Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Dengkai Jiang"'
Autor:
Zhenwei Li, Yangyang Zhang, Hailiang Chen, Hongwei Ge, Dengkai Jiang, Jiangdan Li, Xuefei Chen, Zhanwen Han
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 22 (2024)
The hot subdwarf O/B stars (sdO/Bs) are known as extreme horizontal branch stars, which is of great importance in stellar evolution theory. The sdO/Bs are generally thought to have a helium-burning core and a thin hydrogen envelope ( M _env < 0.02 M
Externí odkaz:
https://doaj.org/article/bd8d833b21a94b58b816069331824033
Autor:
Chengyuan Li, Xin Ji, Long Wang, Yue Wang, Baitian Tang, Antonino P. Milone, Yujiao Yang, Holger Baumgardt, Dengkai Jiang
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 8 (2023)
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters. The
Externí odkaz:
https://doaj.org/article/fb61b6b8693f42489fa3c83847f508d6
Autor:
Hongwei Ge, Christopher A. Tout, Xuefei Chen, Matthias U. Kruckow, Hailiang Chen, Dengkai Jiang, Zhenwei Li, Zhengwei Liu, Zhanwen Han
Common envelope evolution (CEE) physics plays a fundamental role in the formation of binary systems, such as mergering stellar gravitational wave sources, pulsar binaries and type Ia supernovae. A precisely constrained CEE has become more important i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5af39a636aaf6651587c07789b59a962
Autor:
Dengkai Jiang
Publikováno v:
The Astrophysical Journal. 940:97
Blue stragglers (BSs) in different regions (e.g., two sequences) of the colorâmagnitude diagram (CMD) have been suggested to provide a strong constraint on the origin of BSs in globular clusters (GCs). However, our understanding of the locations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d859faa6e740dfbdd12b5dfed402e135
https://doi.org/10.3847/1538-4357/ac9a42
https://doi.org/10.3847/1538-4357/ac9a42
Publikováno v:
New Astronomy. 66:14-19
New complete BVR light curves of the contact binary AR Bootis (AR Boo) are presented. They are analyzed through the 2013 version of the Wilson–Devinney (W–D) code. Our new photometric solution shows that AR Boo is a W-subtype W UMa contact binary
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7756fdde9d9519f94c7fb674f52e3311
https://doi.org/10.1016/j.newast.2018.07.004
https://doi.org/10.1016/j.newast.2018.07.004
Publikováno v:
The Astrophysical Journal. 935:142
We hereby report a low-speed (about~21~km$\cdot$~s$^{-1}$ with respect to the Sun) intruder member in the Hyades cluster based on the data in the literature. The results show that the star is a non-native member star for the Hyades, with its radial v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::600313a66d8a2cc5e8f0abbc4844ee7c
https://doi.org/10.3847/1538-4357/ac8355
https://doi.org/10.3847/1538-4357/ac8355
The red giant branch (RGB) of globular clusters (GCs) is home to some exotic stars, which may provide clues on the formation of multiple stellar populations in GCs. It is well known that binary interactions are responsible for many exotic stars. Thus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c93a1c59e4af4111170810a0d7770752
http://arxiv.org/abs/2105.00291
http://arxiv.org/abs/2105.00291
Autor:
Xuefei Chen, Thomas Kupfer, S. M. Jia, Jiao Li, Yan Gao, Ulrich Heber, Zhanwen Han, Chao Liu, Dengkai Jiang
Several dozen hypervelocity star (HVS) candidates have been reported based on the second data release of Gaia (Gaia DR2). However, it has been proven that the radial velocities of some Gaia HVS candidates are not reliable. In this paper, we employ re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::facda937044efa5324a2e4b70c94f105
http://arxiv.org/abs/2004.14587
http://arxiv.org/abs/2004.14587
Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters
While it is well known that mass transfer in binaries can pollute the surfaces of the accretors, it is still unclear whether this mechanism can reproduce the observed chemical inhomogeneities in globular clusters. We study the surface abundances of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9d3bc6f920ca6f946f85ac1bdc7d0317
Autor:
Dengkai Jiang
Close detached binaries were theoretically predicted to evolve into contact by three subtypes of case A binary evolution: case AD, AR, and AS, which correspond to the formation of contact during dynamic-, thermal-, and nuclear-timescale mass transfer
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a548331ab530ade5cc167394fb16019
http://arxiv.org/abs/1912.11561
http://arxiv.org/abs/1912.11561