Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..341c&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 109, no. 1669, p. 341-344
Astronomy and Astrophysics
Astronomy
Companion Stars, Faint Objects, Mira Variables, Stellar Spectra, Classifications, Iue, Light Curve, Ultraviolet Spectroscopy, White Dwarf Stars
Scientific paper
Spectra of the Mira variables S Leo and U Cnc were taken near minimum light to search for faint companions. The spectra were expected to show an increase in flux in the blue continuum of the spectrum (wavelengths shortward of 5,000 A), if a hot, faint companion exists. The spectrum of S Leo does not show a rise in the blue end of its spectrum which suggests that it does not have a hot, faint companion. The spectrum of U Cnc has very weak Ca II K and H lines, and the continuum appears uniform shortward of 5,000 A. This suggests that U Cnc may have a companion. The blue continuum of the spectrum of U Cnc can be fit with a 10,000 K, and a 0.001 solar radius blackbody. The temperature is a lower limit and the radius is an upper limit. The temperature and the radius of the possible companion are similar to the temperature and radius of a white dwarf star. However, if a white dwarf companion exists, its apparent magnitude would be too faint to significantly contribute to the spectra of U Cnc. So we are left with the possibility of a companion, but its nature remains questionable. In addition to the search for ccompanions, the spectra are used for classification of S Leo and U Cnc at minimum. S Leo is found to be similar to an M4e-M5e type star and U Cnc is found to be similar to an M5e-M6e type star. These classifications are consistent with their average spectral types.
Castelaz Michael W.
McCollum Bruce
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