On the Source of Optical Variability and Outflow in
Z CMa System
S.A. Lamzin1, M. Teodorani2,
L. Errico2, A.A. Vittone2, E.A. Kolotilov3,
A.S. Miroshnichenko4 and R.V. Yudin4
1 Sternberg Astronomical Institute, Moscow V-234, 119899 Russia
2 Osservatorio Astronomico di Capodimonte, Via Moiariello 16,
I-80131 Napoli, Italy
3 Sternberg Astronomical Institute, Crimean Laboratory, Crimea,
334413 Nauchny, Ukraine
4 Central Astronomical Observatory of the Russian Academy of Sciences
at Pulkovo, 196140, Saint-Petersburg, Russia
We discuss our new and already published photometric and spectroscopic data
regarding the binary system Z CMa and conclude that these data, in contrast
to wide spread opinion, do not contradict the hypotesis that a FU Ori type
secondary rather than the IR primary is the main source of the observed
optical variations and outflow. In the frame of this hypothesis, we explain
observed larger polarization in the emission lines than in the continuum as
a result of Thomson scattering of line quanta inside the region of their
formation.
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