Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aj....131.2209a&link_type=abstract
The Astronomical Journal, Volume 131, Issue 4, pp. 2209-2215.
Astronomy and Astrophysics
Astronomy
3
Stars: Binaries: Eclipsing, Stars: Individual (Xx Cephei)
Scientific paper
We present new five-color photometric and spectroscopic observations of the Algol system XX Cephei (V=9.13, P=2.3 days). This system is known to have a variable period. From analysis of both the period variations and the light curve we found no support for apsidal motion. However, there is a possible light-time effect. The period changes could also be episodic. Our spectroscopic analysis yielded a classification of A4. We found no evidence of features attributable to the cooler component or of active mass transfer. Our photometric solution, using the Wilson-Devinney modeling program, showed the system to be an Algol configuration with a mass ratio of 0.17. We determined the masses and radii, in solar units, to be M1=1.92, M2=0.33, R1=2.07, and R2=2.32, and the temperatures to be T1=8500 K and T2=4555 K. From the parallax given in the Hipparcos catalog, neglecting reddening, absolute magnitudes of MV=1.73 and 4.43 were determined for the primary and secondary components, respectively.
Angione Ronald J.
Sievers John R.
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