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Adding the s-Process Element Cerium to the APOGEE Survey : Identification and Characterization of Ce II Lines in the H-band Spectral Window

Cunha, Katia (författare)
Univ Arizona, Tucson, AZ 85719 USA.;Observ Nacl, Rio De Janeiro, Brazil.
Smith, Verne V. (författare)
Natl Opt Astron Observ, Tucson, AZ 85719 USA.
Hasselquist, Sten (författare)
New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.
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Souto, Diogo (författare)
Observ Nacl, Rio De Janeiro, Brazil.
Shetrone, Matthew D. (författare)
Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA.;Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA.
Allende Prieto, Carlos (författare)
Inst Astrofis Canarias, Tenerife 38200, Spain.;Univ La Laguna, Dept Astrofis, Tenerife 38200, Spain.
Bizyaev, Dmitry (författare)
Apache Point Observ, Sunspot, NM 88349 USA.;Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia.
Frinchaboy, Peter (författare)
Texas Christian Univ, Dallas, TX USA.
Anibal Garcia-Hernandez, D. (författare)
Inst Astrofis Canarias, Tenerife 38200, Spain.;Univ La Laguna, Dept Astrofis, Tenerife 38200, Spain.
Holtzman, Jon (författare)
New Mexico State Univ, Dept Astron, Las Cruces, NM 88003 USA.
Johnson, Jennifer A. (författare)
Ohio State Univ, Dept Astron, 174 W 18th Ave, Columbus, OH 43210 USA.
Jönsson, Henrik (författare)
Inst Astrofis Canarias, Tenerife 38200, Spain.;Univ La Laguna, Dept Astrofis, Tenerife 38200, Spain.
Majewski, Steven R. (författare)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Meszaros, Szabolcs (författare)
ELTE Gothard Astrophys Observ, Szent Imre Herceg St 112, H-9700 Szombathely, Hungary.;Hungarian Acad Sci, Budapest, Hungary.
Nidever, David (författare)
Natl Opt Astron Observ, Tucson, AZ 85719 USA.
Pinsonneault, Mark (författare)
Ohio State Univ, Dept Astron, 174 W 18th Ave, Columbus, OH 43210 USA.
Schiavon, Ricardo P. (författare)
Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England.
Sobeck, Jennifer (författare)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Skrutskie, Michael F. (författare)
Dept Astron, POB 400325,530 McCormick Rd, Charlottesville, VA 22904 USA.
Zamora, Olga (författare)
Inst Astrofis Canarias, Tenerife 38200, Spain.;Univ La Laguna, Dept Astrofis, Tenerife 38200, Spain.
Zasowski, Gail (författare)
STScI, Baltimore, MD 21218 USA.;Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
Fernandez-Trincado, J. G. (författare)
Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile.
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Univ Arizona, Tucson, AZ 85719 USA;Observ Nacl, Rio De Janeiro, Brazil. Natl Opt Astron Observ, Tucson, AZ 85719 USA. (creator_code:org_t)
2017-08-01
2017
Engelska.
Ingår i: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 844:2
Relaterad länk:
https://doi.org/10.3...
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https://repository.a...
https://urn.kb.se/re...
https://doi.org/10.3...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Nine Ce II lines have been identified and characterized within the spectral window observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey (between lambda 1.51 and 1.69 mu m). At solar metallicities, cerium is an element that is produced predominantly as a result of the slow capture of neutrons (the s-process) during asymptotic giant branch stellar evolution. The Ce II lines were identified using a combination of a high-resolution (R = lambda/delta lambda = 100,000) Fourier Transform Spectrometer (FTS) spectrum of a Boo and an APOGEE spectrum (R. =. 22,400) of a metal-poor, but s-process enriched, red giant (2M16011638-1201525). Laboratory oscillator strengths are not available for these lines. Astrophysical gf-values were derived using alpha Boo as a standard star, with the absolute cerium abundance in alpha Boo set by using optical Ce II lines that have precise published laboratory gf-values. The near-infrared Ce II lines identified here are also analyzed, as consistency checks, in a small number of bright red giants using archival FTS spectra, as well as a small sample of APOGEE red giants, including two members of the open cluster NGC 6819, two field stars, and seven metal-poor N-and Al-rich stars. The conclusion is that this set of Ce II lines can be detected and analyzed in a large fraction of the APOGEE red giant sample and will be useful for probing chemical evolution of the s-process products in various populations of the Milky Way.

Ämnesord

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

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stars: abundances

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