Showing papers in "Chinese Astronomy and Astrophysics in 1987"

TL;DR: In this article, the effects of microscopic electric field, Doppler broadening and radiation damping in the solar atmosphere magnetic field were considered and the perturbation theory of quantum mechanics was used to determine the broadening mechanisms and the absorption coefficient of the Hβ line.

TL;DR: In this article, the relation between the 2 keV monochromatic X-ray luminosity 1X and ∼2500A ultraviolet luminosity is calculated and the result is: 1x √ 10bp, b = 0.93 ± 0.18 when the accretion rate ⪡ cr, and b =0.28 ± 0.18 when > cr.

TL;DR: In this article, a statistical method was proposed to estimate the true rotational velocity V of a be star from its observed apparent apparent velocity U = V sin i, and it was shown that be stars do not rotate with the critical velocity.

TL;DR: In this article, a non-LTE calculation of the simultaneous solution of equations of radiative transfer and statistical equilibrium for hydrogen and calcium was carried out based on calculated results of a series of flare models, and the effect of the Call K line by mircoturbulence, the temperature minimum region and the transition region.

TL;DR: In this paper, the coordinates, B j ∗ magnitudes and identification of charts for 121 QSO candidates of reliability Q ⩾ 4 found in the southeastern quarter of the UK Schmidt Sky Region 823 centered at 00h00m + 00°00'.

TL;DR: In this article, a numerical model of the coronal transients is presented, based on the ideal MMD equations, taking into account the interaction between the magnetic field and the corona plasma.

TL;DR: The hard X-ray phoswich telescope, HAPI-1, was designed for making observations on board high-flying balloons as discussed by the authors, and it was used to observe the Crab pulsar in the energy range 20 to 200 keV.

TL;DR: In this paper, a large amount of photoelectric observation in the V-band on AD CMi was carried out, and it was inferred that this star has been pulsating for at least 8.6 million years.

TL;DR: In this paper, the Hα regions of 31 RS CVn stars made with Reticon on the 2.1 metre McDonald Reflector in 1984 were reported, and a statistical discussion was presented on the combined data.

TL;DR: In this paper, the radiative spectrum of the dust heated by Population III (very massive objects before the formation of galaxies), for the two cases of no Lyman cutoff and with Lyman filter, is discussed.

TL;DR: In this article, the authors used the magnetic monopole catalytic reaction of nuclear decay (the Rubakov-Callan effect) as energy source to build a non-black hole model of giant dense galactic nuclei containing monopoles below the Parker limit.

TL;DR: Spectrographe monte sur le telescope de 1 m de l'observatoire de Yunnan, du 21 au 25 mars 1986 as mentioned in this paper, et al., et al.

TL;DR: In this article, a new investigation of the secular drift of the Earth's pole was made based on nine long series of latitude observations, which led to the following conclusions: 1) During this century, the Earth pole has been moving approximately along meridian 70 °W at a mean rate of 0.0016″/yr, much less than the 0.0 of the ILS sequence, and therefore, the Conventional International Origin (CIO, defined by the mean latitudes at 1903.

TL;DR: In this article, a method of simplifying the evaluation of the Poisson integral in the spiral density wave theory was proposed, which will save computer time in the kernal function by a factor of 84.

TL;DR: In this article, the data of trignometric parallaxes determined along α and δ published by the US Naval Observatory and Van Vleck Observatory were discussed and the absolute difference δπ = π x − π y showed a very similar periodic variation with α for both observations.

TL;DR: In this paper, the Berger polarimeter of McDonald Observatory was used for the first time to measure the optical linear polarization of RS CVn systems, which averaged about 0.20% and showed time variations by factors between 10 and 30.

TL;DR: In this paper, a serial combination of Vondrak filter was used to construct a multi-stage filter of the form tW = C [I − V N ] M to effect a narrow-band filtering of time series.

TL;DR: In this paper, the spectral lines Hα Hβ and CaII K of a quiescent prominence were studied using the completely linearized model and the physical parameters (T e, v t, N H ) at several locations were obtained.

TL;DR: In this article, the Wilson-Devinney method was used to obtain two-colour photoelectric photometry of V541 Cas made in 1982 Sept-Dec. The results showed the system to be a detached binary, with a mass ratio 2.083, and the less massive component filling its Roche lobe more closely.

TL;DR: In this paper, the authors presented the result of UBV photoelectric photometry of VV Cephei and determined the contact times from the B-V and U-B curves.

TL;DR: In this paper, the authors applied a fuzzy set analysis on 400 sample solar active regions of 1980, each containing the following data: sunspot type, total spot area, magnetic field type, maximum field intensity, peculiar structures, radio flux at 3 cm, and radio flux ratio between 3 cm and 10 cm.

TL;DR: By means of two-point correlation function, clustering analysis (precolation method) and multiplicity funciton, this article analyzed the clustering of quasars for two samples of quasar candidates, and found that there is no obvious difference between the results of the observed and Monte-Carlo samples, apart from a weak clustering on the scale of 100 Mpc in the former.

TL;DR: In this article, a Cerenkov radio line emission mechanism was proposed to interpret the nonthermal emission lines of molecular clouds by using the theory of celestial masers, where relativistic electrons passing through a cloud with population inversion can generate microwave emission lines with anomalous intensity ratios.

TL;DR: In this paper, the authors discuss the thermodynamics of white holes and give their thermodynamic laws and point out that there is a flaw in the view that white holes must necessarily violate the Second Law of Thermodynamics.

TL;DR: In this article, the authors measured the evolution of 300 network features from a time sequence of magnetograms of a quiet region of 1983 October 14, and found that the contribution to flux decrease by Type 3 is 1.28 times that by Type 1, and the contribution of flux increase by Type 4 is 7 times more than by Type 2. The magnetograms have a spatial resolution of 2 to 3 arcsec and a time resolution of about 2 hr.

TL;DR: In this paper, the results of J, H, K photometry on 41 RS CVN systems and the data on 40 RS CVn systems identified with IRAS point sources were given.

TL;DR: In this paper, the authors report that during their photoelectric photometric narrowband monitoring of Comet Halley during 1986 Mar 20 - Apr 3, they witnessed a considerable explosion on the comet.

TL;DR: In this paper, the spectrum of dust heated by accretion disks of SMOs and the effect of the re-radiation on the cosmic mu-wave background were discussed and the main results were: (1) whether or not there is Lyman-α cutoff, the dust radiation in the case of SMO is very strong and will appreciatively distort the muwave background.

TL;DR: In this paper, the authors used brightness distribution of compact radio sources to calculate the delay and fringe rate produced by source structure, and used MK III VLBL data for calculating the effect of source structure on the precision of baseline measurement.