The Abundance Pattern of α Elements in the Triangulum–Andromeda Overdensity
The close relationship between the nature of the Triangulum–Andromeda (TriAnd) overdensity and the Galactic disk has become increasingly evident in recent years. However, the chemical pattern of this overdensity ( R GC = 20–30 kpc) is unique and differs from what we know of the local disk. In this...
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| Veröffentlicht in: | The Astrophysical journal 2020-09, Vol.901 (1), p.27 |
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| container_title | The Astrophysical journal |
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| creator | Silva, J. V. Sales Cunha, K. Perottoni, H. D. Rocha-Pinto, H. J. Daflon, S. Almeida-Fernandes, F. Souto, Diogo Majewski, S. R. |
| description | The close relationship between the nature of the Triangulum–Andromeda (TriAnd) overdensity and the Galactic disk has become increasingly evident in recent years. However, the chemical pattern of this overdensity (
R
GC
= 20–30 kpc) is unique and differs from what we know of the local disk. In this study, we analyze the chemical abundances of five
α
elements (Mg, O, Si, Ca, and Ti) in a sample of stars belonging to the TriAnd overdensity, including stars with [Fe/H] |
| doi_str_mv | 10.3847/1538-4357/abaaad |
| format | Article |
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R
GC
= 20–30 kpc) is unique and differs from what we know of the local disk. In this study, we analyze the chemical abundances of five
α
elements (Mg, O, Si, Ca, and Ti) in a sample of stars belonging to the TriAnd overdensity, including stars with [Fe/H] < −1.2, to investigate the evolution of the
α
elements with metallicity. High-resolution spectra from Gemini North with GRACES were analyzed. Overall, the TriAnd population presents an
α
-element pattern that differs from that of the local disk; the TriAnd stars fall in between the local disk and the dwarf galaxies in the [X/Fe] versus [Fe/H] plane. The high [Mg/Fe] ratios obtained for the lower metallicity TriAnd stars may indicate a roughly parallel sequence to the Milky Way local disk at lower values of [Fe/H], revealing a
knee
shifted toward lower metallicities for the TriAnd population. Similar behavior is also exhibited in the [Ca/Fe] and [Si/Fe] ratios. However, for O and Ti the behavior of the [X/Fe] ratios shows a slight decay with decreasing metallicity. Our results reinforce the TriAnd overdensity as a unique stellar population of the Milky Way, with an abundance pattern that is different from all stellar populations studied to date. The complete understanding of the complex TriAnd population will require high-resolution spectroscopic observations of a larger sample of TriAnd stars.</description><identifier>ISSN: 0004-637X</identifier><identifier>EISSN: 1538-4357</identifier><identifier>DOI: 10.3847/1538-4357/abaaad</identifier><language>eng</language><publisher>Philadelphia: IOP Publishing</publisher><subject>Abundance ; Andromeda Galaxy ; Astrophysics ; Calcium ; Dwarf galaxies ; Galactic disk ; High resolution ; Iron ; Magnesium ; Metallicity ; Milky Way ; Silicon ; Stellar evolution ; Stellar populations ; Titanium</subject><ispartof>The Astrophysical journal, 2020-09, Vol.901 (1), p.27</ispartof><rights>Copyright IOP Publishing Sep 01, 2020</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c313t-d61a624a95778ceaadc9bd71f84eeeb44e28dbf20b7f31bf6bb5796ef55901ab3</citedby><cites>FETCH-LOGICAL-c313t-d61a624a95778ceaadc9bd71f84eeeb44e28dbf20b7f31bf6bb5796ef55901ab3</cites><orcidid>0000-0003-0636-7463 ; 0000-0002-0537-4146 ; 0000-0002-5274-4955 ; 0000-0003-2025-3147 ; 0000-0001-6476-0576 ; 0000-0002-7883-5425</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,27901,27902</link.rule.ids></links><search><creatorcontrib>Silva, J. V. Sales</creatorcontrib><creatorcontrib>Cunha, K.</creatorcontrib><creatorcontrib>Perottoni, H. D.</creatorcontrib><creatorcontrib>Rocha-Pinto, H. J.</creatorcontrib><creatorcontrib>Daflon, S.</creatorcontrib><creatorcontrib>Almeida-Fernandes, F.</creatorcontrib><creatorcontrib>Souto, Diogo</creatorcontrib><creatorcontrib>Majewski, S. R.</creatorcontrib><title>The Abundance Pattern of α Elements in the Triangulum–Andromeda Overdensity</title><title>The Astrophysical journal</title><description>The close relationship between the nature of the Triangulum–Andromeda (TriAnd) overdensity and the Galactic disk has become increasingly evident in recent years. However, the chemical pattern of this overdensity (
R
GC
= 20–30 kpc) is unique and differs from what we know of the local disk. In this study, we analyze the chemical abundances of five
α
elements (Mg, O, Si, Ca, and Ti) in a sample of stars belonging to the TriAnd overdensity, including stars with [Fe/H] < −1.2, to investigate the evolution of the
α
elements with metallicity. High-resolution spectra from Gemini North with GRACES were analyzed. Overall, the TriAnd population presents an
α
-element pattern that differs from that of the local disk; the TriAnd stars fall in between the local disk and the dwarf galaxies in the [X/Fe] versus [Fe/H] plane. The high [Mg/Fe] ratios obtained for the lower metallicity TriAnd stars may indicate a roughly parallel sequence to the Milky Way local disk at lower values of [Fe/H], revealing a
knee
shifted toward lower metallicities for the TriAnd population. Similar behavior is also exhibited in the [Ca/Fe] and [Si/Fe] ratios. However, for O and Ti the behavior of the [X/Fe] ratios shows a slight decay with decreasing metallicity. Our results reinforce the TriAnd overdensity as a unique stellar population of the Milky Way, with an abundance pattern that is different from all stellar populations studied to date. The complete understanding of the complex TriAnd population will require high-resolution spectroscopic observations of a larger sample of TriAnd stars.</description><subject>Abundance</subject><subject>Andromeda Galaxy</subject><subject>Astrophysics</subject><subject>Calcium</subject><subject>Dwarf galaxies</subject><subject>Galactic disk</subject><subject>High resolution</subject><subject>Iron</subject><subject>Magnesium</subject><subject>Metallicity</subject><subject>Milky Way</subject><subject>Silicon</subject><subject>Stellar evolution</subject><subject>Stellar populations</subject><subject>Titanium</subject><issn>0004-637X</issn><issn>1538-4357</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNo9kE1OwzAQRi0EEqWwZ2mJdagdO3GyrKryI1WURZDYWXY8hlSNU2wHqTvuwEm4CIfgJCQqYjWa0dPMfA-hS0quWcHFjGasSDjLxExppZQ5QpP_0TGaEEJ4kjPxfIrOQtiMbVqWE_RQvQKe694Z5WrAjypG8A53Fn9_4eUWWnAx4MbhOHCVb5R76bd9-_PxOXfGdy0Yhdfv4A240MT9OTqxahvg4q9O0dPNslrcJav17f1ivkpqRllMTE5VnnJVZkIUNQzv1qU2gtqCA4DmHNLCaJsSLSyj2uZaZ6LMwWZZSajSbIquDnt3vnvrIUS56XrvhpMy5Zzn2RCPDRQ5ULXvQvBg5c43rfJ7SYkcrclRkRwVyYM19guMXGPE</recordid><startdate>20200901</startdate><enddate>20200901</enddate><creator>Silva, J. V. Sales</creator><creator>Cunha, K.</creator><creator>Perottoni, H. D.</creator><creator>Rocha-Pinto, H. J.</creator><creator>Daflon, S.</creator><creator>Almeida-Fernandes, F.</creator><creator>Souto, Diogo</creator><creator>Majewski, S. R.</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>8FD</scope><scope>H8D</scope><scope>KL.</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0003-0636-7463</orcidid><orcidid>https://orcid.org/0000-0002-0537-4146</orcidid><orcidid>https://orcid.org/0000-0002-5274-4955</orcidid><orcidid>https://orcid.org/0000-0003-2025-3147</orcidid><orcidid>https://orcid.org/0000-0001-6476-0576</orcidid><orcidid>https://orcid.org/0000-0002-7883-5425</orcidid></search><sort><creationdate>20200901</creationdate><title>The Abundance Pattern of α Elements in the Triangulum–Andromeda Overdensity</title><author>Silva, J. V. Sales ; Cunha, K. ; Perottoni, H. D. ; Rocha-Pinto, H. J. ; Daflon, S. ; Almeida-Fernandes, F. ; Souto, Diogo ; Majewski, S. R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c313t-d61a624a95778ceaadc9bd71f84eeeb44e28dbf20b7f31bf6bb5796ef55901ab3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Abundance</topic><topic>Andromeda Galaxy</topic><topic>Astrophysics</topic><topic>Calcium</topic><topic>Dwarf galaxies</topic><topic>Galactic disk</topic><topic>High resolution</topic><topic>Iron</topic><topic>Magnesium</topic><topic>Metallicity</topic><topic>Milky Way</topic><topic>Silicon</topic><topic>Stellar evolution</topic><topic>Stellar populations</topic><topic>Titanium</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Silva, J. V. Sales</creatorcontrib><creatorcontrib>Cunha, K.</creatorcontrib><creatorcontrib>Perottoni, H. D.</creatorcontrib><creatorcontrib>Rocha-Pinto, H. J.</creatorcontrib><creatorcontrib>Daflon, S.</creatorcontrib><creatorcontrib>Almeida-Fernandes, F.</creatorcontrib><creatorcontrib>Souto, Diogo</creatorcontrib><creatorcontrib>Majewski, S. R.</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>The Astrophysical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Silva, J. V. Sales</au><au>Cunha, K.</au><au>Perottoni, H. D.</au><au>Rocha-Pinto, H. J.</au><au>Daflon, S.</au><au>Almeida-Fernandes, F.</au><au>Souto, Diogo</au><au>Majewski, S. R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Abundance Pattern of α Elements in the Triangulum–Andromeda Overdensity</atitle><jtitle>The Astrophysical journal</jtitle><date>2020-09-01</date><risdate>2020</risdate><volume>901</volume><issue>1</issue><spage>27</spage><pages>27-</pages><issn>0004-637X</issn><eissn>1538-4357</eissn><abstract>The close relationship between the nature of the Triangulum–Andromeda (TriAnd) overdensity and the Galactic disk has become increasingly evident in recent years. However, the chemical pattern of this overdensity (
R
GC
= 20–30 kpc) is unique and differs from what we know of the local disk. In this study, we analyze the chemical abundances of five
α
elements (Mg, O, Si, Ca, and Ti) in a sample of stars belonging to the TriAnd overdensity, including stars with [Fe/H] < −1.2, to investigate the evolution of the
α
elements with metallicity. High-resolution spectra from Gemini North with GRACES were analyzed. Overall, the TriAnd population presents an
α
-element pattern that differs from that of the local disk; the TriAnd stars fall in between the local disk and the dwarf galaxies in the [X/Fe] versus [Fe/H] plane. The high [Mg/Fe] ratios obtained for the lower metallicity TriAnd stars may indicate a roughly parallel sequence to the Milky Way local disk at lower values of [Fe/H], revealing a
knee
shifted toward lower metallicities for the TriAnd population. Similar behavior is also exhibited in the [Ca/Fe] and [Si/Fe] ratios. However, for O and Ti the behavior of the [X/Fe] ratios shows a slight decay with decreasing metallicity. Our results reinforce the TriAnd overdensity as a unique stellar population of the Milky Way, with an abundance pattern that is different from all stellar populations studied to date. The complete understanding of the complex TriAnd population will require high-resolution spectroscopic observations of a larger sample of TriAnd stars.</abstract><cop>Philadelphia</cop><pub>IOP Publishing</pub><doi>10.3847/1538-4357/abaaad</doi><orcidid>https://orcid.org/0000-0003-0636-7463</orcidid><orcidid>https://orcid.org/0000-0002-0537-4146</orcidid><orcidid>https://orcid.org/0000-0002-5274-4955</orcidid><orcidid>https://orcid.org/0000-0003-2025-3147</orcidid><orcidid>https://orcid.org/0000-0001-6476-0576</orcidid><orcidid>https://orcid.org/0000-0002-7883-5425</orcidid><oa>free_for_read</oa></addata></record> |
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| source | IOP Publishing Free Content; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection |
| subjects | Abundance Andromeda Galaxy Astrophysics Calcium Dwarf galaxies Galactic disk High resolution Iron Magnesium Metallicity Milky Way Silicon Stellar evolution Stellar populations Titanium |
| title | The Abundance Pattern of α Elements in the Triangulum–Andromeda Overdensity |
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