main sequence
Direct determination of physical parameters for main sequence stars
... Direct determination of physical parameters for main sequence stars M. Rabus 1 , R. Lachaume 1,2 , R. Brahm 1 , A. Jordan 1 , J.-B. Le Bouquin 3 , J.-P. Berger 4 , O. Absil 5 , T. Boyajian 6 , G. Duvert 3 ...
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RS Cha, a binary system suitable for testing stellar physics modeling during the pre-main sequence phase.
... Fig. 1 shows evolutionary tracks of PMS phase, plotted in a HR diagram, for different values of masses. Each evolution is initialised with a homogeneous, fully convective model in quasi-static contraction. We stopped the ...
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Amplitudes and lifetimes of solar-like oscillations observed by CoRoT. Red-giant versus main-sequence stars
... the main-sequence stars are all below this scaling law, which is also illustrated by the di fference of a factor of two when compar- ing the exponents computed for each group of ...
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Calibration of the Pre-Main Sequence Binary System RS Cha: Impact of the Initial Chemical Mixture
... pre-main sequence stage of evolution: masses, radii, luminosities and effective temperatures of each component and metallicity of the ...pre-main sequence stellar models representing the ...
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Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey
... 2. Observations and data reduction The choice of the Exozodi stellar sample was driven by the goal to assess possible correlations between the presence of cold and hot dust around main sequence stars ( ...
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Using seismic inversions to obtain an indicator of internal mixing processes in main-sequence solar-like stars
... Aims. We wish to build a new indicator for core conditions (i.e. mixing processes and evolutionary stage) on the main sequence. This indicator t u should be more sensitive to structural differences and ...
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Constraining the Exozodiacal Luminosity Function of Main-sequence Stars: Complete Results from the Keck Nuller Mid-infrared Surveys
... 6. CONCLUSIONS A total of 47 stars have been surveyed by the KIN between 2008 and 2011, including 40 stars with no known companion within the instrument FOV. The overall data have been reduced in a common manner, ...
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Searching for gas giant planets on Solar system scales - a NACO/APP L'-band survey of A- and F-type main-sequence stars
... A B S T R A C T We report the results of a direct imaging survey of A- and F-type main-sequence stars search- ing for giant planets. A/F stars are often the targets of surveys, as they are thought to have ...
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FliPer: A global measure of power density to estimate surface gravities of main-sequence solar-like stars and red giants
... stars in which acoustic modes excited by turbulent convection are measured. Other methods such as the Flicker technique can also be used to determine stellar surface gravities, but only works for log g above 2.5 dex. In ...
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Studying the Magnetic Properties of Upper Main-sequence Stars with FORS1
... with age and X-ray emission as expected from the decay of a remnant dynamo (Hubrig et al., 2009, A&A submitted). Dur- ing our two-night observing run in May 2008 we were able to obtain circular polarisation data for ...
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Theoretical seismic properties of pre-main sequence γ Doradus pulsators
... The observational γ Dor IS covers a part of the Hertzsprung-Russel diagram (HRD) between 7200–7700 K on the zero-age main sequence (ZAMS) and 6900–7500 K above it ( Handler 1999 ), between the solar-like ...
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Calibration of the pre-main sequence RS Chamaleontis binary system
... pre-main sequence – stars: binaries: eclipsing – stars: oscillations stars: evolution – stars: interiors – stars: individual: RS chamaleons ...of main sequence (MS) stellar evolution models ...
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Stochastic excitation of gravity modes in massive main-sequence stars
... Main-sequence stars significantly more massive than the Sun are potentially interesting for seeking stochastically- excited modes. Indeed, stochastically-excited p modes have recently been detected in a ...
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Chemical Abundance Signature of J0023+0307: A Second-generation Main-sequence Star with [Fe/H]
... Abstract We present a chemical abundance analysis of the faint halo metal-poor main-sequence star J0023 +0307, with [Fe/H]<−6.3, based on a high-resolution (R∼35,000) Magellan/MIKE spectrum. The star ...
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The stars of the low part of the main sequence
... In the cadre of the program of determination by a uniform technique of parameters and a chemical composition for the extensive sample of stars we represent the investigation of 133 stars of the low part of the ...
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Theoretical Predictions of Surface Light Element Abundances in Protostellar and Pre-Main Sequence Phase
... pre-Main Sequence characteristics and thus the light element ...pre-Main Sequence stars and their light element surface abundances, discussing the role of (p, α) nuclear reaction rates and ...
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Two new SB2 binaries with main sequence B-type pulsators in the Kepler field
... of main sequence B-type stars by means of more than three years of Kepler space photometry and high-resolution ground based ...the main sequence, with an orbital period of ...unevolved ...
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The Struve-Sahade effect in the optical spectra of O-type binaries - I. Main-sequence systems
... r.m.s. (km s − 1 ) 6.2 to an O6 spectral type for the primary and O6.5 for the sec- ondary. The uncertainties on these numbers (at least partially due to the S-S effect, see Sect. 2.3) correspond to a range for the ...
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Early- and late-stage mergers among main sequence and starburst galaxies at 0.2 ≤ z ≤ 2
... To quantify the level of completeness of our selection criteria and how this depends on the mass ratio of the merging galaxies, we also generated artificial mergers by selecting a random[r] ...
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Binaries at the Bottom of the Main Sequence and below
... L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignemen[r] ...
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