Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.0922w&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #09.22; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
Multicolor (BVRI) light curves of the eclipsing novalike variable TT Tri are presented and fit with a parameter-fitting eclipse model. The mass ratio of TT Tri is poorly constrained in our models, but must lie roughly in the range 0.3 <= q <= 0.9 (where q = M2/M1). Models characterized by mass ratios of q = 0.3 (i = 76.1 deg), q = 0.6 (i = 72.6 deg), and q = 0.9 (i = 70.4 deg) were all capable of providing acceptable fits to the data, although the best fits were achieved for mass ratios near the upper end of the permitted range (q = 0.6 and 0.9). The accretion disk was found to extend to approximately 50 to 60 percent of the distance to the inner Lagrangian point in all models, but came closer to reaching the tidal limit (as expected for steady-state accretion) in the higher mass ratio models. The same behavior was found for the radial temperature profile of the disk, which increased with mass ratio, becoming more consistent with that expected for steady-state accretion in the q = 0.6 and q = 0.9 models. A total of 22 eclipse timings were measured for the system, which yielded an ephemeris for the times of mideclipse given by HJD = 2,453,618.953(3) + 0.1396369(4)E. A comparison of the observed brightness and color at mideclipse with the photometric properties of the best-fitting model suggests that TT Tri lies at a distance of 400-500 pc.
Reed J. K.
Shafter Allen W.
Warren Steven R.
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