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A New Statistical Distance Scale for Planetary Nebulae,Based on Gaia EDR3

Research in Astronomy and Astrophysics 2022年第8期22卷 170-181页

作者： A.Ali E.Algarni A.Mindil S.A Alghamdi Astronomy Space Science&Meteorology DepartmentFaculty of ScienceCairo UniversityGiza 12613Egypt Astronomy and Space Science Department Faculty of ScienceKing Abdulaziz UniversityJeddahSaudi Arabia Department of Physics College of ScienceUniversity of JeddahJeddahSaudi Arabia

The present work aims to build a new statistical distance scale for planetary nebulae(PNe)based on a rigorous calibration *** 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-known linear relationship between the radio surface brightness temperature and the nebular *** calibration sample is made up of 96 PNe of accurately computed distances with uncertainties less than20%.Earlier ground-and space-based trigonometric parallaxes of PNe display inconsistency with those of Gaia,particularly the Hipparcos *** addition,these measurements have appreciably lower precision than those of *** compared to the trigonometric technique,the expansion and kinematic methods exhibited more consistency than the spectroscopic,extinction,gravity,and photoionization ***,contrary to earlier results in the literature,the extinction and gravity methods,on average,underestimate and slightly overestimate the PN distances *** a byproduct of extracting the Gaia parallaxes,we detect the radial velocity and variability for 14 and 3 PN central stars(CSs),*** our knowledge,the variability of Hen 2-447 CS has been determined for the first time.

关键词： (ISM:)planetary nebulae:general parallaxes stars:variables:general stars:distances

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A Photometric Study of Two Contact Binaries: CRTS J025408.1+265957 and CRTS J012111.1+272933

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Research in Astronomy and Astrophysics 2022年第9期22卷 223-238页

作者： Shuo Ma Jin-Zhong Liu Yu Zhang Qingshun Hu Guo-Liang Lü Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and Technology Xinjiang UniversityUrumqi 830064China

We performed new photometric observations for two contact binaries(i.e., CRTS J025408.1+265957 and CRTS J012111.1+272933), which were observed by the 1.0 m telescope at Xingjiang Astronomical Observatory. From our light curves and several survey data, we derived several sets of photometric solutions. We found that CRTS J025408.1+265957 and CRTS J012111.1+272933 were A-and W-type W UMa, respectively. The results imply that the spot migrates or disappears in the two contact binaries, which were identified by chromospheric activity emissions(e.g., Hαemission) from LAMOST spectra. From the O-C curves, the orbital periods of the two contact binaries may be increasing, which is interpreted by the mass transfer from the less massive component to the more massive one. With mass transferring, the two contact binaries may evolve from the contact configurations to semi-detached ones as predicted by the theory of thermal relaxation oscillation.

关键词： stars:binaries:eclipsing (stars:)binaries:spectroscopic stars:fundamental parameters stars:distances stars:individual(CRTS J025408.1+265957 CRTS J012111.1+272933)

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