The S2 Stream: the shreds of a primitive dwarf galaxy
The S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resoluti...
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| creator | Aguado, David S Myeong, G C Belokurov, Vasily Evans, N W Koposov, Sergey E Carlos Allende Prieto Lanfranchi, Gustavo A Matteucci, Francesca Shetrone, Matthew Sbordone, Luca Navarrete, Camila González Hernández, Jonay I Chanamé, Julio Luis Peralta de Arriba Yuan, Zhen |
| description | The S2 stream is a kinematically cold stream that is plunging downwards through the Galactic disc. It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resolution spectroscopy, complemented with a re-analysis of the archival data to give a total sample of 62 S2 members. Our high-resolution program provides alpha-elements (C, Mg, Si, Ca and Ti), iron-peak elements (V, Cr, Mn, Fe, Ni), n-capture process elements (Sr, Ba) and other elements such as Li, Na, Al, and Sc for a subsample of S2 objects. We report coherent abundance patterns over a large metallicity spread (~1 dex) confirming that the S2 stream was produced by a disrupted dwarf galaxy. The combination of S2's \(\alpha\)-elements displays a mildly decreasing trend with increasing metallicity which can be tentatively interpreted as a ``knee'' at [Fe/H] |
| doi_str_mv | 10.48550/arxiv.2007.11003 |
| format | Article |
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It may be part of a hotter and more diffuse structure called the Helmi stream. We present a multi-instrument chemical analysis of the stars in the metal-poor S2 stream using both high- and low-resolution spectroscopy, complemented with a re-analysis of the archival data to give a total sample of 62 S2 members. Our high-resolution program provides alpha-elements (C, Mg, Si, Ca and Ti), iron-peak elements (V, Cr, Mn, Fe, Ni), n-capture process elements (Sr, Ba) and other elements such as Li, Na, Al, and Sc for a subsample of S2 objects. We report coherent abundance patterns over a large metallicity spread (~1 dex) confirming that the S2 stream was produced by a disrupted dwarf galaxy. The combination of S2's \(\alpha\)-elements displays a mildly decreasing trend with increasing metallicity which can be tentatively interpreted as a ``knee'' at [Fe/H]<-2. At the low metallicity end, the n-capture elements in S2 may be dominated by r-process production however several stars are Ba-enhanced, but unusually poor in Sr. Moreover, some of the low-[Fe/H] stars appear to be carbon-enhanced. We interpret the observed abundance patterns with the help of chemical evolution models that demonstrate the need for modest star-formation efficiency and low wind efficiency confirming that the progenitor of S2 was a primitive dwarf galaxy.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.2007.11003</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Abundance ; Alpha iron ; Barium ; Chemical analysis ; Chemical evolution ; Dwarf galaxies ; Magnesium ; Manganese ; Metallicity ; Nickel ; Physics - Astrophysics of Galaxies ; Star formation ; Stars & galaxies ; Stellar evolution ; Stellar winds ; Strontium ; Titanium</subject><ispartof>arXiv.org, 2020-10</ispartof><rights>2020. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). 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At the low metallicity end, the n-capture elements in S2 may be dominated by r-process production however several stars are Ba-enhanced, but unusually poor in Sr. Moreover, some of the low-[Fe/H] stars appear to be carbon-enhanced. We interpret the observed abundance patterns with the help of chemical evolution models that demonstrate the need for modest star-formation efficiency and low wind efficiency confirming that the progenitor of S2 was a primitive dwarf galaxy.</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.2007.11003</doi><oa>free_for_read</oa></addata></record> |
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| source | Freely Accessible Journals; arXiv.org |
| subjects | Abundance Alpha iron Barium Chemical analysis Chemical evolution Dwarf galaxies Magnesium Manganese Metallicity Nickel Physics - Astrophysics of Galaxies Star formation Stars & galaxies Stellar evolution Stellar winds Strontium Titanium |
| title | The S2 Stream: the shreds of a primitive dwarf galaxy |
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