Spectroscopic and photometric behaviour of the FU Orionis variable Z Canis Majoris

Details Spectroscopic and photometric behaviour of the FU Orionis variable Z Canis Majoris Spectroscopic and photometric behaviour of the FU Orionis variable Z Canis Majoris

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..126...91t&link_type=abstract

A & A Supplement series, Vol. 126, November II 1997, 91-103.

Other

8

Stars: Individual: Z Cma, Stars: Pre-Main-Sequence, Stars: Be, Stars: Variables: Other

Scientific paper

We present optical and IR photometry, optical multi-dispersion spectroscopy, and IR spectrophotometry of the FU Ori variable Z Canis Majoris, obtained in the years 1984, 1985, 1989 and 1996. A comparison of data obtained in 1984 and 1985 confirms that in 1985 Z CMa underwent a low-power eruption. The enhancement of H alpha emission line, the transition of H beta and Fe ii lines from pure absorption to emission with or without a P~Cygni profile, the appearance of the He i 6678 Angstrom absorption line, a radial velocity increase of about 30% of the P Cygni absorption components, and finally a 0.2-0.3 mag increase of IR luminosity, were all dinstinctive characteristics of this state. Further observations in 1996 show that Z CMa is in a low-luminosity state at V = 10.24 while the appearance of a double-peaked H alpha emission, with the blue component much weaker than the red one, is the most significant spectroscopic variation. Energy distributions in the range 0.4-5 microns, obtained during 1984 and 1985 observational runs, are also presented. Based on observations collected at the European Southern Observatory in La Silla, Chile.

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