Accurate fundamental parameters for 23 bright solar-type stars

H. Bruntt, T. R. Bedding, P. O. Quirion, G. Lo Curto, F. Carrier, B. Smalley, T. H. Dall, T. Arentoft, Michael Bazot, R. P. Butler

Research output: Contribution to journalArticle

Abstract

We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 and luminosity classes III-V. For some stars we can use direct techniques to determine the mass, radius, luminosity and effective temperature, and we compare with indirect methods that rely on photometric calibrations or spectroscopic analyses. We use the asteroseismic information available in the literature to infer an indirect mass with an accuracy of 4-15 per cent. From indirect methods we determine luminosity and radius to 3 per cent. We find evidence that the luminosity from the indirect method is slightly overestimated (≈ 5 per cent) for the coolest stars, indicating that their bolometric corrections (BCs) are too negative. For Teff we find a slight offset of -40 ± 20 K between the spectroscopic method and the direct method, meaning the spectroscopic temperatures are too high. From the spectroscopic analysis we determine the detailed chemical composition for 13 elements, including Li, C and O. The metallicity ranges from [Fe/H]=-1.7 to +0.4, and there is clear evidence for α-element enhancement in the metal-poor stars. We find no significant offset between the spectroscopic surface gravity and the value from combining asteroseismology with radius estimates. From the spectroscopy we also determine v sin i and we present a new calibration of macroturbulence and microturbulence. From the comparison between the results from the direct and spectroscopic methods we claim that we can determine Teff, log and [Fe/H] with absolute accuracies of 80 K, 0.08 and 0.07 dex. Photometric calibrations of Strömgren indices provide accurate results for Teff and [Fe/H] but will be more uncertain for distant stars when interstellar reddening becomes important. The indirect methods are important to obtain reliable estimates of the fundamental parameters of relatively faint stars when interferometry cannot be used. This paper is the first to compare direct and indirect methods for a large sample of stars, and we conclude that indirect methods are valid, although slight corrections may be needed.

Original languageEnglish (US)
Pages (from-to)1907-1923
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Volume405
Issue number3
DOIs
StatePublished - Jul 1 2010

Fingerprint

stars
luminosity
asteroseismology
radii
interferometry
calibration
interstellar extinction
cool stars
spectroscopic analysis
estimates
spectroscopy
metallicity
method
parameter
chemical composition
gravitation
temperature
augmentation
metals
gravity

Keywords

  • Stars: abundances
  • Stars: fundamental parameters
  • Stars: solar-type
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Bruntt, H., Bedding, T. R., Quirion, P. O., Lo Curto, G., Carrier, F., Smalley, B., ... Butler, R. P. (2010). Accurate fundamental parameters for 23 bright solar-type stars. Monthly Notices of the Royal Astronomical Society, 405(3), 1907-1923. https://doi.org/10.1111/j.1365-2966.2010.16575.x

Accurate fundamental parameters for 23 bright solar-type stars. / Bruntt, H.; Bedding, T. R.; Quirion, P. O.; Lo Curto, G.; Carrier, F.; Smalley, B.; Dall, T. H.; Arentoft, T.; Bazot, Michael; Butler, R. P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 405, No. 3, 01.07.2010, p. 1907-1923.

Research output: Contribution to journalArticle

Bruntt, H, Bedding, TR, Quirion, PO, Lo Curto, G, Carrier, F, Smalley, B, Dall, TH, Arentoft, T, Bazot, M & Butler, RP 2010, 'Accurate fundamental parameters for 23 bright solar-type stars', Monthly Notices of the Royal Astronomical Society, vol. 405, no. 3, pp. 1907-1923. https://doi.org/10.1111/j.1365-2966.2010.16575.x
Bruntt H, Bedding TR, Quirion PO, Lo Curto G, Carrier F, Smalley B et al. Accurate fundamental parameters for 23 bright solar-type stars. Monthly Notices of the Royal Astronomical Society. 2010 Jul 1;405(3):1907-1923. https://doi.org/10.1111/j.1365-2966.2010.16575.x
Bruntt, H. ; Bedding, T. R. ; Quirion, P. O. ; Lo Curto, G. ; Carrier, F. ; Smalley, B. ; Dall, T. H. ; Arentoft, T. ; Bazot, Michael ; Butler, R. P. / Accurate fundamental parameters for 23 bright solar-type stars. In: Monthly Notices of the Royal Astronomical Society. 2010 ; Vol. 405, No. 3. pp. 1907-1923.
@article{12d532226a2f469dba9c14c1d07369e9,
title = "Accurate fundamental parameters for 23 bright solar-type stars",
abstract = "We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 and luminosity classes III-V. For some stars we can use direct techniques to determine the mass, radius, luminosity and effective temperature, and we compare with indirect methods that rely on photometric calibrations or spectroscopic analyses. We use the asteroseismic information available in the literature to infer an indirect mass with an accuracy of 4-15 per cent. From indirect methods we determine luminosity and radius to 3 per cent. We find evidence that the luminosity from the indirect method is slightly overestimated (≈ 5 per cent) for the coolest stars, indicating that their bolometric corrections (BCs) are too negative. For Teff we find a slight offset of -40 ± 20 K between the spectroscopic method and the direct method, meaning the spectroscopic temperatures are too high. From the spectroscopic analysis we determine the detailed chemical composition for 13 elements, including Li, C and O. The metallicity ranges from [Fe/H]=-1.7 to +0.4, and there is clear evidence for α-element enhancement in the metal-poor stars. We find no significant offset between the spectroscopic surface gravity and the value from combining asteroseismology with radius estimates. From the spectroscopy we also determine v sin i and we present a new calibration of macroturbulence and microturbulence. From the comparison between the results from the direct and spectroscopic methods we claim that we can determine Teff, log and [Fe/H] with absolute accuracies of 80 K, 0.08 and 0.07 dex. Photometric calibrations of Str{\"o}mgren indices provide accurate results for Teff and [Fe/H] but will be more uncertain for distant stars when interstellar reddening becomes important. The indirect methods are important to obtain reliable estimates of the fundamental parameters of relatively faint stars when interferometry cannot be used. This paper is the first to compare direct and indirect methods for a large sample of stars, and we conclude that indirect methods are valid, although slight corrections may be needed.",
keywords = "Stars: abundances, Stars: fundamental parameters, Stars: solar-type, Techniques: spectroscopic",
author = "H. Bruntt and Bedding, {T. R.} and Quirion, {P. O.} and {Lo Curto}, G. and F. Carrier and B. Smalley and Dall, {T. H.} and T. Arentoft and Michael Bazot and Butler, {R. P.}",
year = "2010",
month = "7",
day = "1",
doi = "10.1111/j.1365-2966.2010.16575.x",
language = "English (US)",
volume = "405",
pages = "1907--1923",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

TY - JOUR

T1 - Accurate fundamental parameters for 23 bright solar-type stars

AU - Bruntt, H.

AU - Bedding, T. R.

AU - Quirion, P. O.

AU - Lo Curto, G.

AU - Carrier, F.

AU - Smalley, B.

AU - Dall, T. H.

AU - Arentoft, T.

AU - Bazot, Michael

AU - Butler, R. P.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 and luminosity classes III-V. For some stars we can use direct techniques to determine the mass, radius, luminosity and effective temperature, and we compare with indirect methods that rely on photometric calibrations or spectroscopic analyses. We use the asteroseismic information available in the literature to infer an indirect mass with an accuracy of 4-15 per cent. From indirect methods we determine luminosity and radius to 3 per cent. We find evidence that the luminosity from the indirect method is slightly overestimated (≈ 5 per cent) for the coolest stars, indicating that their bolometric corrections (BCs) are too negative. For Teff we find a slight offset of -40 ± 20 K between the spectroscopic method and the direct method, meaning the spectroscopic temperatures are too high. From the spectroscopic analysis we determine the detailed chemical composition for 13 elements, including Li, C and O. The metallicity ranges from [Fe/H]=-1.7 to +0.4, and there is clear evidence for α-element enhancement in the metal-poor stars. We find no significant offset between the spectroscopic surface gravity and the value from combining asteroseismology with radius estimates. From the spectroscopy we also determine v sin i and we present a new calibration of macroturbulence and microturbulence. From the comparison between the results from the direct and spectroscopic methods we claim that we can determine Teff, log and [Fe/H] with absolute accuracies of 80 K, 0.08 and 0.07 dex. Photometric calibrations of Strömgren indices provide accurate results for Teff and [Fe/H] but will be more uncertain for distant stars when interstellar reddening becomes important. The indirect methods are important to obtain reliable estimates of the fundamental parameters of relatively faint stars when interferometry cannot be used. This paper is the first to compare direct and indirect methods for a large sample of stars, and we conclude that indirect methods are valid, although slight corrections may be needed.

AB - We combine results from interferometry, asteroseismology and spectroscopy to determine accurate fundamental parameters of 23 bright solar-type stars, from spectral type F5 to K2 and luminosity classes III-V. For some stars we can use direct techniques to determine the mass, radius, luminosity and effective temperature, and we compare with indirect methods that rely on photometric calibrations or spectroscopic analyses. We use the asteroseismic information available in the literature to infer an indirect mass with an accuracy of 4-15 per cent. From indirect methods we determine luminosity and radius to 3 per cent. We find evidence that the luminosity from the indirect method is slightly overestimated (≈ 5 per cent) for the coolest stars, indicating that their bolometric corrections (BCs) are too negative. For Teff we find a slight offset of -40 ± 20 K between the spectroscopic method and the direct method, meaning the spectroscopic temperatures are too high. From the spectroscopic analysis we determine the detailed chemical composition for 13 elements, including Li, C and O. The metallicity ranges from [Fe/H]=-1.7 to +0.4, and there is clear evidence for α-element enhancement in the metal-poor stars. We find no significant offset between the spectroscopic surface gravity and the value from combining asteroseismology with radius estimates. From the spectroscopy we also determine v sin i and we present a new calibration of macroturbulence and microturbulence. From the comparison between the results from the direct and spectroscopic methods we claim that we can determine Teff, log and [Fe/H] with absolute accuracies of 80 K, 0.08 and 0.07 dex. Photometric calibrations of Strömgren indices provide accurate results for Teff and [Fe/H] but will be more uncertain for distant stars when interstellar reddening becomes important. The indirect methods are important to obtain reliable estimates of the fundamental parameters of relatively faint stars when interferometry cannot be used. This paper is the first to compare direct and indirect methods for a large sample of stars, and we conclude that indirect methods are valid, although slight corrections may be needed.

KW - Stars: abundances

KW - Stars: fundamental parameters

KW - Stars: solar-type

KW - Techniques: spectroscopic

UR - http://www.scopus.com/inward/record.url?scp=77954894567&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77954894567&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2010.16575.x

DO - 10.1111/j.1365-2966.2010.16575.x

M3 - Article

AN - SCOPUS:77954894567

VL - 405

SP - 1907

EP - 1923

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -