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Sökning: WFRF:(Majewski S.) > (2020-2024) > Chemical abundances...

Chemical abundances of the young inner-disc open cluster NGC 6705 observed by APOGEE : sodium-rich and not α-enhanced

Loaiza-Tacuri, V. (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.
Cunha, K. (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.;Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA.;Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR7095, 98bis Bd Arago, F-75014 Paris, France.
Souto, D. (författare)
Univ Fed Sergipe, Dept Fis, Av Marechal Rondon S-N, BR-49000000 Sao Cristovao, SE, Brazil.
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Smith, V. V. (författare)
Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR7095, 98bis Bd Arago, F-75014 Paris, France.;NSFs NOIRLab, 950 N Cherry Ave, Tucson, AZ 85719 USA.
Guerco, R. (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.
Chiappini, C. (författare)
Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany.
Sales-Silva, J. V. (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.
Horta, D. (författare)
Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA.
Allende Prieto, C. (författare)
Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain.
Beaton, R. (författare)
Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA.
Bizyaev, D. (författare)
Apache Point Observ, POB 59, Sunspot, NM 88349 USA.;New Mexico State Univ, POB 59, Sunspot, NM 88349 USA.;Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119234, Russia.
Daflon, S. (författare)
Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.
Frinchaboy, P. (författare)
Texas Christian Univ, Dept Phys & Astron, TCU Box 298840, Ft Worth, TX 76129 USA.
Hasselquist, S. (författare)
Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA.
Hayes, C. R. (författare)
NRC Herzberg Astron & Astrophys Res Ctr, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada.
Holtzman, J. A. (författare)
New Mexico State Univ, Las Cruces, NM 88003 USA.
Jönsson, H. (författare)
Malmö universitet,Institutionen för materialvetenskap och tillämpad matematik (MTM)
Majewski, S. R. (författare)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Meszaros, S. (författare)
Eotvos Lorand Univ, Gothard Astrophys Observ, Szent Imre H St 112, H-9700 Szombathely, Hungary.;MTA ELTE Lendulet Momentum Milk Way Res Grp, Szombathely, Hungary.
Nidever, D. L. (författare)
Montana State Univ, Dept Phys, POB 173840, Bozeman, MT 59717 USA.
Pinsonneault, M. (författare)
Ohio State Univ, Dept Astron, Columbus, OH 43210 USA.
Zasowski, G. (författare)
Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84105 USA.
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Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil.;Univ Arizona, Steward Observ, 933 North Cherry Ave, Tucson, AZ 85721 USA.;Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR7095, 98bis Bd Arago, F-75014 Paris, France. (creator_code:org_t)
Oxford University Press, 2023
2023
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 526:2, s. 2378-2393
Relaterad länk:
https://mau.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Previous results in the literature have found the young inner-disc open cluster NGC 6705 to be mildly alpha-enhanced. We examined this possibility via an independent chemical abundance analysis for 11 red-giant members of NGC 6705. The analysis is based on near-infrared APOGEE spectra and relies on LTE calculations using spherical model atmospheres and radiative transfer. We find a mean cluster metallicity of [Fe / H] = +0.13 +/- 0.04, indicating that NGC 6705 is metal-rich, as may be expected for a young inner-disc cluster. The mean alpha-element abundance relative to iron is , which is not at odds with expectations from general Galactic abundance trends. NGC 6705 also provides important probes for studying stellar mixing, given its turn-off mass of M similar to 3.3M(circle dot). Its red giants have low C-12 abundances ([C-12/Fe] = -0.16) and enhanced N-14 abundances ([N-14/Fe] = +0.51), which are key signatures of the first dredge-up on the red giant branch. An additional signature of dredge-up was found in the Na abundances, which are enhanced by [Na/Fe] = +0.29, with a very small non-LTE correction. The O-16 and Al abundances are found to be near-solar. All of the derived mixing-sensitive abundances are in agreement with stellar models of approximately 3.3M(circle dot) evolving along the red giant branch and onto the red clump. As found in young open clusters with similar metallicities, NGC 6705 exhibits a mild excess in the s-process element cerium with [Ce/Fe] = +0.13 +/- 0.07.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

stars: abundances
infrared: stars
Galaxy: inner disc
stars: giants
stars: open cluster

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ref (ämneskategori)
art (ämneskategori)

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