Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Mohammad K. Mardini"'
Autor:
Jihye Hong, Timothy C. Beers, Young Sun Lee, Yang Huang, Yutaka Hirai, Jonathan Cabrera Garcia, Derek Shank, Shuai Xu, Haibo Yuan, Mohammad K. Mardini, Thomas Catapano, Gang Zhao, Zhou Fan, Jie Zheng, Wei Wang, Kefeng Tan, Jingkun Zhao, Chun Li
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 273, Iss 1, p 12 (2024)
Photometric stellar surveys now cover a large fraction of the sky, probe to fainter magnitudes than large-scale spectroscopic surveys, and are relatively free from the target selection biases often associated with such studies. Photometric-metallicit
Externí odkaz:
https://doaj.org/article/59f813e9f7da436c9480c01d24f83f27
Autor:
Xiaowei Ou, Anirudh Chiti, Nora Shipp, Joshua D. Simon, Marla Geha, Anna Frebel, Mohammad K. Mardini, Denis Erkal, Lina Necib
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 1, p 33 (2024)
The Hercules ultrafaint dwarf galaxy (UFD) has long been hypothesized to be tidally disrupting, yet no conclusive evidence has been found for tidal disruption owing partly to difficulties in identifying Hercules member stars. In this work, we present
Externí odkaz:
https://doaj.org/article/d4e2e864b159417682b591e106f2821c
Autor:
Vinicius M. Placco, Felipe Almeida-Fernandes, Erika M. Holmbeck, Ian U. Roederer, Mohammad K. Mardini, Christian R. Hayes, Kim Venn, Kristin Chiboucas, Emily Deibert, Roberto Gamen, Jeong-Eun Heo, Miji Jeong, Venu Kalari, Eder Martioli, Siyi Xu, Ruben Diaz, Manuel Gomez-Jimenez, David Henderson, Pablo Prado, Carlos Quiroz, Roque Ruiz-Carmona, Chris Simpson, Cristian Urrutia, Alan W. McConnachie, John Pazder, Gregory Burley, Michael Ireland, Fletcher Waller, Trystyn A. M. Berg, J. Gordon Robertson, Zachary Hartman, David O. Jones, Kathleen Labrie, Gabriel Perez, Susan Ridgway, Joanna Thomas-Osip
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 1, p 60 (2023)
We report on a chemo-dynamical analysis of SPLUS J142445.34−254247.1 (SPLUS J1424−2542), an extremely metal-poor halo star enhanced in elements formed by the rapid neutron-capture process ( r -process). This star was first selected as a metal-poo
Externí odkaz:
https://doaj.org/article/a253f5ad355e48d783e9c8f4b24f320a
Autor:
Anirudh Chiti, Anna Frebel, Alexander P. Ji, Mohammad K. Mardini, Xiaowei Ou, Joshua D. Simon, Helmut Jerjen, Dongwon Kim, John E. Norris
Publikováno v:
The Astronomical Journal, Vol 165, Iss 2, p 55 (2023)
We present chemical abundances and velocities of five stars between 0.3 and 1.1 kpc from the center of the Tucana II ultrafaint dwarf galaxy (UFD) from high-resolution Magellan/MIKE spectroscopy. We find that every star is deficient in metals (−3.6
Externí odkaz:
https://doaj.org/article/b1e89a9bf01e4a128d23ccd3c4f37245
Autor:
Mohammad K Mardini, Anna Frebel, Rana Ezzeddine, Anirudh Chiti, Yohai Meiron, Alexander P Ji, Vinicius M Placco, Ian U Roederer, Jorge Meléndez
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 517:3993-4004
We present a high-resolution (R ∼ 35 000), high signal-to-noise (S/N = 350) Magellan/MIKE spectrum of the bright extremely metal-poor star 2MASS J1808−5104. We find [Fe/H] = −4.01 (spectroscopic LTE stellar parameters), [Fe/H] = −3.8 (photome
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e73c6dc752d57dc78ef2dfe54c3bc6cf
https://doi.org/10.1093/mnras/stac2783
https://doi.org/10.1093/mnras/stac2783
Autor:
Hamid M. K. Al-Naimiy, Mohammad K. Mardini, F. A. Suleiman, Ali Taani, Mashhoor A. Al-Wardat, Y. M. Al-Tawalbeh, Abdallah M. Hussein, A. A. Abushattal, Awni Khasawneh, N.A. Yusuf
Publikováno v:
Astrophysical Bulletin. 76:71-83
In this work, the orbital elements are improved and the total masses of the three close visual binary systems CVBSs: HIP 11352, HIP 70973, and HIP 72479 are precisely calculated. The calculations were performed based on an assessment of the latest Ga
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4db98142aaa46f9dab218c3eb9146156
https://doi.org/10.1134/s199034132101003x
https://doi.org/10.1134/s199034132101003x
Autor:
Anirudh Chiti, Anna Frebel, Alexander P. Ji, Mohammad K. Mardini, Xiaowei Ou, Joshua D. Simon, Helmut Jerjen, Dongwon Kim, John E. Norris
We present chemical abundances and velocities of five stars between 0.3 kpc to 1.1 kpc from the center of the Tucana II ultra-faint dwarf galaxy (UFD) from high-resolution Magellan/MIKE spectroscopy. We find that every star is deficient in metals (-3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe64c2346a187cdfb0c5617cb522b866
Autor:
Hatem Widyan, N.A. Yusuf, Enas Abu-Alrob, Zahraa T. Yousef, Mashhoor A. Al-Wardat, Ali Taani, Abdallah M. Hussein, Hamid M. K. Al-Naimiy, Mohammad K. Mardini
The data release DR2 of Gaia mission was of great help in precise determination of fundamental parameters of Close Visual Binary and Multiple Systems (CVBMSs), especially masses of their components, which are crucial parameters in understating format
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7217841959f050b865aefb5bc1529237
http://arxiv.org/abs/2111.11675
http://arxiv.org/abs/2111.11675
Autor:
Kaley Brauer, Hillary Diane Andales, Alexander P. Ji, Anna Frebel, Mohammad K. Mardini, Facundo A. Gómez, Brian W. O’Shea
Publikováno v:
The Astrophysical Journal. 937:14
The Milky Way has accreted many ultra-faint dwarf galaxies (UFDs), and stars from these galaxies can be found throughout our Galaxy today. Studying these stars provides insight into galaxy formation and early chemical enrichment, but identifying them
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::486724b197a64d3a3dfc96293a0c6433
https://doi.org/10.3847/1538-4357/ac85b9
https://doi.org/10.3847/1538-4357/ac85b9
Publikováno v:
The Astrophysical Journal. 936:78
We have developed a chemodynamical approach to assign 36,010 metal-poor SkyMapper stars to various Galactic stellar populations. Using two independent techniques (velocity and action space behavior), Gaia EDR3 astrometry, and photometric metallicitie
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8613d454fa7245e9d4c354c1c7c24f74
https://doi.org/10.3847/1538-4357/ac8102
https://doi.org/10.3847/1538-4357/ac8102