The diameter and evolutionary state of Procyon A. Multi-technique modeling using asteroseismic and interferometric constraints
TLDR
In this paper, the angular diameter of Procyon A (aCMiA, F5IV-V) was measured with the VINCI/VLTI instrument with a relative precision of 0.9% using the CESAM code.Abstract:
We report the angular diameter measurement obtained with the VINCI/VLTI instrument on the nearby star Procyon A (aCMiA, F5IV-V), at a relative precision of ′0.9% We obtain a uniform disk angular diameter in the K band of θ U D = 5.376 ′ 0.047 mas and a limb darkened value of θ L D = 5.448 ′ 0.053 mas. Together with the HIPPARCOS parallax, this gives a linear diameter of 2.048 ′ 0.025 D O .. We use this result in combination with spectroscopic, photometric and asteroseismic constraints to model this star with the CESAM code. One set of modeling parameters that reproduces the observations within their error bars are an age of 2314 Myr, an initial helium mass fraction Y i = 0.301 and an initial mass ratio of heavy elements to hydrogen (Z/X) i = 0.0314. We also computed the adiabatic oscillation spectrum of our model of Procyon A, giving a mean large frequency separation of Δv 0 54.7 μHz. This value is in agreement with the seismic observations by Martic et al. (1999, 2001). The interferometric diameter and the asteroseismic large frequency spacing together suggest a mass closer to 1.4 M O . than to 1.5 M O .. We conclude that Procyon is currently ending its life on the main sequence, as its luminosity class indicates.read more
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Spectroscopic properties of cool stars (spocs). i. 1040 f, g, and k dwarfs from keck, lick, and aat planet search programs
Jeff A. Valenti,Debra A. Fischer +1 more
TL;DR: In this article, the authors presented a catalog of stellar properties for 1040 nearby F, G, and K stars that have been observed by the Keck, Lick, and AAT planet search programs.
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The angular sizes of dwarf stars and subgiants Surface brightness relations calibrated by interferometry
TL;DR: In this article, the smallest intrinsic dispersions of σ ≤ 1% in θ LD are obtained for the surface brightness relations of these stars using exclusively direct angular diameter measurements.
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Nearby stars of the Galactic disc and halo – V
TL;DR: In this paper, a volume-complete sample of about 300 nearby F-, G-, and K-type stars was used to provide an unbiased record of the local stellar populations and the much younger thin disc.
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Stellar Lyα Emission Lines in the Hubble Space Telescope Archive: Intrinsic Line Fluxes and Absorption from the Heliosphere and Astrospheres*
Brian E. Wood,Seth Redfield,Jeffrey L. Linsky,Hans-Reinhard Müller,Hans-Reinhard Müller,Gary P. Zank +5 more
TL;DR: In this paper, the authors search the Hubble Space Telescope (HST) archive for previously unanalyzed observations of stellar H I Lyα emission lines, their primary purpose being to look for new detections of Lyα absorption from the outer heliosphere and to also search for analogous absorption of the astrospheres surrounding the observed stars.
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Accurate fundamental parameters for 23 bright solar-type stars
Hans Bruntt,Timothy R. Bedding,P.-O. Quirion,P.-O. Quirion,G. Lo Curto,Fabien Carrier,Barry Smalley,T. H. Dall,T. Arentoft,Michael Bazot,R. P. Butler +10 more
TL;DR: In this paper, the authors 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.
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