Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258...23t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 1, Sept. 1, 1992, p. 23-35. Research supported
Astronomy and Astrophysics
Astronomy
26
Binary Stars, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Balmer Series, Emission Spectra, Optical Thickness, Stellar Spectra
Scientific paper
Variations in star brightness in the object MWC 560 are discussed based on results of UBV photometric observations and high- and low-resolution spectral data. Specific attention is given to the pronounced violet-shifted Balmer absorption component which contrasts the weak Balmer emission lines. Significant changes are noted in the U-B color, and P Cygni profiles are noted in Fe II, Ti II, and the first members of the Balmer series with violet shifts in the absorption component. The results are used to calculate a distance of about 1 kpc to the object, and two types of jet ejections are assumed to emanate from the source. MWC 560 is theorized to be a M4.5 giant/white dwarf binary with high-velocity discrete jet ejections and low-velocity quasi-stationary jet ejections. The two types of jet ejections are shown to explain the dramatic change in reddening and the P Cygni profiles in the later observations.
Antov Alexander
Esipov V.
Georgiev Lachezar
Kolev D.
Mikolajewski Maciej
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