2011 IOAA数据分析试题

1．分析光变亮度极小时间食双星仙后座V1107是典型的大熊座W型短周期食变双星,图1为它在一个周期内观测得到的光变曲线,可见一个主极小和一个次极小。     

High Spatial Resolution X-Ray Spectroscopy of Cas A with Chandra

We present high spatial resolution X-ray spectroscopy of the supernova remnant Cassiopeia A with the Chandra observations. The X-ray emitting region of this remnant was divided into 38 × 34 pixels of 10″× 10″ each. Spectra of 960 pixels were created and fitted with an absorbed two component non-equilibrium ionization model. From the results of the spectral analysis we obtained maps of absorbing column density, temperatures, ionization ages, and the abundances of Ne, Mg, Si, S, Ca and Fe. The Si, S and possibly Ca abundance maps show obvious jet structures, while Fe does not follow the jet but seems to be distributed perpendicular to it. The abundances of Si, S and Ca show tight correlations between one another over a range of about two dex. This suggests that they are ejecta from explosive Oburning and incomplete Si-buming. Meanwhile, the Ne abundance is well correlated with that of Mg, indicating them to be the ashes of explosive C/Ne burning. The Fe abundance is positively correlated with that of Si when the latter is lower than 3 times the solar value, and is negatively correlated when higher. We suggest that such a two phase correlation is due to the different ways in which Fe was synthesized.     

仙后座1995新星的光谱天空

１９９５至１９９８四川内用２．１６米望远镜、５０Ａ／ｍｍ色散进行了仙后座１９９５新星的光谱观测。对取得的资料作了谱线证认、连续谱和谱线的流量、气壳膨胀速度、温度等测定,确定了新星气壳的电子密度和温度、估算了新星的抛射质量。指出该新星的若干特点并作了简要讨论。     

静夜

在城市的边缘,一列缓缓前进的火车上,我度过了一个不眠之夜。当卧铺车厢熄灯时,车窗外,隐藏在黑暗之中的点点繁星突然显露出她们的光辉。首先映入眼帘的是北斗七星,没有灯光的影响,开阳双星是那样的清晰可见。接下来是北极星、仙王座、仙后座……北天极附近的星空都亮了起来,给这一片敬夜增添了些许的灿烂。     

大陵五的故事

秋夜星空是寂寥而不失璀璨的,繁华稍退,归于恬静。晚饭过后仰望星夜,夏季大三角已然落幕西山,北天王族星座低调登场。先由容易辨识的北斗七星找到北极星,沿着斗日继续往前走就可以看到“铅笔头”仙王座,附近往东就是“M”形状的仙后座。     

仙后座1995新星的光谱研究

１９９５ 至１９９８ 四年内用２ ．１６ 米望远镜、５０Ａ／ｍ ｍ 色散进行了仙后座１９９５ 新星的光谱观测。对取得的资料作了谱线证认、连续谱和谱线的流量、气壳膨胀速度、温度等测定,确定了新星气壳的电子密度和温度、估算了新星的抛射质量。指出该新星的若干特点并作了简要讨论。     

和彗星相约红土地——昆三中、滇池中学高山天文观测活动

“红土地”夜晚的星空相当美,在城区是绝对见不到那样的景象的。当夜幕降临时,深蓝的天空中点点星光逐渐布满了整个星空。这天晚上还下了雨,不过后面就晴开了。高老师说,雨后的天气是利于天文观测的。