Search Publications
A New Statistical Distance Scale for Planetary Nebulae, Based on Gaia EDR3
Ali, A.; Mindil, A.; Alghamdi, S. A. +1 more
The present work aims to build a new statistical distance scale for planetary nebulae (PNe) based on a rigorous calibration sample. The distances of the calibration sample are derived from the trigonometric parallax method using the recent measurements of Gaia Early Data Release 3 (Gaia EDR3). The new distance scale is created by applying the well…
A Study on White Dwarf Masses in Cataclysmic Variables Based on XMM-Newton and Suzaku Observations
Li, Xiang-Dong; Xu, Xiao-Jie; Yu, Zhuo-Li
The distribution of the mass of white dwarfs (WDs) is one of the fundamental questions in the field of cataclysmic variables (CVs). In this work, we make a systematical investigation on the WD masses in two subclass of CVs: intermediate polars (IPs) and non-magnetic CVs in the solar vicinity based on the flux ratios of Fe XXVI-Lyα to Fe XXV-Heα em…
Mapping of Compositional Diversity and Chronological Ages of Lunar Farside Multiring Mare Moscoviense Basin: Implications to the Middle Imbrian Mare Basalts
Sharma, Manish; Karthi, A.; Arivazhagan, S.
The Mare Moscoviense is an astonishing rare flatland multi-ring basin and one of the recognizable mare regions on the Moon's farside. The mineralogical, chronological, topographical and morphological studies of the maria surface of the Moon provide a primary understanding of the origin and evolution of the mare provinces. In this study, the Chandr…
Effects of Binaries on Open Cluster Age Determination in Bayesian Inference
Chen, Jing; Zhang, Su; Li, Zhong-Mu +2 more
We investigate the effects of binaries on the cluster age determination for 561 open clusters in the Galactic disk via the Bayesian statistical framework. Stellar properties of these star clusters, including age, metallicity, distance modulus, color excess, binary fraction, and rotating star fraction, are derived from color-magnitude-diagrams (CMD…
The Origin of The Soft X-Ray Excess in the Seyfert 1.5 Galaxy ESO 362-G18
Zhong, Xiao-Gu; Wang, Jian-Cheng
We review the Seyfert 1.5 Galaxy ESO 362-G18 for exploring the origin of the soft X-ray excess. The Warm Corona and Relativistic Reflection models are two main scenarios to interpret the soft X-ray excess in active galactic nuclei at present. We use the simultaneous X-ray observation data of XMM-Newton and NuSTAR on 2016 September 24 to perform sp…
Evaluating Helium Variations By Modeling Red Giant Branch Bump of Large Magellanic Cluster NGC 1978
Li, Cheng-Yuan; Ji, Xin; Deng, Li-Cai
Many evidences show that the Multiple Population (MP) features exist not only in old clusters but also in intermediate-age clusters in the Megallanic Clouds (MCs), which are characterized by star-to-star abundance scatter of several elements, including helium (He). The red giant branch bump (RGBB)'s photometric properties are proved to be related …
Constraining Mass of M31 Combing Kinematics of Stars, Planetary Nebulae and Globular clusters
Fan, Zhou; Zhu, Ling; Liu, Cheng +2 more
We construct a multiple-population discrete axisymmetric Jeans model for the Andromeda (M31) galaxy, considering three populations of kinematic tracers: 48 supergiants and 721 planetary nebulae (PNe) in the bulge and disk regions, 554 globular clusters extending to ~30 kpc, and halo stars extending to ~150 kpc of the galaxy. The three populations …
Strong Spatial Aggregation of Martian Surface Temperature Shaped by Spatial and Seasonal Variations in Meteorological and Environmental Factors
Li, Fei; Barriot, Jean-Pierre; Luo, Yao-Wen +1 more
Spatio-temporal variation in the Martian surface temperature (MST) is an indicator of ground level thermal processes and hence a building block for climate models. However, the distribution of MST exhibits different levels of spatial aggregation or heterogeneity, and varies in space and time. Furthermore, the effect of regional differences in mete…
Molecular Clouds Associated with H II Regions and Candidates within l = 106.°65 to 109.°50 and b = -1.°85 to 0.°95
Zheng, Yu-Qing; Wang, Hong-Chi; Ma, Yue-Hui +3 more
We present a large-scale simultaneous survey of the CO isotopologues (12CO, 13CO, and C18O) J = 1-0 line emission toward the Galactic plane region of l = 106.°65 to 109.°50 and b = -1.°85 to 0.°95 using the Purple Mountain Observatory 13.7 m millimeter-wavelength telescope. Except for the molecular gas in the solar…
The First Photometric Study of AH Mic Contact Binary System
Poro, Atila; Blackford, M. G.; Ranjbar Salehian, S. +7 more
The first multi-color light curve analysis of the AH Mic binary system is presented. This system has very few past observations from the southern hemisphere. We extracted the minima times from the light curves based on the Markov Chain Monte Carlo (MCMC) approach and obtained a new ephemeris. To provide modern photometric light curve solutions, we…