Masses of W Ursae Majoris-type(W UMa) binaries play a critical role in investigating stellar dynamical evolutionary status. In this paper, we combine the PARSEC(PAdova and TRieste Stellar Evolution Code) with the Roch...Masses of W Ursae Majoris-type(W UMa) binaries play a critical role in investigating stellar dynamical evolutionary status. In this paper, we combine the PARSEC(PAdova and TRieste Stellar Evolution Code) with the Roche geometric model to provide a method to determine the masses of W UMa systems. To verify the validity of this method, we compile a sample of 140 spectrum binaries from the literature, which includes 76 W-and 64 A-subtype systems with reliable physical parameters. We find that the average fractional difference and the standard deviation(σM) of the residuals for W-subtype and Asubtype approximately amount to 15.66% and 0.1218, 16.03% and 0.2094, respectively. Meanwhile, we also perform detailed analyses in accordance with the orbital period, the effective temperatures and the mass ratio. We find that the method is more applicable to determine masses for W UMa systems with low effective temperature and short period.展开更多
2月27日,影视行业从业者与爱好者们齐聚北京,共同参与了“Blackmagic URSA Cine 12K电影摄影机工作坊”活动。此次活动为大家提供了深入了解Blackmagic URSA Cine 12K电影摄影机以及交流分享的机会,参与者积极体验,交流氛围热烈。活动伊...2月27日,影视行业从业者与爱好者们齐聚北京,共同参与了“Blackmagic URSA Cine 12K电影摄影机工作坊”活动。此次活动为大家提供了深入了解Blackmagic URSA Cine 12K电影摄影机以及交流分享的机会,参与者积极体验,交流氛围热烈。活动伊始,Blackmagic Design中国区总经理曹晨辉对品牌进行了基本介绍(如图1)。展开更多
基金supported by the National Natural Science Foundation of China(No.11661161016)the program of Tianshan Youth(No.2017Q091)+1 种基金the 13th Five-year information Plan of Chinese Academy of Sciences(No.XXH1350303-107)the Natural Science Foundation of Yunnan Province(No.2017HC018)。
文摘Masses of W Ursae Majoris-type(W UMa) binaries play a critical role in investigating stellar dynamical evolutionary status. In this paper, we combine the PARSEC(PAdova and TRieste Stellar Evolution Code) with the Roche geometric model to provide a method to determine the masses of W UMa systems. To verify the validity of this method, we compile a sample of 140 spectrum binaries from the literature, which includes 76 W-and 64 A-subtype systems with reliable physical parameters. We find that the average fractional difference and the standard deviation(σM) of the residuals for W-subtype and Asubtype approximately amount to 15.66% and 0.1218, 16.03% and 0.2094, respectively. Meanwhile, we also perform detailed analyses in accordance with the orbital period, the effective temperatures and the mass ratio. We find that the method is more applicable to determine masses for W UMa systems with low effective temperature and short period.
文摘2月27日,影视行业从业者与爱好者们齐聚北京,共同参与了“Blackmagic URSA Cine 12K电影摄影机工作坊”活动。此次活动为大家提供了深入了解Blackmagic URSA Cine 12K电影摄影机以及交流分享的机会,参与者积极体验,交流氛围热烈。活动伊始,Blackmagic Design中国区总经理曹晨辉对品牌进行了基本介绍(如图1)。
