1984 Vol. 0 No. 1
1984, 0(1): 1-18.
Identification charts and positions with the average accuracy of ±1".0 are presented for 28 classical novae,2 recurrent novae and 14 cataclysmic variables.Field charts for 5 unidentified post-novae are also given.The observations were maken at Beijing Observatory with a 600/900 Schmidt telescope in 1980-1982.
1984, 0(1): 19-22.
A new method is proposed to replace the common level tube measuring method which is effected by many factors.By means of this new method one can mensure the true level error of the liorizontal axis,wliich can be turned at 180°when observation are carried out,using the mereary plane as the datum plane and the autocollimation mode.The attainalilc accuracy of measurement is also estimated.
1984, 0(1): 23-32.
After the test observations made in 1982,we improved the operating conditions of the instrument to increase in the accaracy and reliability of time records.The new instrument constant £ was obsolutely determined in 1983,the accuracy determined every time was ±0s.0095 and we used the values of ε actually measured to calculate the absolute azimuth of the instrument with the accuracy determined every time being ±0s.0125 and increasing by a factor of 2 as compared with 1982.
1984, 0(1): 33-37.
A ZEISS Transit is refitted to be flexibly suited to observe stars alternately in the meridian and prime vertical directions.The tested results show that the refitment is a success and the expectant requirements are fulfilled.Tests for automatically controlling the instrument are taken.The imoundness of the telescopic pivot is also tested and measured.
1984, 0(1): 38-42.
In this article we propose a method of determining changes in the line of sight of the telescope caused by the factors,such as the flexure of the tube,the gravitational displacement of the main mirror,etc.,by utilizing an advantageous condition that the horizontal axis of a low-latitude meridian circle be turned at 180°in the course of observations.It is helpful to use this method to improve the accuracy of determing right ascensions.
1984, 0(1): 43-54.
Statistical analyses of the data of the radio bursts with seven frequencies,x-rays and the sudden short wave fade-out(SSWF) from January 1980 to October 1982 are carried out,and the warning effects have been checked by means of the data of the radio bursts with three radio frequencies of 2902 MHz,3653 MHz and 9375 MHz obtained at Yunnan Observatory from January 1980 to August 1982.Thus it is possible to warn the sudden short wave fade-out using the peak flux density of radio hursts with these three frequencies.
1984, 0(1): 55-60.
Twelve slowly varying sources producing proton events observed at Yunnan Observatory from 1980 to 1982 are analysed.According to the observations made with three radio telescopes with the working frequencies of 9375 MHz,3653 MHz and 2902 MHz,respectively,some characteristics of the sources are given.The effect of the changes in the solar radiation flux of slowly varying sources on the production of proton events is preliminarily discussed.
1984, 0(1): 61-72.
We report on the correction of the atmospheric refraction made daring the radio obrervation of the solar eclipse on Feb.16,1980.The reckoning formulas,calculating method,computed results and the real time correction in the course of the observation are described in the present article.
1984, 0(1): 73-78.
The design ideas,structure and characteristics of the photometer attached to the 100-cm telescope arc described in this paper.The instrument is a DC integrated photoelectric photometer system.The integrating function and the integration time can be chosen freely.There is a microcomputer with a set of excellent software,which can be used to make real time collections and data reduction and observations.There are two colour systems in the photometer,Johnson's UBV system and Stromgren uvby system,in which an EMI 6256B photomultiplier tube is used.
1984, 0(1): 79-84.
The test results of ths principal penrormancc of some parts of an integrated photometer are introduced in this paper.The spectral response curves of the photometer head are given,When the diaphragm is 32",its plateau range is 23".The zero drifts of two DC amplifiers arc less than 0.5 mv/hour and their linearities are better than 0.003.The voltaec stability of the high voltage power supply equals or is less than 0.0002.
1984, 0(1): 85-92.
An integrated photoelectric photometer has been fixed on the 1-m telescope and the test observation has been made.Among the contents of the test obser-vation,there are the analysis of the stability of the photometer,the determination of the observation accuracy,the extinction and transformation coefficients.Also,a few eclipsing binaries are observed.
1984, 0(1): 93-97.
The optimutTily usable width of the slit of the Coude spectrograph attached to the 1-m telescope at Yunnan Observatory is discussed according to the observations obtained.The selection of the major and minor collimators is also discussed.These discussions may be helpful to those who would like to use the instrument.
1984, 0(1): 98-110.
In consideration of the site selection of a satellite ground receiving station,a set of rules of allowable electromagnetic interference(EMI) levels is proposed in this paper.The methods for analysing calculating and measuring EMI are described,and the requirements which the measuring system should fulfil are also suggested.Moreover,as far as some kinds of spectrographs and common EMI sources are concerned,the data-processing methods are mentioned in detail.These considerations can also be consulted by various artificial satellite ground stations and other microwave receiving stations.
1984, 0(1): 111-118.
The isotropic coordinate System is used to further discuss "a theory of gravitation by considering the vector graviton field and the metric field"(VGM).The following results are obtained.(1) The "infinite redshift surface" of which the radius r is finite does not exist;(2) The reason is given why the result derived from the VGM theory is different from that derived from the general relativity with respect to the perihelion motion of a planet;(3) The Kepler's third law is modified and the modified result can be regarded as a prediction of the VGM theory.