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The establishment of a continuous declination system with photoelectric astrolabe Mark I—An international cooperation between Lintong and Irkutsk
Xu, Jia-yan; Wang, Zheng-ming
We propose a cooperative observational project of using the photo-electric astrolabe Mark I of Shaanxi Observatory in Irkutsk. As the instrument will be equipped with a Z = 45° angle prism, it will have no blind zone when used at latitude ( φ = 52°. Important contribution can be expected to the establishing of fundamental reference system and the …
Variation of QSO color indices with redshift
Fan, Xiao-hui; Chen, Jian-sheng
In this paper we discuss the effect of features in the spectrum of QSOs on their color indices and the consequent variation of the latter with the redshift. As the redshift increases, the various absorption features shortwards of the Lyα emission line enter into the visible region and alter the way in which the color indices vary with the redshift…
A morphological study of the circumstellar dust shell of Herbig Ae/Be stars
Wang, Jun-jie; Hu, Jing-yao
In this paper the Kurucz stellar atmosphere model is fitted to the observed IUE, IRAS, ground-based optical and near-infrared data of 22 Herbig Ae/Be stars. A statistical analysis is made based on energy balance between the central star and the circumstellar shell. It is concluded that the shells are disk-shaped.
COS-B identification of the new γ pulsar PSR 1055-52
Lu, Tan; Song, Li-ming
Using COS-B data we analyzed the timing parameters of PSR 1055-52, the newly discovered γ-ray pulsar by CGRO. We found a significant and similar pulsed structure, thus confirming the CGRO discovery. A comparison of this pulsar with 5 previously known ones is made.