Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...280..235s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 280, May 1, 1984, p. 235-246.
Astronomy and Astrophysics
Astrophysics
28
Eclipsing Binary Stars, Stellar Mass, Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, Absorption Spectra, Accretion Disks, Emission Spectra, H Beta Line, H Gamma Line, Helium Ions, Light Curve, Radial Velocity
Scientific paper
The newly discovered cataclysmic system AC Cnc was observed with the 2.1 m telescope and the IIDS of KPNO. A total of 124 spectra were obtained of this eclipsing double-line system. The co-added spectra show absorption features of the secondary star and the emission lines of the accretion disk which yield a mass ratio of 1.24 plus or minus 0.08. The masses of the white dwarf and the secondary star are 0.82 plus or minus 0.13 and 1.02 plus or minus 0.14 solar mass, respectively. The secondary star appears to be very close to the main-sequence mass-radius relationship. No evidence is found for an s-wave in the hydrogen emission lines. However, there is a third emission-line component which is visible for a portion of the orbital period with radial velocity variations of about 180 deg out of phase with those of the disk.
Honeycutt Kent R.
Kaitchuck Ronald H.
Schlegel Eric M.
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