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The K2 Galactic Cap...
The K2 Galactic Caps Project - going beyond the Kepler field and ageing the Galactic disc
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- Rendle, B. M. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Miglio, A. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Chiappini, C. (author)
- Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
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- Valentini, M. (author)
- Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
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- Davies, G. R. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Mosser, B. (author)
- Univ Paris Diderot, Sorbonne Univ, PSL Res Univ, CNRS,LESIA,Observat Paris, F-92195 Meudon, France
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- Elsworth, Y. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Garcia, R. A. (author)
- Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France;Univ Paris Diderot, Univ Paris Saclay, Sorbonne Paris Cite, CNRS,AIM,CEA, F-91191 Gif Sur Yvette, France
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- Mathur, S. (author)
- Inst Astrofis Canarias, E-38200 Tenerife, Spain;Univ La Laguna, Dept Astrofis, E-38205 Tenerife, Spain;Space Sci Inst, 4750 Walnut St,Suite 205, Boulder, CO 80301 USA
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- Jofre, P. (author)
- Univ Diego Portales, Fac Ingenier & Ciencias, Nucleo Astron, Av Ejercito 441, Santiago, Chile
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- Worley, C. C. (author)
- Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
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- Casagrande, L. (author)
- Australian Natl Univ, Mt Stromlo Observ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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- Girardi, L. (author)
- Osservatorio Astron Padova INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy
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- Lund, M. N. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Feuillet, D. K. (author)
- Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- Gavel, Alvin (author)
- Uppsala universitet,Teoretisk astrofysik
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- Magrini, L. (author)
- INAF Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy
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- Khan, S. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Rodrigues, T. S. (author)
- Osservatorio Astron Padova INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy
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- Johnson, J. A. (author)
- Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA;Ohio State Univ, Ctr Cosmol & AstroParticle Phys, 191 West Woodruff Ave, Columbus, OH 43210 USA
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- Cunha, K. (author)
- Univ Arizona, Tucson, AZ 85719 USA;Observ Nacl, BR-20921400 Sao Cristovao, RJ, Brazil
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- Lane, R. L. (author)
- Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile;Millennium Inst Astrophys, Av Vicuna Mackenna, Santiago 7820436, Chile
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- Nitschelm, C. (author)
- Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile
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- Chaplin, W. J. (author)
- Univ Birmingham, Sch Phys & Astron, Edgbaston Pk Rd, Birmingham B15 2TT, W Midlands, England;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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(creator_code:org_t)
- 2019-11-04
- 2019
- English.
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In: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 490:4, s. 4465-4480
- Related links:
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https://academic.oup...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Analyses of data from spectroscopic and astrometric surveys have led to conflicting results concerning the vertical characteristics of the Milky Way. Ages are often used to provide clarity, but typical uncertainties of >40 per cent from photometry restrict the validity of the inferences made. Using the Kepler APOKASC sample for context, we explore the global population trends of two K2 campaign fields (3 and 6), which extend further vertically out of the Galactic plane than APOKASC. We analyse the properties of red giant stars utilizing three asteroseismic data analysis methods to cross-check and validate detections. The Bayesian inference tool PARAM is used to determine the stellar masses, radii, and ages. Evidence of a pronounced red giant branch bump and an [a/Fe] dependence on the position of the red clump is observed from the K2 fields radius distribution. Two peaks in the age distribution centred at similar to 5 and similar to 12 Gyr are found using a sample with sigma(age) < 35 per cent. In comparison with Kepler, we find the older peak to be more prominent for K2. This age bimodality is also observed based on a chemical selection of low-[alpha/Fe] (<= 0.1) and high-[alpha/Fe] (>0.1) stars. As a function of vertical distance from the Galactic mid-plane (|Z|), the age distribution shows a transition from a young to old stellar population with increasing |Z| for the K2 fields. Further coverage of campaign targets with high-resolution spectroscopy is required to increase the yield of precise ages achievable with asteroseismology.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- asteroseismology
- stars: late type
- Galaxy: stellar content
- structure
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Rendle, B. M.
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Miglio, A.
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Chiappini, C.
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Valentini, M.
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Davies, G. R.
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Mosser, B.
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Elsworth, Y.
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Garcia, R. A.
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Mathur, S.
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Jofre, P.
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Worley, C. C.
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Casagrande, L.
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Girardi, L.
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Lund, M. N.
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Feuillet, D. K.
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Gavel, Alvin
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Magrini, L.
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Khan, S.
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Rodrigues, T. S.
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Johnson, J. A.
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Cunha, K.
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Lane, R. L.
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Nitschelm, C.
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Chaplin, W. J.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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Monthly notices ...
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Uppsala University