The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Grou...The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the targe systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt=7.20×10^(-08)days yr^(-1)and dP/dt=2.54×10^(-08)days yr^(-1),respectively Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96×10^(-7)M_(⊙)yr^(-1)for the LS Del system,and dM/dt=-3.83×10^(-7)M_(⊙)yr-1for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima.The mass ratio fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R q-L_(ratio),and logM_(tot)-logJ_(0)diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.展开更多
为了研究浙江汉族RhDEL表型的分子机理,用吸收放散的血清学方法鉴定RhDEL表型,然后用RHD基因特异的聚合酶链反应-序列特异性(PCR-SSP,polymerase chain reaction-sequence specific prime)和序列分析方法鉴定DEL表型RHD基因的10个外显...为了研究浙江汉族RhDEL表型的分子机理,用吸收放散的血清学方法鉴定RhDEL表型,然后用RHD基因特异的聚合酶链反应-序列特异性(PCR-SSP,polymerase chain reaction-sequence specific prime)和序列分析方法鉴定DEL表型RHD基因的10个外显子和外显子-内含子连接区域可能的变异。结果表明:在122例浙江汉族Rh阴性血型中共检测到35例DEL表型个体,其中RhCCdee、RhCcdee和RhCcdEe表型分别有6例(17.14%)、28例(80.00%)和1例(2.86%)。序列分析发现,RhDEL表型个体的第9外显子都有1227G>A突变。D杂合性试验发现,有29例(RhCcdee,28例;RhCcdEe,1例)存在RHD基因的缺失,有6例(RhCCdee)不存在RHD基因的缺失。结论:RHD1227A是浙江汉族RhDEL表型个体的重要遗传标记。展开更多
基金project was supported by the Scientific Research Projects Coordination Unit of Erciyes University(project number FBA-2022-11737)the TESS mission is provided by the NASA Explorer Program。
文摘The light curve analyses and orbital period variations for two contact binary stars,LS Del and V997 Cyg,are presented in this work which was conducted in the frame of the Binary Systems of South and North project Ground-based photometric observations were performed at two observatories in France.We used the Transiting Exoplanet Survey Satellite(TESS)data for extracting times of minima and light curve analysis of the targe systems.The O-C diagram for both systems displays a parabolic trend.LS Del and V997 Cyg’s orbital periods are increasing at rates of dP/dt=7.20×10^(-08)days yr^(-1)and dP/dt=2.54×10^(-08)days yr^(-1),respectively Therefore,it can be concluded that mass is being transferred from the less massive star to the more massive component with a rate of dM/dt=-1.96×10^(-7)M_(⊙)yr^(-1)for the LS Del system,and dM/dt=-3.83×10^(-7)M_(⊙)yr-1for V997 Cyg.The parameters of a third possible object in the system are also considered.The PHysics Of Eclipsing BinariEs Python code was used to analyze the light curves.The light curve solutions needed a cold starspot due to the asymmetry in the LS Del system’s light curve maxima.The mass ratio fill-out factor,and star temperature all indicate that both systems are contact binary types in this investigation.Two methods were applied to estimate the absolute parameters of the systems:one method relied on the parallax of Gaia DR3,and the other used a P-M relationship.The positions of the systems are also depicted on the M-L,M-R q-L_(ratio),and logM_(tot)-logJ_(0)diagrams.We recommend that further observations and investigations be done on the existence of a fourth body in this system.
文摘为了研究浙江汉族RhDEL表型的分子机理,用吸收放散的血清学方法鉴定RhDEL表型,然后用RHD基因特异的聚合酶链反应-序列特异性(PCR-SSP,polymerase chain reaction-sequence specific prime)和序列分析方法鉴定DEL表型RHD基因的10个外显子和外显子-内含子连接区域可能的变异。结果表明:在122例浙江汉族Rh阴性血型中共检测到35例DEL表型个体,其中RhCCdee、RhCcdee和RhCcdEe表型分别有6例(17.14%)、28例(80.00%)和1例(2.86%)。序列分析发现,RhDEL表型个体的第9外显子都有1227G>A突变。D杂合性试验发现,有29例(RhCcdee,28例;RhCcdEe,1例)存在RHD基因的缺失,有6例(RhCCdee)不存在RHD基因的缺失。结论:RHD1227A是浙江汉族RhDEL表型个体的重要遗传标记。
