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Results 1 - 35 of 35

The R-Process Alliance: 2MASS J22132050–5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe] = +2.45
- Volume 19, Issue 33 - article #7
- Ian U. Roederer, Timothy C. Beers, Kohei Hattori, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/ad57bf
The R-Process Alliance: 2MASS J22132050-5137385, the Star with the Highest-known r-process Enhancement at [Eu/Fe] = +2.45
- Volume 19, Issue 23 - article #4
- Ian U. Roederer, Timothy C. Beers, Kohei Hattori, Vinicius M. Placco, Terese T. Hansen, Rana Ezzeddine, Anna Frebel, Erika M. Holmbeck, Charli M. Sakari
- https://arxiv.org/abs/2406.02691
Metallicity and $alpha$-abundance for 48 million stars in low-extinction regions in the Milky Way
- Volume 19, Issue 14 - article #3
- Kohei Hattori (NAOJ, The Institute of Statistical Mathematics)
- https://arxiv.org/abs/2404.01269
Finding r-II Sibling Stars in the Milky Way with the Greedy Optimistic Clustering Algorithm
- Volume 18, Issue 13 - article #14
- Kohei Hattori, Akifumi Okuno, Ian U. Roederer
- The Astrophysical Journal
- https://doi.org/10.3847/1538-4357/acb93b
Finding $r$-II sibling stars in the Milky Way with the Greedy Optimistic Clustering algorithm. (arXiv:2207.04110v1 [astro-ph.GA])
- Volume 17, Issue 28 - article #1
- Kohei Hattori (1,2,3), Akifumi Okuno (2,4), Ian U. Roederer (3,5) ((1) NAOJ, (2) Institute of Statistical Mathematics, (3) Michigan, (4) RIKEN AIP, (5) JINA-CEE)
- http://arxiv.org/abs/2207.04110
The R-process Alliance: A Nearly Complete R-process Abundance Template Derived from Ultraviolet Spectroscopy of the R-process-enhanced Metal-poor Star HD 222925
- Volume 17, Issue 24 - article #20
- Ian U. Roederer, James E. Lawler, Elizabeth A. Den Hartog, Vinicius M. Placco, Rebecca Surman, Timothy C. Beers, Rana Ezzeddine, Anna Frebel, Terese T. Hansen, Kohei Hattori
- The Astrophysical Journal Supplement
- https://doi.org/10.3847/1538-4365/ac5cbc
High-precision chemical abundances of Galactic building blocks. II. Revisiting the chemical distinctness of the Helmi streams. (arXiv:2203.11808v1 [astro-ph.GA])
- Volume 17, Issue 12 - article #4
- Tadafumi Matsuno, Emma Dodd, Helmer H. Koppelman, Amina Helmi, Miho N. Ishigaki, Wako Aoki, Jingkun Zhao, Zhen Yuan, Kohei Hattori
- http://arxiv.org/abs/2203.11808
Dynamically Tagged Groups of Metal-poor Stars from the Best and Brightest Survey
- Volume 17, Issue 6 - article #5
- Derek Shank, Timothy C. Beers, Vinicius M. Placco, Guilherme Limberg, Emma Jaques, Zhen Yuan, Kevin C. Schlaufman, Andrew R. Casey, Yang Huang, Young Sun Lee, Kohei Hattori,, Rafael M. Santucci
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/926/1/26
A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood
- Volume 17, Issue 4 - article #13
- Noriyuki Matsunaga, Akinori Itane, Kohei Hattori, Juliana Crestani, Vittorio Braga, Giuseppe Bono, Daisuke Taniguchi, Junichi Baba, Hiroyuki Maehara, Nobuharu Ukita, Tsuyoshi Sakamoto, Naoto Kobayashi, Tsutomu Aoki, Takao Soyano, Kenâichi Tarusawa, Yuki Sarugaku, Hiroyuki Mito, Shigeyuki Sako, Mamoru Doi, Yoshikazu Nakada, Natsuko Izumi, Yoshifusa Ita, Hiroki Onozato, Mingjie Jian, Sohei Kondo, Satoshi Hamano, Chikako Yasui, Takuji Tsujimoto, Shogo Otsubo, Yuji Ikeda,, Hideyo Kawakita
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/925/1/10
A Very Metal-poor RR Lyrae Star with a Disk Orbit Found in the Solar Neighborhood. (arXiv:2201.05402v1 [astro-ph.SR])
- Volume 17, Issue 3 - article #2
- Noriyuki Matsunaga, Akinori Itane, Kohei Hattori, Juliana Crestani, Vittorio Braga, Giuseppe Bono, Daisuke Taniguchi, Junichi Baba, Hiroyuki Maehara, Nobuharu Ukita, Tsuyoshi Sakamoto, Naoto Kobayashi, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yuki Sarugaku, Hiroyuki Mito, Shigeyuki Sako, Mamoru Doi, Yoshikazu Nakada, Natsuko Izumi, Yoshifusa Ita, Hiroki Onozato, Mingjie Jian, Sohei Kondo, Satoshi Hamano, Chikako Yasui, Takuji Tsujimoto, Shogo Otsubo, Yuji Ikeda, Hideyo Kawakita
- http://arxiv.org/abs/2201.05402
High-precision chemical abundances of Galactic building blocks. The distinct chemical abundance sequence of Sequoia. (arXiv:2111.15423v1 [astro-ph.GA])
- Volume 16, Issue 49 - article #4
- Tadafumi Matsuno, Helmer H. Koppelman, Amina Helmi, Wako Aoki, Miho N. Ishigaki, Takuma Suda, Zhen Yuan, Kohei Hattori
- http://arxiv.org/abs/2111.15423
Dynamically Tagged Groups of Metal-Poor Stars from the Best & Brightest Survey. (arXiv:2109.08600v1 [astro-ph.GA])
- Volume 16, Issue 39 - article #2
- Derek Shank, Timothy C. Beers, Vinicius M. Placco, Guilherme Limberg, Emma Jaques, Zhen Yuan, Kevin C. Schlaufman, Andrew R. Casey, Yang Huang, Young Sun Lee, Kohei Hattori, Rafael M. Santucci
- http://arxiv.org/abs/2109.08600
591 High-velocity Stars in the Galactic Halo Selected from LAMOST DR7 and Gaia DR2
- Volume 15, Issue 51 - article #8
- Yin-Bi Li, A-Li Luo, You-Jun Lu, Xue-Sen Zhang, Jiao Li, Rui Wang, Fang Zuo, Maosheng Xiang, Yuan-Sen Ting, Tommaso Marchetti, Shuo Li, You-Fen Wang, Shuo Zhang, Kohei Hattori, Yong-Heng Zhao, Hua-Wei Zhang,, Gang Zhao
- The Astrophysical Journal Supplement Series
- http://iopscience.iop.org/0067-0049/252/1/3
The Southern Stellar Stream Spectroscopic Survey ( S 5 ): Chemical Abundances of Seven Stellar Streams
- Volume 15, Issue 39 - article #15
- Alexander P. Ji, Ting S. Li, Terese T. Hansen, Andrew R. Casey, Sergey E. Koposov, Andrew B. Pace, Dougal Mackey, Geraint F. Lewis, Jeffrey D. Simpson, Joss Bland-Hawthorn, Lara R. Cullinane, Gary. S. Da Costa, Kohei Hattori, Sarah L. Martell, Kyler Kuehn, Denis Erkal, Nora Shipp, Zhen Wan,, Daniel B. Zucker
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/160/4/181
The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams. (arXiv:2008.07568v1 [astro-ph.SR])
- Volume 15, Issue 34 - article #6
- Alexander P. Ji, Ting S. Li, Terese T. Hansen, Andrew R. Casey, Sergey E. Koposov, Andrew B. Pace, Dougal Mackey, Geraint F. Lewis, Jeffrey D. Simpson, Joss Bland-Hawthorn, Lara R. Cullinane, Gary. S. Da Costa, Kohei Hattori, Sarah L. Martell, Kyler Kuehn, Denis Erkal, Nora Shipp, Zhen Wan, Daniel B. Zucker
- http://arxiv.org/abs/2008.07568
The R -Process Alliance: A Very Metal-poor, Extremely r -process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of r- III Stars
- Volume 15, Issue 30 - article #11
- Madelyn Cain, Anna Frebel, Alexander P. Ji, Vinicius M. Placco, Rana Ezzeddine, Ian U. Roederer, Kohei Hattori, Timothy C. Beers, Jorge MelÃ©ndez, Terese T. Hansen,, Charli M. Sakari
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/898/1/40
Broken into Pieces: ATLAS and Aliqa Uma as One Single Stream. (arXiv:2006.10763v1 [astro-ph.GA])
- Volume 15, Issue 26 - article #3
- Ting S. Li, Sergey E. Koposov, Denis Erkal, Alexander P. Ji, Nora Shipp, Andrew B. Pace, Tariq Hilmi, Kyler Kuehn, Geraint F. Lewis, Dougal Mackey, Jeffrey D. Simpson, Zhen Wan, Daniel B. Zucker, Joss Bland-Hawthorn, Lara R. Cullinane, Gary S. Da Costa, Alex Drlica-Wagner, Kohei Hattori, Sarah L. Martell, Sanjib Sharma
- http://arxiv.org/abs/2006.10763
The R-Process Alliance: J1521-3538, a very metal-poor, extremely r-process-enhanced star with [Eu/Fe]=+2.2, and the class of r-III stars. (arXiv:2006.08080v1 [astro-ph.SR])
- Volume 15, Issue 25 - article #15
- Madelyn Cain (MIT, JINA), Anna Frebel (MIT, JINA), Alexander P. Ji (Carnegie), Vinicius M. Placco (Notre Dame, JINA), Rana Ezzeddine (MIT, JINA), Ian U. Roederer (U Michigan), Kohei Hattori (U Michigan, Carnegie Mellon), Timothy C. Beers (Notre Dame, JINA), Jorge Mélendez (Sao Paulo), Terese T. Hansen (Carnegie), Charli M. Sakari (San Francisco State U, JINA)
- http://arxiv.org/abs/2006.08080
Dynamical Relics of the Ancient Galactic Halo
- Volume 15, Issue 10 - article #5
- Zhen Yuan, G. C. Myeong, Timothy C. Beers, N. W. Evans, Young Sun Lee, Projjwal Banerjee, Dmitrii Gudin, Kohei Hattori, Haining Li, Tadafumi Matsuno, Vinicius M. Placco, M. C. Smith, Devin D. Whitten,, Gang Zhao
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/891/1/39
Dynamical Relics of the Ancient Galactic Halo. (arXiv:1910.07538v1 [astro-ph.GA])
- Volume 14, Issue 42 - article #1
- Zhen Yuan (1), G.C. Myeong (2,3), Timothy C. Beers (4), N. Wyn Evans (3), Young Sun Lee (5), Projjwal Banerjee (6), Dmitrii Gudin (4), Kohei Hattori (7), Haining Li (8), Tadafumi Matsuno (9), Vinicius M. Placco (4), M. C. Smith (1), Devin D. Whitten (4), Gang Zhao (8) ((1) SAO, Shanghai, (2) CfA, Harvard, (3) IoA, Cambridge, (4) Notre Dame, (5) Chungnam Univ, Daejeon, (6) Indian Institute of Technology, Palakkad, (7) CMU, Pittsburgh (8) NAO, Beijing, (9) NAOJ, Tokyo)
- http://arxiv.org/abs/1910.07538
Old, Metal-poor Extreme Velocity Stars in the Solar Neighborhood
- Volume 13, Issue 42 - article #8
- Kohei Hattori, Monica Valluri, Eric F. Bell,, Ian U. Roederer
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/866/2/121
Kinematics of Highly r -process-enhanced Field Stars: Evidence for an Accretion Origin and Detection of Several Groups from Disrupted Satellites
- Volume 13, Issue 41 - article #14
- Ian U. Roederer, Kohei Hattori,, Monica Valluri
- The Astronomical Journal
- http://iopscience.iop.org/1538-3881/156/4/179
Kinematics of Highly R-Process-Enhanced Field Stars: Evidence for an Accretion Origin and Detection of Several Groups from Disrupted Satellites. (arXiv:1808.09467v1 [astro-ph.SR])
- Volume 13, Issue 35 - article #4
- Ian U. Roederer (U. Michigan, JINA-CEE), Kohei Hattori (U. Michigan), Monica Valluri (U. Michigan)
- http://arxiv.org/abs/1808.09467
Old, Metal-Poor Extreme Velocity Stars in the Solar Neighborhood. (arXiv:1805.03194v2 [astro-ph.GA] UPDATED)
- Volume 13, Issue 21 - article #4
- Kohei Hattori (1), Monica Valluri (1), Eric F. Bell (1), Ian U. Roederer (1, 2) ((1) University of Michigan, (2) JINA-CEE)
- http://arxiv.org/abs/1805.03194
Metallicity dependence of the Hercules stream in Gaia/RAVE data -- explanation by non-closed orbits. (arXiv:1804.01920v1 [astro-ph.GA])
- Volume 13, Issue 14 - article #11
- Kohei Hattori (1), Naoteru Gouda (2, 3), Taihei Yano (2, 3), Nobuyuki Sakai (2), Hiromichi Tagawa (2, 4), Junichi Baba (2), Jun Kumamoto (2, 5) ((1) University of Michigan, (2) NAOJ, (3) SOKENDAI, (4) Eotvos University, (5) Tohoku University)
- http://arxiv.org/abs/1804.01920
Beta Dips in the Gaia Era: Simulation Predictions of the Galactic Velocity Anisotropy Parameter ( β ) for Stellar Halos
- Volume 13, Issue 6 - article #11
- Sarah R. Loebman, Monica Valluri, Kohei Hattori, Victor P. Debattista, Eric F. Bell, Greg Stinson, Charlotte R. Christensen, Alyson Brooks, Thomas R. Quinn,, Fabio Governato
- The Astrophysical Journal
- http://iopscience.iop.org/0004-637X/853/2/196
Beta Dips in the Gaia Era: Simulation Predictions of the Galactic Velocity Anisotropy Parameter for Stellar Halos. (arXiv:1704.06264v1 [astro-ph.GA])
- Volume 12, Issue 17 - article #1
- Sarah R. Loebman, Monica Valluri, Kohei Hattori, Victor P. Debattista, Eric F. Bell, Greg Stinson, Charlotte R. Christensen, Alyson Brooks, Thomas R. Quinn, Fabio Governato
- http://arxiv.org/abs/1704.06264
Reliability of the measured velocity anisotropy of the Milky Way stellar halo. (arXiv:1704.06286v1 [astro-ph.GA])
- Volume 12, Issue 17 - article #4
- Kohei Hattori, Monica Valluri, Sarah R. Loebman, Eric F.Bell (University of Michigan)
- http://arxiv.org/abs/1704.06286
Vertical kinematics of the thick disc at 4.5 ≲ R ≲ 9.5 kpc
- Volume 10, Issue 39 - article #26
- Kohei Hattori and Gerard Gilmore
- Monthly Notices of the Royal Astronomical Society - Volume: 454, Issue: 1
- Abstract Full Text (HTML) Full Text (PDF)
Vertical kinematics of the thick disc at 4.5 < R < 9.5 kpc
- Volume 10, Issue 30 - article #15
- Kohei Hattori, Gerard Gilmore (Institute of Astronomy, Cambridge, UK)
- arXiv.org - Astrophysics - Volume: 2015, Issue: 21 Aug
- arXiv:1508.04429 [pdf, ps, other]
Possible Evidence for Metal Accretion onto the Surfaces of Metal-poor Main-sequence Stars
- Volume 9, Issue 17 - article #25
- Kohei Hattori, Yuzuru Yoshii, Timothy C. Beers, Daniela Carollo, and Young Sun Lee
- The Astrophysical Journal - Volume: 784, Issue: 2
- View article PDF (1.35 MB)
Possible Evidence for Metal Accretion onto the Surfaces of Metal-Poor Main-Sequence Stars
- Volume 9, Issue 8 - article #6
- Kohei Hattori, Yuzuru Yoshii, Timothy C. Beers, Daniela Carollo, Young Sun Lee
- arXiv.org - Astrophysics - Volume: 2014, Issue: 21 Feb
- arXiv:1402.4251 [pdf, ps, other]
Very Metal-Poor Outer-Halo Stars with Round Orbits
- Volume 7, Issue 51 - article #13
- Kohei Hattori, Yuzuru Yoshii, Timothy C. Beers, Daniela Carollo, Young Sun Lee
- arXiv.org - Astrophysics - Volume: 2012, Issue: 21 Dec
- arXiv:1212.4296 [pdf, ps, other]
Orbital Eccentricity Distribution of Solar-Neighbour Halo Stars
- Volume 6, Issue 34 - article #12
- Kohei Hattori (1), Yuzuru Yoshii (1) ((1) Institute of Astronomy, School of Science, University of Tokyo)
- arXiv.org - Astrophysics - Volume: 2011, Issue: 26 Aug
- arXiv:1108.4103 [pdf, ps, other]
A new test for the Galactic formation and evolution -- prediction for the orbital eccentricity distribution of the halo stars
- Volume 5, Issue 21 - article #1
- Kohei Hattori, Yuzuru Yoshii
- arXiv.org - Astrophysics - Volume: 2010, Issue: 21 May
- arXiv:1005.3685 [pdf, ps, other]

Results 1 - 35 of 35

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