近日,中国科学院新疆天文台研究员崔朗牵头的国际合作团队利用欧洲VLBI网(EVN)、中国VLBI网(CVN)联合新西兰Warkworth30米射电望远镜,对射电星AR Sco实施了多历元VLBI相位参考观测,成功测量了该射电星的高精度三角视差和自行,测量精度都...近日,中国科学院新疆天文台研究员崔朗牵头的国际合作团队利用欧洲VLBI网(EVN)、中国VLBI网(CVN)联合新西兰Warkworth30米射电望远镜,对射电星AR Sco实施了多历元VLBI相位参考观测,成功测量了该射电星的高精度三角视差和自行,测量精度都在1%以内。相关成果已发表在《皇家天文学会月刊》(Monthly Notices of the Royal Astronomical Society)上。展开更多
Revised Hipparcos data were released by van Leeuwen in 2007.In this article revised Hipparcos trigo-nometrical parallaxes are used to derive a period-luminosity zero-point in the optical V band.Adopting a fixed slope ...Revised Hipparcos data were released by van Leeuwen in 2007.In this article revised Hipparcos trigo-nometrical parallaxes are used to derive a period-luminosity zero-point in the optical V band.Adopting a fixed slope of -2.81 from the LMC,a zero-point value of ρ= -1.37±0.07 is derived based on the method by Feast and Catchpole(1997).This value yields an LMC distance modulus of 18.64 mag,which makes a minor change in H0 expected from Feast and Catchpole's result in 1997.展开更多
文摘近日,中国科学院新疆天文台研究员崔朗牵头的国际合作团队利用欧洲VLBI网(EVN)、中国VLBI网(CVN)联合新西兰Warkworth30米射电望远镜,对射电星AR Sco实施了多历元VLBI相位参考观测,成功测量了该射电星的高精度三角视差和自行,测量精度都在1%以内。相关成果已发表在《皇家天文学会月刊》(Monthly Notices of the Royal Astronomical Society)上。
基金Supported by the National Natural Science Foundation of China (Grant No. 10673005)Foundation of the Chinese Academy of Sciences (Grant No. KJCX2-YW-T13)
文摘Revised Hipparcos data were released by van Leeuwen in 2007.In this article revised Hipparcos trigo-nometrical parallaxes are used to derive a period-luminosity zero-point in the optical V band.Adopting a fixed slope of -2.81 from the LMC,a zero-point value of ρ= -1.37±0.07 is derived based on the method by Feast and Catchpole(1997).This value yields an LMC distance modulus of 18.64 mag,which makes a minor change in H0 expected from Feast and Catchpole's result in 1997.
