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天文和天体物理学研究
天文和天体物理学研究

汪景琇 景益鹏

月刊

1674-4527

wenyy@bao.ac.cn

010-64853746

100717

北京朝阳区大屯路甲20号国家天文台 RAA编辑部

天文和天体物理学研究/Journal Research in Astronomy and AstrophysicsCSCD北大核心CSTPCDSCI
查看更多>>本刊1981年创刊至2000年已出版20卷。创刊时为中文期刊，2001年改为《中国天文和天体物理学报》（英文版）。主要刊登天文学和天体物理学领域的原创性研究论文。主要栏目和报道范围：“研究快报”用来报道天文观测的新结果及新理论；“特约综述”聘请国际知名天文学家就某些热点问题进行专题评述。“研究论文”具有原创性。2009年更名为《天文和天体物理学研究》（英文版），由双月刊变为月刊。
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    A Rendezvous Mission to the Second Earth Trojan Asteroid 2020 XL5 with Low-Thrust Multi-Gravity Assist Techniques

    Shi-Hai YangBo XuXin Li
    245-264页
    查看更多>>摘要：As the second of Earth's Trojan asteroids,2020 XL5 is worthy of rendezvous and even sample return missions in many aspects.In this paper,a rendezvous mission to Earth's second Trojan asteroid 2020 XL5 is proposed.However,due to its high inclination and large eccentricity,direct impulsive transfer requires large amounts of fuel consumption.To address this challenge,we explore the benefits of electric propulsion and multi-gravity assist techniques for interplanetary missions.These two techniques are integrated in this mission design.The design of a low-thrust gravity-assist(LTGA)trajectory in multi-body dynamics is thoroughly investigated,which is a complex process.A comprehensive framework including three steps is presented here for optimization of LTGA trajectories in multi-body dynamics.The rendezvous mission to 2020 XL5 is designed with this three-step approach.The most effective transfer sequence among the outcomes involves Earth-Venus-Earth-Venus-2020 XL5.Numerical results indicate that the combination of electric propulsion and multi-gravity assists can greatly reduce the fuel consumption,with fuel consumption of 9.03％,making it a highly favorable choice for this rendezvous mission.
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    The RFI Fast Mitigation Algorithm Based on Block LMS Filter

    Han WuHai-Long ZhangYa-Zhou ZhangJie Wang...
    265-272页
    查看更多>>摘要：The radio telescope possesses high sensitivity and strong signal collection capabilities.While receiving celestial radiation signals,it also captures Radio Frequency Interferences(RFIs)introduced by human activities.RFI,as signals originating from sources other than the astronomical targets,significantly impacts the quality of astronomical data.This paper presents an RFI fast mitigation algorithm based on block Least Mean Square(LMS)algorithm.It enhances the traditional adaptive LMS filter by grouping L adjacent time-sampled points into one block and applying the same filter coefficients for filtering within each block.This transformation reduces multiplication calculations and enhances algorithm efficiency by leveraging the time-domain convolution theorem.The algorithm is tested using baseband data from the Parkes 64 m radio telescope's pulsar observations and simulated data.The results confirm the algorithm's effectiveness,as the pulsar profile after RFI mitigation closely matches the original pulsar profile.
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    • 维普

    Periodic Variation Studies of the Two Short Period W UMa-type Eclipsing Binaries:LX Lyn and V0853 Aur

    Xu ZhangBin Zhang
    273-284页
    查看更多>>摘要：In this paper,new light curves(LCs)of contact eclipsing binary(CEB)systems LX Lyn and V0853 Aur are presented and analyzed by using the 2015 version of the Wilson-Devinney(W-D)code.In order to explain their asymmetric LCs,cool starspots on the components were employed.It is suggested that their fill-out degrees are f=12.0％(LX Lyn)andf=26.3％(V0853 Aur).At the same time,we found that LX Lyn is a W-type eclipsing binary(EB)with an orbital inclination of i=84°.88 and a mass ratio of q—2.31.V0853 Aur is also a W-type CEB with a mass ratio of q=2.77 and an orbital inclination of i=79°.26.Based on all available times of light minimum,their orbital period changes are studied by using the O-C method.The O-C diagram of LX Lyn reveals a cyclic oscillation with a period of about 14.84 yr and an amplitude of 0.0019 days,which can be explained by the light-travel time effect(LTTE)due to the presence of a third body with a minimum mass of 0.06M⊙.For V0853 Aur,it is discovered that the O-C diagram of the system also shows a cyclic oscillation with a period of 9.64 yr and an amplitude of 0.03365 days.The cyclic oscillation of V0853 Aur can be attributed to the LTTE by means of a third body with a mass no less than 3.77M⊙.The third body may play an important role in the formation and evolution of these systems.
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    A Possible γ-Ray Pulsation from PSR J1740-5340B in the Globular Cluster NGC 6397

    Jiao ZhengPengfei ZhangLi Zhang
    285-291页
    查看更多>>摘要：Recently,a new radio millisecond pulsar(MSP)J1740-5340B,hosted in the globular cluster(GC)NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period.Based on a modified radio ephemeris updated by tool tempo2,we analyze the～15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of～4σ with a weighted H-test value of～26.By performing a phase-resolved analysis,the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is Lγ～3.8 ×1033ergs-1 using NGC 6397's distance of 2.48 kpc.And γ-rays from the on-pulse part of PSR J1740-5340B contribute～90％of the total observed 7-ray emissions from NGC 6397.No significant 7-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs,more data in γ-ray,X-ray,and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B,especially starving for a precise ephemeris.
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    • 维普

    HI in High Gas-phase Metallicity Dwarf Galaxy WISEA J230615.06+143927.9

    Yan GuoC.SenguptaT.C.ScottP.Lagos...
    292-299页
    查看更多>>摘要：We present resolved Giant Metrewave Radio Telescope HI observations of the high gas-phase metallicity dwarf galaxy WISEA J230615.06+143927.9(z=0.005)(hereafter J2306)and investigate whether it could be a Tidal Dwarf Galaxy(TDG)candidate.TDGs are observed to have higher metallicities than normal dwarfs.J2306 has an unusual combination of a blue g-r color of 0.23 mag,irregular optical morphology and high-metallicity(12+log(O/H)=8.68±0.14),making it an interesting galaxy to study in more detail.We find J2306 to be an HI rich galaxy with a large extended,unperturbed rotating HI disk.Using our HI data we estimated its dynamical mass and found the galaxy to be dark matter(DM)dominated within its HI radius.The quantity of DM,inferred from its dynamical mass,appears to rule out J2306 as an evolved TDG.A wide area environment search reveals J2306 to be isolated from any larger galaxies which could have been the source of its high gas metallicity.Additionally,the HI morphology and kinematics of the galaxy show no indication of a recent merger to explain the high-metallicity.Further detailed optical spectroscopic observations of J2306 might provide an answer to how a seemingly ordinary irregular dwarf galaxy achieved such a high level of metal enrichment.
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    • 维普

    PSRDP:A Parallel Processing Method for Pulsar Baseband Data

    Ya-Zhou ZhangHai-Long ZhangJie WangXin-Chen Ye...
    300-310页
    查看更多>>摘要：To address the problem of real-time processing of ultra-wide bandwidth pulsar baseband data,we designed and implemented a pulsar baseband data processing algorithm(PSRDP)based on GPU parallel computing technology.PSRDP can perform operations such as baseband data unpacking,channel separation,coherent dedispersion,Stokes detection,phase and folding period prediction,and folding integration in GPU clusters.We tested the algorithm using the J0437-4715 pulsar baseband data generated by the CASPSR and Medusa backends of the Parkes,and the J0332+5434 pulsar baseband data generated by the self-developed backend of the NanShan Radio Telescope.We obtained the pulse profiles of each baseband data.Through experimental analysis,we have found that the pulse profiles generated by the PSRDP algorithm in this paper are essentially consistent with the processing results of Digital Signal Processing Software for Pulsar Astronomy(DSPSR),which verified the effectiveness of the PSRDP algorithm.Furthermore,using the same baseband data,we compared the processing speed of PSRDP with DSPSR,and the results showed that PSRDP was not slower than DSPSR in terms of speed.The theoretical and technical experience gained from the PSRDP algorithm research in this article lays a technical foundation for the real-time processing of QTT(Qi Tai radio Telescope)ultra-wide bandwidth pulsar baseband data.
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    • 维普

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