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Your search keyword '"Niu, Jia-Shu"' showing total 61 results
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61 results on '"Niu, Jia-Shu"'

52. Asteroseismology of the Double-mode High-amplitude δ Scuti Star VX Hydrae

Author

Xue, Hui-Fang, primary, Fu, Jian-Ning, additional, Fox-Machado, L., additional, Shi, Jian-Rong, additional, Zhou, Yu-Tao, additional, Zhang, Jun-Bo, additional, Michel, R., additional, Yan, Hong-Liang, additional, Niu, Jia-Shu, additional, Zong, Wei-Kai, additional, Su, Jie, additional, Castro, A., additional, Ayala-Loera, C., additional, and L., Altamirano-Dévora, additional

Published
2018
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58. NGC 1893: a young open cluster rich in multitype variable stars.

Author

Xue, Hui-Fang, Fu, Jian-Ning, Mowlavi, Nami, Saesen, Sophie, Barblan, Fabio, Yang, Yong, and Niu, Jia-Shu

Subjects
STAR clusters, ASTRONOMICAL photometry, STELLAR oscillations, VARIABLE stars, TELESCOPES
Abstract

In this work, we have studied the variable stars in the young open cluster NGC 1893 based on a multiyear photometric survey covering a sky area around the cluster up to 31 arcmin × 31 arcmin wide. More than 23 000 images in the V band taken from 2008 January to 2017 February with different telescopes, complemented with 90 images in the B band in 2014 and 2017, were reduced, and light curves were derived in V for 5653 stars. By analysing these light curves, we detected 147 variable stars (85 of them being new discoveries), including 110 periodic variables, 15 eclipsing binaries, and 22 non-periodic variables. Proper motions, radial velocities, and colour–magnitude and two-colour diagrams were used to identify the cluster membership of these variable stars, resulting in 84 members. Periodic variable members were then classified into different variability types, mainly according to their magnitudes and to their periods of variability, as well as to their positions in the Hertzsprung–Russell diagram for the early-type stars. As a result, among main-sequence periodic variable members, we identified five β Cep candidates, seven slowly pulsating B-type candidates, and thirteen fast-rotating pulsating B-type (FaRPB) candidates (one of which is a confirmed classical Be star). While most of the FaRPB stars display properties similar to the ones discovered in NGC 3766 by Mowlavi et al. five of them have periods below 0.1 d, contrary to expectations. Additional observations, including spectroscopic, are called for to further characterize these stars. We also find a binary candidate harbouring a δ-Scuti candidate. [ABSTRACT FROM AUTHOR]

Published
2019
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59. Pulsation Analysis of the High Amplitude �� Scuti Star CW Serpentis

Author

Niu, Jia-Shu, Fu, Jian-Ning, and Zong, Wei-Kai

Subjects
FOS: Physical sciences, Solar and Stellar Astrophysics (astro-ph.SR)
Abstract

Time-series photometric observations were made for the High Amplitude $��$ Scuti star CW Ser between 2011 and 2012 at the Xinglong Station of National Astronomical Observatories of China. After the frequency analysis of the light curves, we confirmed the fundamental frequency of $f = 5.28677\ cd^{-1}$, together with 8 harmonics of the fundamental frequency, 7 of which are newly detected. No additional frequencies were detected. The O-C diagram, produced with the 21 newly determined times of maximum light combined with those provided in the literature, helps to obtain a new ephemeris formula of the times of maximum light with the pulsation period of $0.189150355 \pm 0.000000003\ days$., 16 pages, 5 figures

Published
2013
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60. DISCOVERY OF MULTIPLE PULSATIONS IN THE NEWδSCUTI STAR HD 92277: ASTEROSEISMOLOGY FROM DOME A, ANTARCTICA

Author

Zong, Weikai, primary, Fu, Jian-Ning, additional, Niu, Jia-Shu, additional, Charpinet, S., additional, Vauclair, G., additional, Ashley, Michael C. B., additional, Cui, Xiangqun, additional, Feng, Longlong, additional, Gong, Xuefei, additional, Lawrence, Jon S., additional, Luong-Van, Daniel, additional, Liu, Qiang, additional, Pennypacker, Carl R., additional, Wang, Lingzhi, additional, Wang, Lifan, additional, Yuan, Xiangyan, additional, York, Donald G., additional, Zhou, Xu, additional, Zhu, Zhenxi, additional, and Zhu, Zonghong, additional

Published
2015
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