Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Di-Fu Guo"'
Publikováno v:
Odessa Astronomical Publications, Vol 29, Iss 0, Pp 95-97 (2016)
We present the historical light curve of NGC 4151 for 1906–2016. The light curve (Oknyanskij and Lyuty, 2007) is primarily based on our published photoelectric data (1968–2007, about 1040 nightly mean measurements (Oknyanskij and Lyuty, 2007)) an
Externí odkaz:
https://doaj.org/article/e3a878f778dc40d39a7829af8e346620
Autor:
V. L. Oknyansky, N. V. Metlova, O. G. Taranova, V. I. Shenavrin, B. P. Artamonov, C. M. Gaskell, Di-Fu Guo Guo
Publikováno v:
Odessa Astronomical Publications, Vol 27, Iss 1, Pp 47-49 (2014)
We investigate the correlation between infrared (JHKL) and optical (B) fluxes of the variable nucleus of the Seyfert galaxy NGC 4151 using partially published data for the last 6 years (2008-2013). Here we are using the same data as in Oknyansky et a
Externí odkaz:
https://doaj.org/article/4b0ffbd7ee7b4937ac91bab02614005e
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 521:51-59
In this paper, the total eclipsing binary WISE J185503.7+592234 (hereinafter J185503), whose mass ratio is around the mass ratio limit, was observed and investigated for the first time. The stellar atmospheric parameters of the primary (more massive)
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bf80110a221ced2223220f67b066b333
https://doi.org/10.1093/mnras/stad417
https://doi.org/10.1093/mnras/stad417
Autor:
Di-Fu Guo, Kai Li, Fen Liu, Huai-Zhen Li, Qi-Qi Xia, Xing Gao, Xiang Gao, Xu Chen, Dong-Yang Gao, Guo-You Sun
Photometric observations for the totally eclipsing binary system TYC 4002-2628-1, were obtained between November 2020 and November 2021. To determine the stellar atmospheric parameters, a spectral image was taken with the 2.16 m telescope at National
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f9f0fe4ef072ee1b2252c4b4cc7c729
http://arxiv.org/abs/2209.15175
http://arxiv.org/abs/2209.15175
Autor:
Kai Li, Dong-Yang Gao, Fen Liu, Zhi-Jian Xu, Guo-You Sun, Xing Gao, Chang-Ming Zhang, Di-Fu Guo
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 497:3381-3392
By analysing the data observed by the Comet Search Programme telescope at Xingming Observatory from 2018 October 11 to 2018 December 19, 24 eclipsing binaries were identified. By cross-matching with the VSX (AAVSO) website, we found that four binarie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9de90855b18f073b053fa99ebd40716
https://doi.org/10.1093/mnras/staa2170
https://doi.org/10.1093/mnras/staa2170
Autor:
Dong-Yang Gao, Min-Ji Jeong, Qi-Qi Xia, Di-Fu Guo, Chun-Hwey Kim, Kai Li, Shaoming Hu, Xu Chen
The cut-off mass ratio is under debate for contact binaries. In this paper, we present the investigation of two contact binaries with mass ratios close to the low mass ratio limit. It is found that the mass ratios of VSX J082700.8+462850 (hereafter J
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::437432abafb24edd88fea1327d2d18bc
http://arxiv.org/abs/2109.02923
http://arxiv.org/abs/2109.02923
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 485:4588-4600
The period distribution of contact binaries exhibits a very sharp short period cut-off at 0.22 days. In order to provide valuable information on this short period limit, we observed ten totally eclipsing contact binaries with orbital periods near thi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ba3fd2a09c40055e519c512beb9867b6
https://doi.org/10.1093/mnras/stz715
https://doi.org/10.1093/mnras/stz715
Autor:
Shaoming Hu, Ya-Ni Guo, Xing Gao, Dong-Yang Gao, Qi-Qi Xia, Xu Chen, Di-Fu Guo, Chun-Hwey Kim, Kai Li
High precision CCD observations of six totally eclipsing contact binaries were presented and analyzed. It is found that only one target is an A-type contact binary (V429 Cam), while the others are W-type contact ones. By analyzing the times of light
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ca3901c392204ff2de2ead9398fef0ad
http://arxiv.org/abs/2104.13759
http://arxiv.org/abs/2104.13759
Autor:
Huai-Zhen Li, Long-Hua Qin, Quan-Gui Gao, Ting-Feng Yi, Yun-Lu Gong, Di-Fu Guo, Yun-Guo Jiang, Fang-Wu Lu, Ju Ma, Ji-Yang Ren, Ya-Li Liu
Publikováno v:
Publications of the Astronomical Society of the Pacific. 134:044101
We have systemically studied the properties of 1ES 1959+650, specifically its multiband variability and emission mechanisms. We carefully analyze multiband variability properties by four different kinds of trusted approaches. In contrast with previou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fc48cc493a59bf975c53fc229da02009
https://doi.org/10.1088/1538-3873/ac5d21
https://doi.org/10.1088/1538-3873/ac5d21
Autor:
Yuan Liu, Qi-Qi Xia, Di-Fu Guo, Yu Zhang, Xu Chen, Jinzhong Liu, Xing Gao, Kai Li, Shaoming Hu
By analyzing two sets of complete $BVR_cI_c$ light curves of V342 UMa and three sets of complete $BVR_cI_c$ light curves of V509 Cam, we determined that the two systems are both W-subtype contact binaries and that V342 UMa shows a shallow contact con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f73668c7c16dd2ecdc2fdc91130ac83b