The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO

C. C. Worley; P. Jofre; B. Rendle; A. Miglio; L. Magrini; D. Feuillet; A. Gavel; R. Smiljanic; K. Lind; A. Korn; G. Gilmore; S. Randich; A. Hourihane; A. Gonneau; P. Francois; J. Lewis; G. Sacco; A. Bragaglia; U. Heiter; S. Feltzing; T. Bensby; M. Irwin; E. Gonzalez Solares; D. Murphy; A. Bayo; L. Sbordone; T. Zwitter; A. C. Lanzafame; N. Walton; S. Zaggia; E. J. Alfaro; L. Morbidelli; S. Sousa; L. Monaco; G. Carraro; C. Lardo

doi:10.1051/0004-6361/201936726

The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO

C. C. Worley, P. Jofre, B. Rendle, A. Miglio, L. Magrini, D. Feuillet, A. Gavel, R. Smiljanic, K. Lind, A. Korn, G. Gilmore, S. Randich, A. Hourihane, A. Gonneau, P. Francois, J. Lewis, G. Sacco, A. Bragaglia, U. Heiter, S. FeltzingT. Bensby, M. Irwin, E. Gonzalez Solares, D. Murphy, A. Bayo, L. Sbordone, T. Zwitter, A. C. Lanzafame, N. Walton, S. Zaggia, E. J. Alfaro, L. Morbidelli, S. Sousa, L. Monaco, G. Carraro, C. Lardo

Physics and Astronomy

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Abstract

The extensive stellar spectroscopic datasets that are available for studies in Galactic Archeaology thanks to, for example, the Gaia-ESO Survey, now benefit from having a significant number of targets that overlap with asteroseismology projects such as Kepler, K2 and CoRoT. Combining the measurements from spectroscopy and asteroseismology allows us to attain greater accuracy with regard to the stellar parameters needed to characterise the stellar populations of the Milky Way. The aim of this Gaia-ESO Survey special project is to produce a catalogue of self-consistent stellar parameters by combining measurements from high-resolution spectroscopy and precision asteroseismology. We carried out an iterative analysis of 90 K2@Gaia-ESO red giants. The spectroscopic values of Teff were used as input in the seismic analysis to obtain log(g) values. The seismic estimates of log(g) were then used to re-determine the spectroscopic values of Teff and [Fe/H]. Only one iteration was required to obtain parameters that are in good agreement for both methods and thus, to obtain the final stellar parameters. A detailed analysis of outliers was carried out to ensure a robust determination of the parameters. The results were then combined with Gaia DR2 data to compare the seismic log(g) with a parallax-based log(g) and to investigate instances of variations in the velocity and possible binaries within the dataset. This analysis produced a high-quality catalogue of stellar parameters for 90 red giant stars observed by both K2 and Gaia-ESO that were determined through iterations between spectroscopy and asteroseismology. We compared the seismic gravities with those based on Gaia parallaxes to find an offset which is similar to other studies that have used asteroseismology. Our catalogue also includes spectroscopic chemical abundances and radial velocities, as well as indicators for possible binary detections.

Original language	English
Journal	A&A
Volume	643
Issue number	A83
DOIs	https://doi.org/10.1051/0004-6361/201936726
Publication status	Published - 20 Jul 2020

Bibliographical note

33 pages, 26 figures

Keywords

astro-ph.SR
astro-ph.GA

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10.1051/0004-6361/201936726

Cite this

Worley, C. C., Jofre, P., Rendle, B., Miglio, A., Magrini, L., Feuillet, D., Gavel, A., Smiljanic, R., Lind, K., Korn, A., Gilmore, G., Randich, S., Hourihane, A., Gonneau, A., Francois, P., Lewis, J., Sacco, G., Bragaglia, A., Heiter, U., ... Lardo, C. (2020). The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO. A&A, 643(A83). https://doi.org/10.1051/0004-6361/201936726

@article{26f4540297f84667bdc57fbb5a918d3a,

title = "The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO",

abstract = " The extensive stellar spectroscopic datasets that are available for studies in Galactic Archeaology thanks to, for example, the Gaia-ESO Survey, now benefit from having a significant number of targets that overlap with asteroseismology projects such as Kepler, K2 and CoRoT. Combining the measurements from spectroscopy and asteroseismology allows us to attain greater accuracy with regard to the stellar parameters needed to characterise the stellar populations of the Milky Way. The aim of this Gaia-ESO Survey special project is to produce a catalogue of self-consistent stellar parameters by combining measurements from high-resolution spectroscopy and precision asteroseismology. We carried out an iterative analysis of 90 K2@Gaia-ESO red giants. The spectroscopic values of Teff were used as input in the seismic analysis to obtain log(g) values. The seismic estimates of log(g) were then used to re-determine the spectroscopic values of Teff and [Fe/H]. Only one iteration was required to obtain parameters that are in good agreement for both methods and thus, to obtain the final stellar parameters. A detailed analysis of outliers was carried out to ensure a robust determination of the parameters. The results were then combined with Gaia DR2 data to compare the seismic log(g) with a parallax-based log(g) and to investigate instances of variations in the velocity and possible binaries within the dataset. This analysis produced a high-quality catalogue of stellar parameters for 90 red giant stars observed by both K2 and Gaia-ESO that were determined through iterations between spectroscopy and asteroseismology. We compared the seismic gravities with those based on Gaia parallaxes to find an offset which is similar to other studies that have used asteroseismology. Our catalogue also includes spectroscopic chemical abundances and radial velocities, as well as indicators for possible binary detections. ",

keywords = "astro-ph.SR, astro-ph.GA",

author = "Worley, {C. C.} and P. Jofre and B. Rendle and A. Miglio and L. Magrini and D. Feuillet and A. Gavel and R. Smiljanic and K. Lind and A. Korn and G. Gilmore and S. Randich and A. Hourihane and A. Gonneau and P. Francois and J. Lewis and G. Sacco and A. Bragaglia and U. Heiter and S. Feltzing and T. Bensby and M. Irwin and Solares, {E. Gonzalez} and D. Murphy and A. Bayo and L. Sbordone and T. Zwitter and Lanzafame, {A. C.} and N. Walton and S. Zaggia and Alfaro, {E. J.} and L. Morbidelli and S. Sousa and L. Monaco and G. Carraro and C. Lardo",

note = "33 pages, 26 figures",

year = "2020",

month = jul,

day = "20",

doi = "10.1051/0004-6361/201936726",

language = "English",

volume = "643",

journal = "A&A",

number = "A83",

}

Worley, CC, Jofre, P, Rendle, B, Miglio, A, Magrini, L, Feuillet, D, Gavel, A, Smiljanic, R, Lind, K, Korn, A, Gilmore, G, Randich, S, Hourihane, A, Gonneau, A, Francois, P, Lewis, J, Sacco, G, Bragaglia, A, Heiter, U, Feltzing, S, Bensby, T, Irwin, M, Solares, EG, Murphy, D, Bayo, A, Sbordone, L, Zwitter, T, Lanzafame, AC, Walton, N, Zaggia, S, Alfaro, EJ, Morbidelli, L, Sousa, S, Monaco, L, Carraro, G & Lardo, C 2020, 'The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO', A&A, vol. 643, no. A83. https://doi.org/10.1051/0004-6361/201936726

TY - JOUR

T1 - The Gaia-ESO Survey

T2 - Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO

AU - Worley, C. C.

AU - Jofre, P.

AU - Rendle, B.

AU - Miglio, A.

AU - Magrini, L.

AU - Feuillet, D.

AU - Gavel, A.

AU - Smiljanic, R.

AU - Lind, K.

AU - Korn, A.

AU - Gilmore, G.

AU - Randich, S.

AU - Hourihane, A.

AU - Gonneau, A.

AU - Francois, P.

AU - Lewis, J.

AU - Sacco, G.

AU - Bragaglia, A.

AU - Heiter, U.

AU - Feltzing, S.

AU - Bensby, T.

AU - Irwin, M.

AU - Solares, E. Gonzalez

AU - Murphy, D.

AU - Bayo, A.

AU - Sbordone, L.

AU - Zwitter, T.

AU - Lanzafame, A. C.

AU - Walton, N.

AU - Zaggia, S.

AU - Alfaro, E. J.

AU - Morbidelli, L.

AU - Sousa, S.

AU - Monaco, L.

AU - Carraro, G.

AU - Lardo, C.

N1 - 33 pages, 26 figures

PY - 2020/7/20

Y1 - 2020/7/20

N2 - The extensive stellar spectroscopic datasets that are available for studies in Galactic Archeaology thanks to, for example, the Gaia-ESO Survey, now benefit from having a significant number of targets that overlap with asteroseismology projects such as Kepler, K2 and CoRoT. Combining the measurements from spectroscopy and asteroseismology allows us to attain greater accuracy with regard to the stellar parameters needed to characterise the stellar populations of the Milky Way. The aim of this Gaia-ESO Survey special project is to produce a catalogue of self-consistent stellar parameters by combining measurements from high-resolution spectroscopy and precision asteroseismology. We carried out an iterative analysis of 90 K2@Gaia-ESO red giants. The spectroscopic values of Teff were used as input in the seismic analysis to obtain log(g) values. The seismic estimates of log(g) were then used to re-determine the spectroscopic values of Teff and [Fe/H]. Only one iteration was required to obtain parameters that are in good agreement for both methods and thus, to obtain the final stellar parameters. A detailed analysis of outliers was carried out to ensure a robust determination of the parameters. The results were then combined with Gaia DR2 data to compare the seismic log(g) with a parallax-based log(g) and to investigate instances of variations in the velocity and possible binaries within the dataset. This analysis produced a high-quality catalogue of stellar parameters for 90 red giant stars observed by both K2 and Gaia-ESO that were determined through iterations between spectroscopy and asteroseismology. We compared the seismic gravities with those based on Gaia parallaxes to find an offset which is similar to other studies that have used asteroseismology. Our catalogue also includes spectroscopic chemical abundances and radial velocities, as well as indicators for possible binary detections.

AB - The extensive stellar spectroscopic datasets that are available for studies in Galactic Archeaology thanks to, for example, the Gaia-ESO Survey, now benefit from having a significant number of targets that overlap with asteroseismology projects such as Kepler, K2 and CoRoT. Combining the measurements from spectroscopy and asteroseismology allows us to attain greater accuracy with regard to the stellar parameters needed to characterise the stellar populations of the Milky Way. The aim of this Gaia-ESO Survey special project is to produce a catalogue of self-consistent stellar parameters by combining measurements from high-resolution spectroscopy and precision asteroseismology. We carried out an iterative analysis of 90 K2@Gaia-ESO red giants. The spectroscopic values of Teff were used as input in the seismic analysis to obtain log(g) values. The seismic estimates of log(g) were then used to re-determine the spectroscopic values of Teff and [Fe/H]. Only one iteration was required to obtain parameters that are in good agreement for both methods and thus, to obtain the final stellar parameters. A detailed analysis of outliers was carried out to ensure a robust determination of the parameters. The results were then combined with Gaia DR2 data to compare the seismic log(g) with a parallax-based log(g) and to investigate instances of variations in the velocity and possible binaries within the dataset. This analysis produced a high-quality catalogue of stellar parameters for 90 red giant stars observed by both K2 and Gaia-ESO that were determined through iterations between spectroscopy and asteroseismology. We compared the seismic gravities with those based on Gaia parallaxes to find an offset which is similar to other studies that have used asteroseismology. Our catalogue also includes spectroscopic chemical abundances and radial velocities, as well as indicators for possible binary detections.

KW - astro-ph.SR

KW - astro-ph.GA

U2 - 10.1051/0004-6361/201936726

DO - 10.1051/0004-6361/201936726

M3 - Article

VL - 643

JO - A&A

JF - A&A

IS - A83

ER -

The Gaia-ESO Survey: Spectroscopic-asteroseismic analysis of K2 stars in Gaia-ESO

Abstract

Bibliographical note

Keywords

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