                 (4659)             Daniel W. E. Green

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