Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. II. Atomic Diffusion in M67 Stars
(2019) In Astrophysical Journal 874(1).- Abstract
Chemical abundances for 15 elements (C, N, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are presented for 83 stellar members of the 4 Gyr old solar-metallicity open cluster M67. The sample contains stars spanning a wide range of evolutionary phases, from G dwarfs to red clump stars. The abundances were derived from near-IR (λ1.5-1.7 μm) high-resolution spectra (R ,F= ,F22,500) from the SDSS-IV/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. A 1D local thermodynamic equilibrium abundance analysis was carried out using the APOGEE synthetic spectral libraries, via χ
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Chemical abundances for 15 elements (C, N, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are presented for 83 stellar members of the 4 Gyr old solar-metallicity open cluster M67. The sample contains stars spanning a wide range of evolutionary phases, from G dwarfs to red clump stars. The abundances were derived from near-IR (λ1.5-1.7 μm) high-resolution spectra (R ,F= ,F22,500) from the SDSS-IV/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. A 1D local thermodynamic equilibrium abundance analysis was carried out using the APOGEE synthetic spectral libraries, via χ
2
minimization of the synthetic and observed spectra with the qASPCAP code. We found significant abundance differences (∼0.05-0.30 dex) between the M67 member stars as a function of the stellar mass (or position on the Hertzsprung-Russell diagram), where the abundance patterns exhibit a general depletion (in [X/H]) in stars at the main-sequence turnoff. The amount of the depletion is different for different elements. We find that atomic diffusion models provide, in general, good agreement with the abundance trends for most chemical species, supporting recent studies indicating that measurable atomic diffusion operates in M67 stars.
- author
- organization
- publishing date
- 2019-03-20
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- diffusion, infrared: stars, open clusters and associations: general, stars: abundances
- in
- Astrophysical Journal
- volume
- 874
- issue
- 1
- article number
- 97
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:85064427709
- ISSN
- 0004-637X
- DOI
- 10.3847/1538-4357/ab0b43
- language
- English
- LU publication?
- yes
- id
- 94c0c770-b2db-4823-994a-ef461c67c30b
- date added to LUP
- 2019-05-06 09:53:47
- date last changed
- 2024-04-02 01:06:02
@article{94c0c770-b2db-4823-994a-ef461c67c30b, abstract = {{<p><br> Chemical abundances for 15 elements (C, N, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are presented for 83 stellar members of the 4 Gyr old solar-metallicity open cluster M67. The sample contains stars spanning a wide range of evolutionary phases, from G dwarfs to red clump stars. The abundances were derived from near-IR (λ1.5-1.7 μm) high-resolution spectra (R ,F= ,F22,500) from the SDSS-IV/Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. A 1D local thermodynamic equilibrium abundance analysis was carried out using the APOGEE synthetic spectral libraries, via χ <br> <sup>2</sup><br> minimization of the synthetic and observed spectra with the qASPCAP code. We found significant abundance differences (∼0.05-0.30 dex) between the M67 member stars as a function of the stellar mass (or position on the Hertzsprung-Russell diagram), where the abundance patterns exhibit a general depletion (in [X/H]) in stars at the main-sequence turnoff. The amount of the depletion is different for different elements. We find that atomic diffusion models provide, in general, good agreement with the abundance trends for most chemical species, supporting recent studies indicating that measurable atomic diffusion operates in M67 stars. <br> </p>}}, author = {{Souto, Diogo and Prieto, C. Allende and Cunha, Katia and Pinsonneault, Marc and Smith, Verne V. and Garcia-Dias, R. and Bovy, Jo and Garcia-Hernández, D. A. and Holtzman, Jon and Johnson, J. A. and Jönsson, Henrik and Majewski, Steve R. and Shetrone, Matthew and Sobeck, Jennifer and Zamora, Olga and Pan, Kaike and Nitschelm, Christian}}, issn = {{0004-637X}}, keywords = {{diffusion; infrared: stars; open clusters and associations: general; stars: abundances}}, language = {{eng}}, month = {{03}}, number = {{1}}, publisher = {{American Astronomical Society}}, series = {{Astrophysical Journal}}, title = {{Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. II. Atomic Diffusion in M67 Stars}}, url = {{http://dx.doi.org/10.3847/1538-4357/ab0b43}}, doi = {{10.3847/1538-4357/ab0b43}}, volume = {{874}}, year = {{2019}}, }