Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743218g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #432.18; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We directly measure an apsidal period of 33.15 +/- 0.70 years for the double-lined eclipsing binary V578 Mon, a system of two B0.5 stars in star-forming region NGC 2244 within the Rosette Nebula. As a result of this apsidal period, measured accurately for the first time for this system, we report an updated eccentricity of 0.0778 +/- 0.0005, which differs significantly from the previously reported literature value of 0.0867+/- 0.0006. Also, we report preliminary absolute dimensions for V578 Mon, including masses, radii and temperatures. Finally, we provide a comparison of stellar evolution model predictions against our measurements for these massive stars; the final analysis will represent an important calibration of theoretical stellar evolution for high mass stars, which remain poorly calibrated by empirical measurements. Our analysis combines our own extensive multi-band photometry spanning nearly 40 years and photometry from the literature. Traditionally, apsidal motion of eccentric binary systems is calculated by measuring the effect of periastron advance on primary and secondary times of minima. Here we calculate the apsidal motion of V578 Mon using state-of-the-art eclipsing binary modeling software to take full advantage of our multi-year photometry, which covers multiple phases of the apsidal period, and which exhibits detailed ellipsoidal effects at all phases and epochs, providing a highly accurate measurement of the apsidal period and other stellar parameters.
Garcia Eugenio
Hebb Leslie
Heiser Arnold
Stassun Keivan G.
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