利用大视场测光系统评估观测天气质量

介绍一种利用大视场测光系统对观测天气质量进行评估的统计方法。此方法可以给出大气透明度、背景天光、视宁度和观测极限星等等多种与天观测有关的天气质量参数。通过检验证明,此方法可提供一处天气状况的实时监视方法,对北京天台施密特ＣＣＤ测光系统以及制定观测计划的评估观测质量有重要意义。     

光子计数式光电测光系统数据采集和控制软件

本文报告了数据采集和控制软件ＣＭＵＯＰＰＳ的研制情况，这个软件是云南天文中密近双星研究组为泰国清迈大学天文台研制的光子计数式光电测光系统的专用配套软件。文中给出了硬件接口的性能及软件和硬件握手的方案，介绍了软件的总体概况，还说明了软件的使用环境和使用方法。     

Be／X射线双星UBV光电测光的预备性观测

为研究Be/X射线双星的光度变化,正利用北京天文台60cm望远镜进行UBV光电测光。本文叙述一年来的观测。并结合观测结果对观测和归算方法作了若干讨论,我们主要采用较差测光附加标准星观测以便转换到标准系统。消光计算时考虑零点漂移和可能与大气质量平方的线性关系:m-m_0=k′X k″c k_2X~2 k_tt q。标准系统与观测系统的星等和色指数采用线性关系转换。     

基于BATC 1999-2008十年观测值班记录的兴隆天气情况统计

基于BATC巡天组近十年的观测值班记录,统计了兴隆观测站可观测时间随月份的变化,结果表明平均每年大约有195个可观测夜(约1986小时),其中大约有87个观测夜(约918小时)用来巡天,约有18个观测夜用来测光.另外还统计了兴隆观测站施密特望远镜十年来北极天区的观测图像中星像的半高全宽(FWHM)随月份的变化,结果表明一年内平均星像的半高全宽约为2.3像元(老CCD)或2.2像元(新CCD).一般来说,夏季的星像要好于冬季,这与刘颖(Liu)等人2003年[1]的结果基本一致.     

新疆天文台南山1 m宽视场光学望远镜测光系统

测光系统的流量定标是一项重要和基础的工作,其中影响流量定标的主要因素有探测器响应(测光零点)、颜色改正项和大气质量等.利用新疆天文台南山1 m宽视场光学望远镜对Landolt标准天区J054610+45的测光标准星进行了大气质量不同条件下的U,B,V,R,I多波段观测,根据布格定律求得了大气消光系数;并利用2017年1...     

利用IRC进行国际天文遥在观测

１９９７年３月６日至３月７日,我们利用ＩＮＴＥＲＮＥＴＲＥＬＡＹＣＨＡＴ（ＩＲＣ）进行了首次国际天文联合遥在观测试验,并获得了成功。本次试验由分布在全球７个不同地点的工作组联合进行,包括中国、美国、加拿大和英国。这一试验的成功为天文观测开创了一个新型的途径,也是对通过Ｉｎｔｅｒ－ｎｅｔ进行更紧密的国际合作的一种尝试。     

仙王座β型变星νEri的测光和高分辨率分光观测和脉动模示分析

仙王座β型变星νEri的测光和高分辨率分光观测和脉动模示分析@卢方军 @刘学富 @黄河 @茶光伟     

天文观测攻略系列之三十一深空天体观测入门攻略（六）

又到四月,北半球天气回暖,春天来到了。不知不觉,“深空天体观测入门攻略”系列文章又陪大家走过了一年的时光。在这一年里,笔者和读者们一起成长,非常感谢大家一直以来的支持!进入新的一年,笔者要带领大家探寻的深空天体难度也会有所加大。不过不要担心．只要多练习,这些天体你都能拿下!对本系列有任何意见或建议,欢迎给笔者发邮件交流：univer_sezx@bjp．org．cn。     

恒星光电测光观测数据的处理

简要地阐述了恒星光电测光工作中的常规数据处理方法及应该注意的一些问题。对食双星光电测光这一领域的观测数据处理进行了概述,给出了ＢＶ双色光电测光观测数据处理软件包的编程思想及具体实现。最后介绍了这个软件包的使用情况和结果。     

现代日晕光度计多波段测光系统初步测试结果分析

现代日晕光度计是用于精确测定监测址点的多种大气参量的精密仪器,它已列为我国西部太阳设备选址工作中的重要设备。利用同一架日晕光度计首先对昭通大山包进行了多波段数据采集。在仔细分析初步测光结果的基础上,进一步完善日晕光度计的光学系统。使用改进后的设备对昆明凤凰山址点进行了多次数据采集,都获得了理想数据。这表明日晕光度计的多波段测光系统已能够用于西部太阳选址工作中。     

Photometry of the low-luminosity spiral galaxy NGC 4136

Multicolor BVRI surface photometry of the low-luminosity (M _V ≈?18^m) spiral galaxy NGC 4136 is presented. The photometric parameters of its components and the color distribution over the galactic disk are estimated. The color indices and the corresponding effective ages are determined for the brightest star-forming regions. The disk-to-dark halo mass ratio is derived from the measured rotation curve of the galaxy. The disk mass dominates within the optical boundaries of the galaxy, so its disk can be considered as a self-gravitating system.     

Surface Photometry of Comet Hale-Bopp Carbon Images

A very long series of photographic observations of the comet Hale-Bopp has been made during January–April 1997 at the double astrograph (400/2000) of the Main Astronomical Observatory (Kyiv, Ukraine). Some of the cometary photos were obtained with two wide-band filter combinations. One of these combinations isolates C₂ emission, another — the nearby dust continuum. The images were digitized by means of AMDPH-XY machine and then calibrated following the standard procedure. After subtraction of the dust continuum the distribution of surface brightness in the C₂ emission coma of comet Hale-Bopp was studied. We found an asymmetric brightness distribution both pre- and post-perihelion. On 21.77 April 1997 a secondary brightness peak is found at the distance of 1.03 × 10⁵ km from the nucleus. It is possible that this peak is related to the extended source of the C₂ molecules. This revised version was published online in July 2006 with corrections to the Cover Date.     

云台便携式光电光度计以及天光背景的测定方法

首先详细介绍了云台便携式光电光度计的结构和设计思想,然后叙述了如何利用云台便携式光电光度计测定天光背景.     

高精度恒星孔径测光注释

详细介绍了利用孔径测光方法得到CCD图像中恒星仪器星等的全过程,以及使用自己设计的程序对云南天文台1m望远镜观测的CCD图像进行实际测量的实验。测量结果表明:对亮星(约10mag)的内部测量精度能达到0.003mag,而对暗星(约17mag)达到0.2mag。同时,对相关问题进行深入讨论,总结了一些实验所得的经验,并与测光软件IRAF进行了内部精度的比较。     

CCD Photometry of Asteroids 38, 174, 276 and 346

Photometric observations of the four selected asteroids, obtained at Yunnan Observatory, China during recent two years, are presented and analysed. We have determined the synodic periods of (174)\, Phaedra and (276)\, Adeldheid as 5.74h ± 0.01 and 6.29h ± 0.01,which confirmed the previous results. For (38)\, Leda and (346)\, Hermentria, we derived their period values, 10.171h ± 0.007 and 19.408h ± 0.005 for the first time. The color-indices of 38, were re-determined as 0.73 ± 0.02 for B-V and 0.41 ± 0.02for U-B, respectively, which are the same as the ones given by Tedesco (1989).     

Photometry of groups of galaxies. II. The NGC 972 group

A nearby group of galaxies, centered at the spiral galaxy NGC 972 and conspicuously rich in faint dwarf spheroidal galaxies, has been investigated photometrically on the B and V plates, obtained with the Tautenburg 2m Schmidt telescope. For ten certain and probable group members the equivalent B and V brightness profiles have been extracted. Integrated magnitudes and mean colours of faint group members have been estimated. Typically, the dwarfs show a “subexponential” (i.e. a convex curvature over the linear radius) surface brightness profile and often a central excess. Their equivalent profiles are reasonably well fitted by modified isothermal (King) models.     

北京天文台兴隆观测站夜天光光谱证认

介绍了夜天光光谱的观测方法,给出了北京天文台兴隆观测站５３０ｎｍ－８２０ｎｍ的夜天光发射光谱,并对它们进行了证认,测定了大气辉光线的夜变化;光谱中城市灯光线ＮａＩ和ＨｇＩ均较弱,表明兴隆站目前的光污染尚不严重．     

Photometry of the Supernova SN 2002ap in M 74 during 2002

UBVR _c I _c observations of SN 2002ap during February, October, and November 2002 at the Crimean Astrophysical Observatory are reported. An examination of our photometric data, along with published data, shows that over a period of about a year from the day the SN 2002ap supernova burst, the light curve passed through three developmental stages: a sharp rise, followed by a stage of rapid exponential decrease, and then a slower fading. Based on the shape of the light curve, this supernova is of type SN I, but according to the variation in its color indices, it more likely belongs to the SN Ic supernovae. In the premaximum stage, the energy distribution from 3000 to 6000 resembles the emission from a star of spectral class F5V. In the second stage of the light curve evolution, when the brightness falls off rapidly, the changes in the color indices are associated with a change in the radiation temperature indicative of rapid cooling of the ejected material. Taking the effective radiation temperature in the premaximum stage to be T _eff 6500 K, we estimate the expansion velocity of the quasiphotosphere to be about 9700 km/s.     

Narrow-Band Photometry of Comet C/1995 O1 (Hale-Bopp)

Photometric observations of comet C/1995 O1 (Hale-Bopp) carried out at the Stará Lesná Observatory since February to April 1997 are analyzed and discussed. Emission band fluxes and continuum fluxes are presented, from which the total numbers of molecules in the columns of the coma encircled by diaphragms are calculated. The production rates are estimated from the conventional Haser model. We found that the photometric exponent of dust contribution two months prior perihelion was n = 5.2. The photometric exponent n of the cometary magnitude solely to the C₂ emission alone equals 3.3 and that of CN equals 2.5. These values can be explained by a fact that the maximums of production rates of the gases were reached between March 2and 12 and not at the perihelion as it is valid for dust. These results are compared with the values of 1P/Halley (1986 III) under the similar conditions, obtained with the same method and instrument. C/Hale-Bopp exhibited 4.1 times more molecules radiating the CN-emission than 1P/Halley in the same column of the coma. The continuum flux of C/Hale-Bopp was also very strong. The ratios (to 1P/Halley) are 94:1 (Cont. 484.5) and 74:1 (Cont. 365.0). The cometary colour was the same as that of the Sun. This revised version was published online in July 2006 with corrections to the Cover Date.     

Polarimetry and Photometry of Comet C/2004 Q2 (Machholz)

We present results of polarimetry and photometry of comet C/2004 Q2 (Machholz) obtained with the 0.7-m telescope of Institute of Astronomy at the Karazin Kharkiv National University on February 3 and 4, and March 4 and 14, 2005. The observations were carried out with a one-channel photoelectric photometer-polarimeter. The IHW continuum UC (λ3650/80 Å), BC (λ4845/65 Å), RC (λ6840/90 Å) and emission filters CN (λ3871/50 Å), C₃ (λ4060/70 Å), and C2 (λ5140/90 Å) were used. Degree of the comet polarization at phase angles ≈ 52° and ≈44° in the red continuum was close to that for so called dusty comets. The comet had a typical spectral gradient of polarization ΔP/Δλ=0.86% per 1000 Å. In the framework of the Haser model we have found the gas production rates Q of the CN, C₃ and C₂ species and the dust production rates Afρ on February 4 and March 14, 2005. The ratio log[Afρ (BC)/Q(CN)] was compared with data for other comets. The normalized spectral gradient of cometary dust S’(BC,RC) was 8.7%/1000 Å for February 4 and 17.0%/1000 Å for March 14. We conclude that comet C/2004 Q2 (Machholz) in many respects is a typical dusty comet.