DZ Lyn:a contact binary with components in poor thermal contact  

作　　者：Massimiliano Martignoni Francesco Acerbi Carlo Barani 

机构地区：[1]Via Don G. Minzoni 26/D,20020 Magnago(MI),Italy [2]Via Zoncada 51,26845 Codogno(LO),Italy [3]Via Molinetto 35,26845 Triulza di Codogno(LO),Italy

出　　处：《Research in Astronomy and Astrophysics》2009年第11期1270-1276,共7页天文和天体物理学研究（英文版）

摘　　要：CCD photometric observations of the short-period eclipsing binary DZ Lyn were obtained during seven nights in March-April 2008 in the B, V, Rc and Ic bands; these observations confirm the short-period （P = 0.378 d） of the system. The presented light curves are analyzed by means of the 2003 version of the Wilson-Devinney （WD） program. A grid of solutions for several fixed values of mass ratio was calculated. The best fitting possible is for a mass ratio of q -- 0.885, a degree of contact f = 0.18 and a low orbital inclination of i = 57.6°. The results show that DZ Lyn is an A-subtype W Ursae Majoris contact binary in poor thermal contact; in fact the difference between the mean temperatures of the components is about 1800 K. The star DZ Lyn seems to be another member of the class of poorly understood close binaries in or near geometrical contact but far from thermal contact. The absolute dimensions are estimated and its dynamical evolution is inferred.CCD photometric observations of the short-period eclipsing binary DZ Lyn were obtained during seven nights in March-April 2008 in the B, V, Rc and Ic bands; these observations confirm the short-period （P = 0.378 d） of the system. The presented light curves are analyzed by means of the 2003 version of the Wilson-Devinney （WD） program. A grid of solutions for several fixed values of mass ratio was calculated. The best fitting possible is for a mass ratio of q -- 0.885, a degree of contact f = 0.18 and a low orbital inclination of i = 57.6°. The results show that DZ Lyn is an A-subtype W Ursae Majoris contact binary in poor thermal contact; in fact the difference between the mean temperatures of the components is about 1800 K. The star DZ Lyn seems to be another member of the class of poorly understood close binaries in or near geometrical contact but far from thermal contact. The absolute dimensions are estimated and its dynamical evolution is inferred.

关 键 词：BINARIES eclipsing -- stars fundamental parameters -- stars individual DZ Lyn 

分 类 号：P141.2[天文地球—天体物理]