Zobrazeno 1 - 10
of 34
pro vyhledávání: '"P C Beers"'
Autor:
Xiao-Jin Xie, Jianrong Shi, Hong-Liang Yan, Tian-Yi Chen, Carlos Allende Prieto, Timothy C. Beers, Shuai Liu, Chun-Qian Li, Ming-Yi Ding, Yao-Jia Tang, Ruizhi Zhang, Renjing Xie
Publikováno v:
The Astrophysical Journal Letters, Vol 970, Iss 2, p L30 (2024)
Highly r -process-enhanced (RPE) stars are rare and usually metal poor ([Fe/H] < −1.0), and they mainly populate the Milky Way halo and dwarf galaxies. This study presents the discovery of a relatively bright ( V = 12.72), highly RPE ( r -II) star
Externí odkaz:
https://doaj.org/article/9142c84e25a9493dbcf3460632d832fe
Autor:
Kai Xiao, Bowen Huang, Yang Huang, Haibo Yuan, Timothy C. Beers, Jifeng Liu, Maosheng Xiang, Xue Lu, Shuai Xu, Lin Yang, Chuanjie Zheng, Zhirui Li, Bowen Zhang, Ruifeng Shi
Publikováno v:
The Astrophysical Journal Letters, Vol 968, Iss 2, p L24 (2024)
We search for an optimal filter design for the estimation of stellar metallicity, based on synthetic photometry from Gaia XP spectra convolved with a series of filter-transmission curves defined by different central wavelengths and bandwidths. Unlike
Externí odkaz:
https://doaj.org/article/6c818680dada4f73825b0e899235fd32
Autor:
Huiling Chen, Yang Huang, Wei Zhu, Timothy C. Beers, Renjing Xie, Yutao Zhou, Sharon Xuesong Wang, Wei Wang, Sofya Alexeeva, Qikang Feng, Haozhu Fu, Haining Li, Lile Wang, Huawei Zhang
Publikováno v:
The Astrophysical Journal Letters, Vol 966, Iss 2, p L27 (2024)
A recent study by Hon et al. reported that a close-in planet around the red clump star, 8 UMi, should have been engulfed during the expansion phase of its parent star’s evolution. They explained the survival of this exoplanet through a binary-merge
Externí odkaz:
https://doaj.org/article/d534721320214b5e8a8e36b2a5758af2
Autor:
Yang Huang, Timothy C. Beers, Kai Xiao, Haibo Yuan, Young Sun Lee, Hongrui Gu, Jihye Hong, Jifeng Liu, Zhou Fan, Paula Coelho, Patricia Cruz, F. J. Galindo-Guil, Simone Daflon, Fran Jiménez-Esteban, Javier Cenarro, David Cristóbal-Hornillos, Carlos Hernández-Monteagudo, Carlos López-Sanjuan, Antonio Marín-Franch, Mariano Moles, Jesús Varela, Héctor Vázquez Ramió, Jailson Alcaniz, Renato Dupke, Alessandro Ederoclite, Laerte Sodré Jr., Raul E. Angulo
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 192 (2024)
We present a catalog of stellar parameters (effective temperature T _eff , surface gravity $\mathrm{log}g$ , age, and metallicity [Fe/H]) and elemental-abundance ratios ([C/Fe], [Mg/Fe], and [ α /Fe]) for some five million stars (4.5 million dwarfs
Externí odkaz:
https://doaj.org/article/ad77f3edf33b4139943af0a68c73fc99
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 46 (2024)
Externí odkaz:
https://doaj.org/article/4fd2e27f3eee4b64adaab07d18904e76
Autor:
Avrajit Bandyopadhyay, Rana Ezzeddine, Carlos Allende Prieto, Nima Aria, Shivani P. Shah, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika M. Holmbeck, Vinicius M. Placco, Ian U. Roederer, Charli M. Sakari
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 274, Iss 2, p 39 (2024)
Understanding the abundance pattern of metal-poor stars and the production of heavy elements through various nucleosynthesis processes offers crucial insights into the chemical evolution of the Milky Way, revealing primary sites and major sources of
Externí odkaz:
https://doaj.org/article/9f18dccd1b74412c9634953d3a692cb4
Autor:
Jeremy Kowkabany, Rana Ezzeddine, Corinne Charbonnel, Ian U. Roederer, Ella Xi Wang, Yangyang Li, Zoe Hackshaw, Timothy C. Beers, Anna Frebel, Terese T. Hansen, Erika Holmbeck, Vinicius M. Placco, Charli M. Sakari
Publikováno v:
The Astrophysical Journal, Vol 973, Iss 2, p 125 (2024)
We present the discovery of 2MASS J05241392−0336543 (hereafter J0524−0336), a very metal-poor ([Fe/H] = −2.43 ± 0.16), highly r -process-enhanced ([Eu/Fe] = +1.34 ± 0.10) Milky Way halo field red giant star, with an ultrahigh Li abundance of
Externí odkaz:
https://doaj.org/article/787793d6ab884c2fabbad575dfea9b23
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 2, p 151 (2024)
The Doppler beaming effect, induced by the reflex motion of stars, introduces flux modulations and serves as an efficient method to photometrically determine mass functions for a large number of close binary systems, particularly those involving comp
Externí odkaz:
https://doaj.org/article/6141570c1cb04574aa909a0b0d8f154a
Autor:
Ian U. Roederer, Timothy C. Beers, Kohei Hattori, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 158 (2024)
We present stellar parameters and chemical abundances of 47 elements detected in the bright ( V = 11.63) very metal-poor ([Fe/H] = −2.20 ± 0.12) star 2MASS J22132050−5137385. We observed this star using the Magellan Inamori Kyocera Echelle spect
Externí odkaz:
https://doaj.org/article/2d11aa88c5fc4f40bc5f093fadd3089c
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 35 (2024)
Chemical anomalies in planet-hosting stars (PHSs) are studied in order to assess how the planetary nature and multiplicity affect the atmospheric chemical abundances of their host stars. We employ APOGEE DR17 to select thin-disk stars of the Milky Wa
Externí odkaz:
https://doaj.org/article/f07d5b7f7cfa4b639ff4fb48a503f5a5