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Results 1 - 10
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163
Beyond the Iron Peak: r- and s-process Elemental Abundances in Stars with Planets
, 804
"... We present elemental abundances of 118 stars (28 of which are known extrasolar planetary host stars) observed as part of the Anglo-Australian Planet Search. Abundances of O, Mg, Cr, Y, Zr, Ba, Nd and Eu (along with previously published abundances for C and Si) are presented. This study is one of the ..."
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of the first to specifically examine planetary host stars for the heavy elements produced by neutron capture reactions. We find that the host stars are chemically different to both the standard solar abundance and non-host stars in all elements studied, with enrichments over non-host stars ranging from 0
The Abundance Distribution of Stars with Planets
, 2005
"... We present the results of a uniform, high-precision spectroscopic metallicity study of 136 G-type stars from the Anglo-Australian Planet Search, 20 of which are known to harbour extrasolar planets (as at July 2005). Abundances in Fe, C, Na, Al, Si, Ca, Ti and Ni are presented, along with Strömgen p ..."
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Cited by 1 (1 self)
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photometric metallicities. This study is one of several recent studies examining the metallicities of a sample of planet-host and non-planet-host stars that were obtained from a single sample, and analysed in an identical manner, providing an unbiased estimate of the metallicity trends for planet bearing
The A-Star Puzzle
, 2004
"... Abstract. A-type supergiants are primary targets for quantitative spectroscopy of individual stars in nearby galaxies because of their intrinsic brightness. An overview is given on the non-LTE techniques required for their analysis. Applications concentrate on placing observational constraints on ev ..."
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Abstract. A-type supergiants are primary targets for quantitative spectroscopy of individual stars in nearby galaxies because of their intrinsic brightness. An overview is given on the non-LTE techniques required for their analysis. Applications concentrate on placing observational constraints
Star-Planet Interactions
, 809
"... Much effort has been invested in recent years, both observationally and theoretically, to understand the interacting processes taking place in planetary systems consisting of a hot Jupiter orbiting its star within 10 stellar radii. Several independent studies have converged on the same scenario: tha ..."
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: that a short-period planet can induce activity on the photosphere and upper atmosphere of its host star. The growing body of evidence for such magnetic star-planet interactions includes a diverse array of photometric, spectroscopic and spectropolarimetric studies. The nature of which is modeled
Structure and star formation in disk galaxies
, 2004
"... Abstract. From Hα images of a carefully selected sample of 57 relatively large, Northern spiral galaxies with low inclination, we study the distribution of the Hα emission in the circumnuclear and nuclear regions. At a resolution of around 100 parsec, we find that the nuclear Hα emission in the samp ..."
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of these results on our understanding of the occurrence and morphology of massive star formation, as well as non-stellar activity, in the central regions of galaxies are discussed.
Abundances Stratification of Exoplanet Host Stars
, 1492
"... Aims. To determineΣ(variation of Fe abundance with the optical depth),τFeI,τFeII (Rosseland median optical depth of Fe lines) and ∆[Fe/H](=[FeI/H]-[FeII/H]), in 79 Exoplanet Host stars (66 main sequence and 13 giants), with respect to 322 solar neighborhood field stars (9 main sequence and 313 giant ..."
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Aims. To determineΣ(variation of Fe abundance with the optical depth),τFeI,τFeII (Rosseland median optical depth of Fe lines) and ∆[Fe/H](=[FeI/H]-[FeII/H]), in 79 Exoplanet Host stars (66 main sequence and 13 giants), with respect to 322 solar neighborhood field stars (9 main sequence and 313
Star Formation in the Central Regions of Galaxies
, 2006
"... Summary. Massive star formation in the central regions of spiral galaxies plays an important role in the dynamical and secular evolution of their hosts. Here, we summarise a number of recent investigations of the star formation history and the physical conditions of the gas in circumnuclear regions, ..."
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Summary. Massive star formation in the central regions of spiral galaxies plays an important role in the dynamical and secular evolution of their hosts. Here, we summarise a number of recent investigations of the star formation history and the physical conditions of the gas in circumnuclear regions
Search for brown-dwarf companions of stars?
, 2010
"... Context. The frequency of brown-dwarf companions in close orbit around Sun-like stars is low compared to the frequency of plane-tary and stellar companions. Currently, there is no comprehensive explanation for this lack of brown-dwarf companions. Aims. Through the combination of the orbital solution ..."
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orbital solution is evaluated based on the distribution-free permutation test. Results. The discovery of 9 new brown-dwarf candidates orbiting stars in the CORALIE and HARPS radial-velocity surveys is re-ported. New CORALIE radial velocities yielding accurate orbits of 6 previously-known hosts
The magnetic field of the planet-hosting star τ Bootis
, 2007
"... We have obtained high resolution spectropolarimetric data for the planet-hosting star τ Bootis, using the ESPaDOnS spectropolarimeter at CFHT. A weak but clear Stokes V signature is detected on three of the four nights of June 2006 during which we have recorded data. This polarimetric signature indi ..."
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Cited by 2 (0 self)
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We have obtained high resolution spectropolarimetric data for the planet-hosting star τ Bootis, using the ESPaDOnS spectropolarimeter at CFHT. A weak but clear Stokes V signature is detected on three of the four nights of June 2006 during which we have recorded data. This polarimetric signature
Confirming the Metal-Rich Nature of Stars with Giant Planets
, 2001
"... With the goal of confirming the metallicity “excess ” observed in stars with planetary mass companions, we have conducted a high-precision spectroscopic study of a “comparison ” sample of dwarfs included in the CORALIE extra-solar planet survey (Santos, Israelian, & Mayor 2001). The targets wer ..."
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were chosen following two basic criteria: they make part of a limited volume and they do not present the signature of a planetary host companion. The spectroscopic analysis, done using the very same technique as previous works on the metallicity of stars with planets, permitted a direct and non
Results 1 - 10
of
163
