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The Photometric Met...
The Photometric Metallicity and Carbon Distributions of the Milky Way's Halo and Solar Neighborhood from S-PLUS Observations of SDSS Stripe 82
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Whitten, Devin D. (författare)
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Placco, Vinicius M. (författare)
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Beers, Timothy C. (författare)
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An, Deokkeun (författare)
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Lee, Young Sun (författare)
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Almeida-Fernandes, Felipe (författare)
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Herpich, Fábio R. (författare)
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Daflon, Simone (författare)
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Barbosa, Carlos E. (författare)
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Perottoni, Hélio D. (författare)
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Rossi, Silvia (författare)
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Tissera, Patricia B. (författare)
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Yoon, Jinmi (författare)
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- Youakim, Kris (författare)
- Stockholms universitet,Institutionen för astronomi,Leibniz-Institut für Astrophysik Potsdam, Germany
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Schoenell, William (författare)
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Ribeiro, Tiago (författare)
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Kanaan, Antonio (författare)
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(creator_code:org_t)
- 2021-05-14
- 2021
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 0004-637X .- 1538-4357. ; 912:2
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- We report photometric estimates of effective temperature, T (eff), metallicity, [Fe/H], carbonicity, [C/Fe], and absolute carbon abundances, A(C), for over 700,000 stars from the Southern Photometric Local Universe Survey (S-PLUS) Data Release 2, covering a substantial fraction of the equatorial Sloan Digital Sky Survey Stripe 82. We present an analysis for two stellar populations: (1) halo main-sequence turnoff stars and (2) K-dwarf stars of mass 0.58 < M/M (circle dot) < 0.75 in the Solar Neighborhood. Application of the Stellar Photometric Index Network Explorer (SPHINX) to the mixed-bandwidth (narrow- plus wide-band) filter photometry from S-PLUS produces robust estimates of the metallicities and carbon abundances in stellar atmospheres over a wide range of temperatures, 4250 < T (eff)(K) < 7000. The use of multiple narrow-band S-PLUS filters enables SPHINX to achieve substantially lower levels of catastrophic failures (i.e., large offsets in metallicity estimates relative to spectroscopic determinations) than previous efforts using a single metallicity-sensitive narrow-band filter. We constrain the exponential slope of the Milky Way's K-dwarf halo metallicity distribution function (MDF), lambda (10,[Fe/H]) = 0.85 +/- 0.21, over the metallicity range -2.5 < [Fe/H] < -1.0; the MDF of our local-volume K-dwarf sample is well-represented by a gamma distribution with parameters alpha = 2.8 and beta = 4.2. S-PLUS photometry obtains absolute carbon abundances with a precision of similar to 0.35 dex for stars with T (eff) < 6500 K. We identify 364 candidate carbon-enhanced metal-poor stars, obtain assignments of these stars into the Yoon-Beers morphological groups in the A(C)-[Fe/H] space, and we derive the CEMP frequencies.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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Till lärosätets databas
- Av författaren/redakt...
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Whitten, Devin D ...
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Placco, Vinicius ...
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Beers, Timothy C ...
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An, Deokkeun
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Lee, Young Sun
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Almeida-Fernande ...
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visa fler...
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Herpich, Fábio R ...
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Daflon, Simone
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Barbosa, Carlos ...
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Perottoni, Hélio ...
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Rossi, Silvia
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Tissera, Patrici ...
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Yoon, Jinmi
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Youakim, Kris
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Schoenell, Willi ...
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Ribeiro, Tiago
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Kanaan, Antonio
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visa färre...
- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Fysik
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Astrophysical Jo ...
- Av lärosätet
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Stockholms universitet