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Accurate effective ...
Accurate effective temperatures of the metal-poor benchmark stars HD140283, HD122563, and HD103095 from CHARA interferometry
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- Karovicova, I. (författare)
- Heidelberg Univ, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany
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- White, T. R. (författare)
- Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
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- Nordlander, T. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, D-69117 Heidelberg, Germany
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- Casagrande, L. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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- Ireland, M. J. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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- Huber, D. (författare)
- Univ Sydney, Sch Phys, SIfA, Sydney, NSW 2006, Australia;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA;SETI Inst, 189 Bernardo Ave, Mountain View, CA 94043 USA
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- Creevey, O. (författare)
- Univ Cote Azur, OCA, Lab Lagrange, CNRS, BP 4229, F-06304 Nice, France
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- Mourard, D. (författare)
- Univ Cote Azur, OCA, Lab Lagrange, CNRS, BP 4229, F-06304 Nice, France
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- Schaefer, G. H. (författare)
- Georgia State Univ, Dept Phys & Astron, POB 5060, Atlanta, GA 30302 USA
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- Gilmore, G. (författare)
- Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England
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- Chiavassa, A. (författare)
- Univ Cote Azur, OCA, Lab Lagrange, CNRS, BP 4229, F-06304 Nice, France
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- Wittkowski, M. (författare)
- European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
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- Jofre, P. (författare)
- Univ Diego Portales, Nucleo Astron, Ave Ejercito 441, Santiago, Chile
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- Heiter, Ulrike (författare)
- Uppsala universitet,Observationell astrofysik
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- Thevenin, F. (författare)
- Univ Cote Azur, OCA, Lab Lagrange, CNRS, BP 4229, F-06304 Nice, France
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- Asplund, M. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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(creator_code:org_t)
- 2018-01-12
- 2018
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 475:1, s. L81-L85
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Abstract
Ämnesord
Stäng
- Large stellar surveys of the MilkyWay require validation with reference to a set of 'benchmark' stars whose fundamental properties are well determined. For metal-poor benchmark stars, disagreement between spectroscopic and interferometric effective temperatures has called the reliability of the temperature scale into question. We present new interferometric measurements of three metal-poor benchmark stars, HD140283, HD122563, and HD103095, from which we determine their effective temperatures. The angular sizes of all the stars were determined from observations with the PAVO beam combiner at visible wavelengths at the CHARA array, with additional observations of HD103095 made with the VEGA instrument, also at the CHARA array. Together with photometrically derived bolometric fluxes, the angular diameters give a direct measurement of the effective temperature. For HD140283, we find theta(LD) = 0.324 +/- 0.005 mas, T-eff = 5787 +/- 48 K; for HD122563,theta(LD) = 0.926 +/- 0.011 mas, T-eff = 4636 +/- 37 K; and for HD103095,theta(LD) = 0.595 +/- 0.007 mas, T-eff = 5140 +/- 49 K. Our temperatures for HD140283 and HD103095 are hotter than the previous interferometric measurements by 253 and 322 K, respectively. We find good agreement between our temperatures and recent spectroscopic and photometric estimates. We conclude some previous interferometric measurements have been affected by systematic uncertainties larger than their quoted errors.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- standards
- techniques: interferometric
- surveys
- stars: individual: HD103095
- stars: individual: HD122563
- stars: individual: HD140283
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Karovicova, I.
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White, T. R.
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Nordlander, T.
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Lind, Karin
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Casagrande, L.
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Ireland, M. J.
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visa fler...
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Huber, D.
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Creevey, O.
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Mourard, D.
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Schaefer, G. H.
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Gilmore, G.
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Chiavassa, A.
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Wittkowski, M.
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Jofre, P.
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Heiter, Ulrike
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Thevenin, F.
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Asplund, M.
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