Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window
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 th...
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6253012017-08-24T03:00:40Z 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 Smith, Verne V. Hasselquist, Sten Souto, Diogo Shetrone, Matthew D. Allende Prieto, Carlos Bizyaev, Dmitry Frinchaboy, Peter García-Hernández, D. Anibal Holtzman, Jon Johnson, Jennifer A. Jőnsson, Henrik Majewski, Steven R. Mészáros, Szabolcs Nidever, David Pinsonneault, Mark Schiavon, Ricardo P. Sobeck, Jennifer Skrutskie, Michael F. Zamora, Olga Zasowski, Gail Fernández-Trincado, J. G. Univ Arizona stars: abundances 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. 2017-08-01 Article Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window 2017, 844 (2):145 The Astrophysical Journal 1538-4357 10.3847/1538-4357/aa7beb http://hdl.handle.net/10150/625301 http://arizona.openrepository.com/arizona/handle/10150/625301 The Astrophysical Journal en http://stacks.iop.org/0004-637X/844/i=2/a=145?key=crossref.7f93d9795cec3f52b6542fe8c4746f83 © 2017. The American Astronomical Society. All rights reserved. IOP PUBLISHING LTD |
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language |
en |
sources |
NDLTD |
topic |
stars: abundances |
spellingShingle |
stars: abundances Cunha, Katia Smith, Verne V. Hasselquist, Sten Souto, Diogo Shetrone, Matthew D. Allende Prieto, Carlos Bizyaev, Dmitry Frinchaboy, Peter García-Hernández, D. Anibal Holtzman, Jon Johnson, Jennifer A. Jőnsson, Henrik Majewski, Steven R. Mészáros, Szabolcs Nidever, David Pinsonneault, Mark Schiavon, Ricardo P. Sobeck, Jennifer Skrutskie, Michael F. Zamora, Olga Zasowski, Gail Fernández-Trincado, J. G. Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
description |
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. |
author2 |
Univ Arizona |
author_facet |
Univ Arizona Cunha, Katia Smith, Verne V. Hasselquist, Sten Souto, Diogo Shetrone, Matthew D. Allende Prieto, Carlos Bizyaev, Dmitry Frinchaboy, Peter García-Hernández, D. Anibal Holtzman, Jon Johnson, Jennifer A. Jőnsson, Henrik Majewski, Steven R. Mészáros, Szabolcs Nidever, David Pinsonneault, Mark Schiavon, Ricardo P. Sobeck, Jennifer Skrutskie, Michael F. Zamora, Olga Zasowski, Gail Fernández-Trincado, J. G. |
author |
Cunha, Katia Smith, Verne V. Hasselquist, Sten Souto, Diogo Shetrone, Matthew D. Allende Prieto, Carlos Bizyaev, Dmitry Frinchaboy, Peter García-Hernández, D. Anibal Holtzman, Jon Johnson, Jennifer A. Jőnsson, Henrik Majewski, Steven R. Mészáros, Szabolcs Nidever, David Pinsonneault, Mark Schiavon, Ricardo P. Sobeck, Jennifer Skrutskie, Michael F. Zamora, Olga Zasowski, Gail Fernández-Trincado, J. G. |
author_sort |
Cunha, Katia |
title |
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
title_short |
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
title_full |
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
title_fullStr |
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
title_full_unstemmed |
Adding the s-Process Element Cerium to the APOGEE Survey: Identification and Characterization of Ce ii Lines in the H-band Spectral Window |
title_sort |
adding the s-process element cerium to the apogee survey: identification and characterization of ce ii lines in the h-band spectral window |
publisher |
IOP PUBLISHING LTD |
publishDate |
2017 |
url |
http://hdl.handle.net/10150/625301 http://arizona.openrepository.com/arizona/handle/10150/625301 |
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