Central Bureau for Astronomical Telegrams
IAUC 4877: MULTI-SITE SPECTROSCOPIC CAMPAIGN IN Dec. 1989; P/SCHWASSMANN-WACHMANN 1
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Read IAUC 4878
Circular No. 4877
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
MULTI-SITE SPECTROSCOPIC CAMPAIGN IN DECEMBER 1989
C. Catala and B. H. Foing write: "We are organizing a worldwide
multi-site campaign to obtain spectra with complete and continuous
time coverage over 72 hr for each of three stars: 48 Per
(Dec. 7-10 UT; search for nonradial pulsations on a Be star;
concentration on He I 667.8 nm); AB Aur (Dec. 11-13; rotational
modulation of winds in a pre-main-sequence Herbig Ae star; concentration
on Ca II K); and V711 Tau = HR 1099 (Dec. 14-17; Doppler imaging
of active regions and flare monitoring on RS CVn stars; concentration
on Fe I, Ca I 643.0-643.9 nm, H-alpha, and Ca II K). The
respective desired resolutions and signal-to-noise ratios for these
stars are: 40 000, > 300; 30 000, > 50; 40 000, > 200. The
telescopes currently involved in this campaign are the University of
Hawaii 2.2-m reflector, 3.6-m Canada-France-Hawaii Telescope, Kitt
Peak McMath, La Silla 1.4-m CAT, Haute Provence 1.5-m reflector,
Crimea 2.6-m Shajn reflector, and Peking Observatory 2.16-m reflector.
In order to reinforce the outcome of this campaign, we solicit
additional spectroscopic and photometric observations of these
stars during and around the period mentioned above. Multi-frequency
coverage from groundbased and space facilities in radio, infrared,
visible, ultraviolet, or x-ray ranges would be also a unique
opportunity for understanding the variability due to oscillations,
instabilities, winds, active structures, or flares. Those interested
in participating should contact Claude Catala (Observatoire de Paris,
Section de Meudon, F-92195 Meudon Principal Cedex, France; telephone
33-1-45077668; e-mail CATALA@MEUDON.SPAN) or Bernard Foing (Space
Science Department, ESA/ESTEC, P.O. Box 299, 2200 AG Noordwijk, The
Netherlands; telephone 31-1719-84958; e-mail BFOING@ESTCS1.SPAN)."
PERIODIC COMET SCHWASSMANN-WACHMANN 1
Total visual magnitude estimates (cf. IAUC 4860):
Sept. 23.25 UT, 12.8 (A. Hale, Las Cruces, NM, 0.41-m reflector);
25.19, 12.5 (Hale); 27.02, 13.2 (S. Garro, Grenoble, France, 0.20-m
reflector); 27.91, 12.9 (Garro); 30.24, 12.5 (Hale); Oct. 1.08,
12.8 (D. W. E. Green, Oak Ridge Observatory, 0.41-m reflector);
3.27, 12.2 (Hale); 5.84, 12.6 (J.-C. Merlin, Le Creusot, France,
0.40-m reflector); 7.30, 12.1 (C. S. Morris, Pine Mountain Club, CA,
0.26-m reflector); 8.32, 12.3 (Morris).
1989 October 13 (4877) Daniel W. E. Green
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