Other
Scientific paper
Sep 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.276..383f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 276, NO. 2/SEP15, P. 383, 1995
Other
6
Binaries: General - Stars: Chemically Peculiar - Stars: Individual: Υ Sgr - Stars: Individual: Lss 4300 - Stars: Individual: Cpd-58°2721 - Stars: Variables: Other
Scientific paper
Photometric and spectroscopic observations of the extremely hydrogen-deficient binaries υ Sgr, LSS 4300 and CPD-58°2721 have been obtained at Mt. John University Observatory (MJUO) to examine the nature of these systems.
The photometric data do not confirm that υ Sgr is an eclipsing system. These data are also used to examine long-term light and colour variations in the star, which show some longer-term periods of brightness variations which may be indicative of stellar activity in the primary star of this system. The spectroscopic data yield sets of orbital parameters for υ Sgr and LSS 4300. For υ Sgr, these are consistent with the orbital parameters obtained earlier this century. Comparisons are also made between the Hoc profiles of the three systems and phase-related Hα profile variations in υ Sgr discussed. All the observational data provide confirmation for a model involving supersonic mass exchange between the components of the binary system.
Cottrell Peter L.
Frame D. J.
Gilmore Alan C.
Kilmartin Pam M.
Lawson Warrick A.
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