The young star cluster system in the Antennae: evidence for a turnover in the luminosity function     

P. Anders  N. Bissantz  L. Boysen  R. de Grijs  U. Fritze-v.Alvensleben 《Monthly notices of the Royal Astronomical Society》2007,377(1):91-106

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Historical Evidence for the Birth of the Newly Discovered Pulsar PSR J1833-1034     

Zhen-Ru Wang  Min Li  Yi Zhao Astronomy Department  Nanjing University  Nanjing  Institute of Chinese Classics  Nanjing University  Nanjing 《中国天文和天体物理学报》2006,6(5)

Stimulated by the recent discovery of PSR J1833-1034 in SNR G21.5-0.9 and its age parameters presented by two groups of discovery, we demonstrate that the PSR J1833-1034 was born 2053 years ago from a supernova explosion, the BC 48 guest star observed in the Western Han (Early Han) Dynasty by ancient Chinese. Based on a detailed analysis of the Chinese ancient record of the BC 48 guest star and the new detected physical parameters of PSR J1833-1034, agreements on the visual position, age and distance between PSR J1833-1034 and the BC 48 guest star are obtained. The initial period P0 of PSR J1833-1034 is now derived from its historical and current observed data without any other extra assumption on P0 itself, except that the factor PP is a constant in its evolution until now.  相似文献   

银河系卫星星系研究进展     

康熙 《天文学进展》2011,29(1):1-18

对银河系内卫星星系进行全面的"人口普查"具有重要的意义。目前已经发现了二十几个卫星星系,其光度范围分布很广,最暗的矮星系比球状星体还暗。叙述了卫星星系的光度分布、空间分布和动力学性质。总结了观测和理论研究进展,并讨论了星流和伽玛射线在研究银河系结构和暗物质性质方面的贡献。表明了卫星星系的统计分布能用来很好地限制冷暗物质理论和星系形成的相关物理过程,同时指出当前研究的局限性和可能的发展方向。  相似文献   

星系NGC5018的星族合成研究     

孔旭  张文浩  李成  程福臻  A.Weiss 《天文学报》2002,43(3):264-271

利用星团谱样本的星族合成方法,研究了邻近巨椭圆星系NGC5018中的星族成分和其内部的恒星形成历史,给出了星系中不同年龄和金属丰度星族的成分占有比.星族合成结果表明,NGC5018中不仅存在大量金属丰度低的年老恒星成分,而且较年轻的星族成分(T=5×108yr)对星系光度贡献也很重要.星系吞并和相互作用过程可能是触发这些较年轻星族形成的物理原因,椭圆星系内部的恒星形成历史可能是2次爆发或者多次爆发过程.这些结果可以很好地解释NGC5018颜色偏蓝、Mg2谱指数强度偏弱等观测特征.  相似文献   

CIRPASS near-infrared integral-field spectroscopy of massive star clusters in the starburst galaxy NGC 1140     

R. de Grijs  L. J. Smith  A. Bunker †  R. G. Sharp  J. S. Gallagher iii  P. Anders  A. Lançon  R. W. O'Connell  I. R. Parry 《Monthly notices of the Royal Astronomical Society》2004,352(1):263-276

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Analysis of high-resolution spectra of mildly metal-poor stars I. Spectral data and equivalent widths     

Jia-yong Zhong  Gang Zhao  Hong-mei Qiu 《Chinese Astronomy and Astrophysics》2002,26(4):424-431

A number of high resolution and high signal-to-noise ratio spectra of mildly metal-poor stars were obtained with the coudé echelle spectrograph attached to the 2.16m telescope at Xinglong Observation Base of Beijing Astronomical Observatory. The spectra of seven mildly metal-poor stars were processed with the MIDAS software package, and the equivalent widths of their spectral lines were measured. The measured equivalent widths together with an error analysis are presented.  相似文献   

Gemini/GMOS spectra of globular clusters in the Leo group elliptical NGC 3379     

Michael Pierce  Michael A. Beasley  Duncan A. Forbes  Terry Bridges  Karl Gebhardt  Favio Raul Faifer  Juan Carlos Forte  Stephen E. Zepf  Ray Sharples  David A. Hanes  Robert Proctor 《Monthly notices of the Royal Astronomical Society》2006,366(4):1253-1264

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Near-infrared surface brightness fluctuations and optical colours of Magellanic star clusters     

R. A. González-Lópezlira  M. Y. Albarrán  M. Mouhcine  M. C. Liu †  G. Bruzual-A.  B. de Batz 《Monthly notices of the Royal Astronomical Society》2005,363(4):1279-1289

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大质量年轻星体新的C18O(1-0)发射     

张燕平  孙锦  孙艳春  孙金江 《天文学报》2002,43(1):33-40

利用紫金山天文台青海观测站13.7米的毫米波望远镜对74个大质量年轻星体或候选进行了C^18O(1-0)的谱线观测。在63个源中观测到了C^18O(1-0)发射，其中57个天体第一次探测到C^18O(1-0)谱线发射。根据谱线辐射温度（TR^*)和半宽（△V），利用LTE方法计算了每个测量源的C^18O(1-0)发射的光学厚度和C^18O(1-0)分子的柱密度。讨论了^13CO(1-0)和C^18O(1-0)的谱线强度比和积分强度比。  相似文献   

具有硅酸盐尘埃特征碳星的新的候选者   总被引：1，自引：1，他引：0  

陈培生  高衡 《天文学报》1994,35(4):443-447

本文根据红外天文卫星的宽波段测光及低分辨率光谱资料，给出了两颗新的可能具有硅酸尘埃特征的碳星及４颗可能的候选者。  相似文献