Central Bureau for Astronomical Telegrams
IAUC 4955: MWC 560; NOTICE TO SUBSCRIBERS
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Circular No. 4955
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
MWC 560
T. Tomov, Bulgarian National Observatory, Rozhen, reports:
"MWC 560 is a little observed star, classified by Bond et al. (1984,
B.A.A.S. 16, 516) as symbiotic-like with a strong, variable, high-speed
wind from the hot component. On Jan. 12 and 17 we obtained two spectra
(range 360-490 nm, dispersion 1.8 nm/mm). Emission lines of H beta, H
gamma and H delta are well visible. On the first spectrum very strong
absorption lines are visible up to about H20. These absorption lines
are violet-shifted relative to the emission lines by about -3000 km/s,
and their full width of the continuum level is about 2000 km/s. It is
especially interesting that the profiles of the Balmer lines are not of
P-Cyg type. On the second spectrum the absorptions of all the Balmer
lines show at least four violet-shifted components, with velocities of
about -4000, -3000, -2300 and -600 km/s. The lack of P Cyg-type
profiles, the high velocities of the absorption lines and their multi-
component structure suggest that it is very possible that they formed in
discrete jetlike ejections with a relatively high degree of collimation
and with the direction of the ejection near to the line of sight."
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1990 January 25 (4955) Brian G. Marsden
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