共查询到20条相似文献,搜索用时 796 毫秒
1.
N. N. Samus’ O. V. Durlevich A. V. Zharova E. V. Kazarovets N. N. Kireeva E. N. Pastukhova D. B. Williams M. L. Hazen 《Astronomy Letters》2006,32(4):263-273
We present a new electronic version of the third volume of the fourth edition of the General Catalogue of Variable Stars (GCVS) that contains data on 13 855 variables in the constellations Pavo-Vulpecula. The Name Lists of Variable Stars from no. 67 to no. 77 were included in the new version. The main distinctive feature of the new version is that improved J2000.0 equatorial coordinates (including those for 6163 stars corrected for the proper motions) based on the identifications with positional catalogues using finding charts and on our new measurements are presented for 13 812 stars. We searched for a number of stars on original plates from the plate stacks of several observatories and using images from digital sky surveys. Apart from the complete update of the positional information, we made several corrections that were found to be necessary after the publication of the GCVS Volume III (1985) and several corrections of the information about the variability features based on photometry from currently available automatic sky surveys. A number of problem identifications are described in detail. The new version completes our long-term work on the complete revision of the positional information in the GCVS. In the Conclusions, we give a list of references to new Internet resources. 相似文献
2.
A complement to the the analytical solution given by Damour and Deruelle (D&D) in order to solve the differential equations
that describe the conic-like and rectilinear post-Newtonian two-body problem is presented. We show the geometric relation
between the eccentric and true anomalies for the elliptic-like and hyperbolic-like cases and expressions for their velocities
are obtained. A post-Newtonian version of the Lambert's theorem is shown.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
3.
Renyang Zhao 《Astrophysics and Space Science》2002,280(3):197-208
In the present paper, in terms of the theory about the mechanisms of radio radiation, we have briefly classified, induced,
summarized and reviewed the methods for deriving the magnetic field in the solar (radio) active regions.
This revised version was published online in July 2006 with corrections to the Cover Date.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
5.
N. N. Samus’ V. P. Goranskii O. V. Durlevich A. V. Zharova E. V. Kazarovets E. N. Pastukhova M. L. Hazen T. M. Tsvetkova 《Astronomy Letters》2002,28(3):174-181
We present a new electronic version of the first volume of the General Catalogue of Variable Stars (GCVS), fourth edition, which contains data on 10558 variable stars in Andromeda-Crux (the constellations are ordered in the Catalog according to the Latin alphabet). This version incorporates the name lists of variable stars from no. 67 to no. 76 for the same constellations. The main distinctive feature of the new version is that it provides improved equatorial J2000.0 coordinates for 10349 stars (including those for 4587 stars corrected for proper motions). These are based on identifications with positional catalogs using finding charts and on our new measurements. We searched for a number of stars on original plates from the plate collections of several observatories. The version also includes a file of remarks to the first GCVS volume and a preliminary version of the file of bibliographic references to the entire fourth edition of the GCVS. Apart from a complete update of the positional information, the new version incorporates all the other corrections that were found to be necessary after the first GCVS volume was published (1985). 相似文献
6.
Solar System Research - The inner (or satellite) version of the restricted elliptic three-body problem is considered. The terms up to the fourth order inclusive in small parameter are retained in... 相似文献
7.
A.F. Kholtygin 《Astrophysics and Space Science》1997,255(1-2):513-514
The problem of the ne and Te fluctuations in the planetary nebulae (PN) in a view of the ISO data was investigated. The fluxes
in the OIII fine structure (FS) lines for a large sample of PNe were estimated.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
8.
N. N. Samus’ V. P. Goranskii O. V. Durlevich A. V. Zharova E. V. Kazarovets N. N. Kireeva E. N. Pastukhova D. B. Williams M. L. Hazen 《Astronomy Letters》2003,29(7):468-479
We present a new electronic version of the second volume of the fourth edition of the General Catalogue of Variable Stars (GCVS), which contains data on 13480 variable stars in the constellations Cygnus-Orion (the order of constellations in the Catalogue follows the Latin alphabet). The new version takes into account the Name Lists of Variable Stars from no. 67 to 76 for the same constellations. The main distinctive feature of the new version is that it contains improved equatorial J2000.0 coordinates for 13446 stars (including those for 5052 stars with an allowance made for proper motions), based on the identifications with positional catalogs using finding charts, as well as on our new measurements. We searched for a number of stars on original plates from the collections of several observatories and using digital sky survey images. The new version also includes a file of remarks to the second and third GCVS volumes. Apart from a complete update of the positional information, we took into account several corrections that were found to be necessary after the publication of the second GCVS volume (1985). We present a list of references to new Internet resources. 相似文献
9.
We compared a set of cotemporal magnetograms of active regions obtained with the Michelson Doppler Imager (MDI) aboard SOHO
and the Spectro-Polarimeter (SP) of the Solar Optical Telescope (SOT) on board Hinode. The comparison shows that even with the recent calibration of level-1.8 data, the magnetic flux density derived from the
MDI data is still lower than that obtained with SP. The average ratio between current version 2008 MDI level-1.8 data and
SP magnetograms is 0.71, and is 0.82 for version 2007 MDI level-1.8 data. The comparison also shows that the most recent version
2008 calibration of MDI level-1.8 data has successfully removed the center-to-limb variation, while version 2007 level-1.8
data did not, as estimated by Ulrich et al. (Solar Phys.
255, 53, 2009). 相似文献
10.
In the present paper, inequalities stronger than Sundman's and the best possible zero velocity surfaces of the spatial 3-body problem first obtained by Saari (1987) are deduced using a modified version of the transformation developed by Zare (1976). The notion of inertia ellipsoid is used to show the equivalence of the present authors' result to that of Saari's. 相似文献
11.
Martin Cohen 《Astrophysics and Space Science》1994,217(1-2):181-187
I report further developments of the Wainscoatet al. (1992) (hereafter WCVWS) model of the point source sky. The newest version of this model now predicts cumulative or differential source counts, and integrated surface brightness of the sky due to smeared point sources, in any direction, for any infrared filter with passband within the range 2.0–35.0µm. The realistic representation of the Galaxy (disk, spiral arms and local spur, molecular ring, bulge, halo) and the extragalactic sky has been improved, guided by CO surveys of local molecular clouds. The newest version of the model is very well-validated by IRAS source counts; works well at B and V, even in the plane; and operates successfully in the far-ultraviolet (FUV). Applications discussed are: interpreting the new TMGS near-infrared survey of the plane; confusion in sky surveys; and seeking cosmological background radiation. 相似文献
12.
Since the SSW (Solar Soft Ware) has been developed to the version 2, in comparison with the version 1 the performance of the integration calculation of the Bremsstrahlung radiation caused by high-energy electrons is improved. On the basis of the version 2 of SSW, we have made further improvement on the integration calculation. The comparison between a few schemes of Bremsstrahlung integration shows that our final scheme is faster than the version 2 for 2∼5 times. Compared with the version 1 and version 2 of SSW, the integration accuracy has been also improved a lot, even under the default control accuracy there will be no spikes appearing in photon spectra. In addition, the time consumption of integration is no longer sensitive to the upper limit of the integration. The improvement of the integration performance enables the accurate Bremsstrahlung cross-section be used to calculate the Bremsstrahlung integration. Compared with the result of approximate Bremsstrahlung cross-section, the result of accurate Bremsstrahlung cross-section gives a little smaller photon flux (≤4%), and the integration time increases about 30%. 相似文献
13.
SSW(Solar SoftWare)的能量电子产生X光子的轫致辐射积分计算发展到版本2时,其性能相比初始的版本1提高很多.在版本2的基础上,对这个积分进一步改进.通过对比几种轫致辐射积分方案,结果显示,最终的方案性能上比版本2可以快约2~5倍.在积分的精确性上比版本1及版本2均改进了很多,在缺省的积分控制精度下也不再产生光子谱的尖刺现象.而且,积分耗时不再敏感于积分上限取值.由于积分性能的提高,使得利用精确的轫致辐射截面计算轫致积分成为可能.结果显示,用精确轫致辐射截面比先前的近似截面积分的结果光子流量略小(≤4%),积分时间大约比先前使用近似截面多30%. 相似文献
14.
15.
We have studied the optical historical light curves of two Active Galactic Nuclei (AGNs): OJ287 and 3C345. We find a linear
dependence between the magnitude and the logarithm of the length of the time the objects stay below this magnitude. The relation
may originate from a fractal structure of the light curve.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
16.
Through the photometric observations of NGC7789 with the Schmidt telescopefor four consecutive nights, sixteen variable stars
were discovered. It was found that three are Algol (EA) type, seven are W UMa (EW) orβ Lyrae (EB) type and one is δ Scuti
type.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
17.
Nikolai Zaitsev 《Astrophysics and Space Science》2000,274(1-2):149-156
The effects of the 11 year solar activity cycle on the heliospheric plasma interface in the presence of neutral H-atoms have
been investigated. Our calculations show that nonstationary processes of such kind lead to1) a decrease of the mean interstellar
plasma density in the interface;2) a sequence of shocks and rarefaction waves moving from the heliopause (HP)to the bow shock
(BS); 3) an expansion of the region between the BS and HP;4) the TS excursion along the upwind direction is within 30%of the
mean solar distance.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
18.
Jacques Henrard 《Celestial Mechanics and Dynamical Astronomy》1997,69(1-2):187-198
The effects of the "great inequality" (the quasi-resonance between Jupiter and Saturn) on the motion in the 2/1 mean motion
resonance with Jupiter (the Hecuba gap) is investigated. We confirm the proposition made by Ferraz-Mello and collaborators
that the great inequality generates secondary resonances which are likely to produce the slow diffusion observed in numerical
investigations. We identify, in the restricted three body problem, the frequencies responsible for these secondary resonances.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
19.
J. W. Bond 《Earth, Moon, and Planets》1982,26(3):317-321
By reforming a series of expressions derived by Öpik (1969), we have shown explicitly the dependence of impact crater diameter on projectile kinetic energy. Comparisons between this reformed version of Öpik's theory and the models of Gault (1973) and Oberbeck and Aoyagi (1972) have demonstrated good agreement between experiment and theory over seventeen orders of magnitude of projectile kinetic energy. 相似文献
20.
Wim Brouw 《Astrophysics and Space Science》2001,278(1-2):205-208
The next generation radio telescope being planned is the Square Kilometer Array (SKA): an international project which is currently
in the research and development phase. Australia is one of the partner countries in the SKA consortium; here I describe some
of the SKA research being undertaken in Australia.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献