Search Publications
Three Super Active Regions in the Descending Phase of Solar Cycle 23
Guo, Juan; Chen, Jie; Zhang, Yin +12 more
We analyze the magnetic configurations of three super active regions, NOAA 10484, 10486 and 10488, observed by the Huairou Multi-Channel Solar Telescope (MCST) from 2003 October 18 to November 4. Many energetic phenomena, such as flares (including a X-28 flare) and coronal mass ejections (CMEs), occurred during this period. We think that strong sh…
Nuclear Starburst Activity in the Seyfert 2 Galaxy NGC 2273
Gu, Qiu-Sheng; Lei, Shi-Jun; Shi, Lei +2 more
We present spectrophotometric results of the Seyfert 2 galaxy NGC 2273. The presence of high-order Balmer absorption lines (H8, H9, H10) and weak equivalent widths of CaII K λ3933, CN λ4200, G-band λ4300 and MgIb λ5173 clearly indicate recent star-forming activity in the nuclear region. Using a simple stellar population synthesis model, we find th…
Measuring the Fundamental Parameters of Hot Hydrogen-Rich White Dwarfs
Barstow, M. A.
This review considers the observations of hot, hydrogen-rich white dwarf stars, with particular reference to measurements of temperature, surface gravity and composition. Spectroscopic data from a variety of wavelength ranges are required for this work and, in particular, the important contributions from optical, ultraviolet and extreme ultraviole…
Energetics and Propagation of Coronal Mass Ejections in Different Plasma Environments
Lin, Jun
Based on previous work, we investigate the propagation of CMEs in a more realistic plasma environment than the isothermal atmosphere, and find that it is a slightly faster reconnection for flux ropes to break free. The average Alfvén Mach number MA for the inflow into the reconnection site has to be at least 0.013 in order to give a pla…
Determination of the Proper Motions and Membership of the Globular Cluster M3 and of its Orbit in the Galaxy
Chen, Li; Wang, Jia-Ji; Wu, Zhen-Yu
We examine 14 plates of the globular cluster M3 (NGC 5272) taken with the 40 cm refractor at the Sheshan station of Shanghai Astronomical Observatory. The plates span over a period of about 77 years. The positions and absolute proper motions of eight stars in the Hipparcos Catalogue and of 49 stars in the Tycho-2 Catalogue are used as the referenc…
Information from the Kinematics of F and G Stars in the Solar Neighborhood
Zhao, Gang; Shi, Jian-Rong; Chen, Yu-Qin
We have calculated the orbital parameters for 90 stars in Chen et al. and updated the kinematic data for stars in Edvardsson et al. by using the accurate Hipparcos parallaxes and proper motions, and recalculated the α-element abundances in Edvardsson et al. in a way consistent with Chen et al. The two sets of data are combined in a study of stella…
A Filament-Associated Halo Coronal Mass Ejection
Zhang, Jun; Wang, Jingxiu; Nitta, Nariaki
There are only a few observations published so far that show the initiation of a coronal mass ejection (CME) and illustrate the magnetic changes in the surface origin of a CME. Any attempt to connect a CME with its local solar activities is meaningful. In this paper we present a clear instance of a halo CME initiation. A careful analysis of magnet…
Infall and Outflow Activities in the Be star FY CMa
Cao, Hui-Lai
Unusual activity of outflow mass motion connected with infall events was recorded for the B0.5 IVe star FY CMa in February 1987 from both archival IUE spectrograms of circumstellar N resonance lines and optical spectra of Hα and He λ5876 Å emission lines which showed inverse P Cygni-type profiles. We estimate the mass loss rate using ultraviolet S…