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Stars: low

Low Mass Companions for five solar type stars from the Magellan Planet Search Program

Low Mass Companions for five solar type stars from the Magellan Planet Search Program

... Figure 10 shows the position of known extrasolar planetary system in the star mass versus apparent magnitude diagram. The new planets from our survey (this work; Lopez-Morales et al. 2008) are shown with large full ...

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The Gaia ESO Survey: Low α element stars in the Galactic bulge

The Gaia ESO Survey: Low α element stars in the Galactic bulge

... First of all, we have analysed the abundances of Mg and Si and their trends with the Fe abundance. Figure 2 shows the [Mg/Fe] versus [Fe/H] distribution (upper panel), [Si/Fe] versus [Fe/H] distribution (middle panel), ...

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The Gaia ESO Survey: lithium depletion in the Gamma Velorum cluster and inflated radii in low mass pre main sequence stars

The Gaia ESO Survey: lithium depletion in the Gamma Velorum cluster and inflated radii in low mass pre main sequence stars

... that stars with M < ...that low-mass PMS stars (including those in Gamma Velo- rum) do rotate rapidly and show high levels of magnetic activity (Frasca et ...in low-mass PMS stars, ...

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Oxygen Abundances in Low  and High alpha Field Halo Stars and the Discovery of Two Field Stars Born in Globular Clusters

Oxygen Abundances in Low and High alpha Field Halo Stars and the Discovery of Two Field Stars Born in Globular Clusters

... dwarf stars in the metallicity range ...These stars have precise atmospheric parameters measured by Nissen and Schuster, who find that they separate into three groups based on their kinematics and α-element ...

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Spectroscopic Validation of Low metallicity Stars from RAVE

Spectroscopic Validation of Low metallicity Stars from RAVE

... the low-metallicity targets was based on the stellar parameters published in RAVE Data Releases 4 and ...(CEMP) stars in this sample. We find that 88% of the observed stars have [Fe/H] ≤ ...four ...

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The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity

The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity

... bulge stars of all metallicities, the simulations / Bayesian approach would require a much harder effort from other teams to reproduce / falsify ...bulge stars into metal-rich ([ Fe / H ]+ ...

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VVV high proper motion stars – I  The catalogue of bright KS ≤ 13 5 stars

VVV high proper motion stars – I The catalogue of bright KS ≤ 13 5 stars

... of new nearby cool dwarfs and UCDs (spectral types > M6) with a higher completeness than has previously been achieved in the low southern Galactic latitudes (e.g. from 2MASS and Deep Near Infrared Survey of the ...

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The double sub giant branch of NGC 6656 (M 22): a chemical characterization

The double sub giant branch of NGC 6656 (M 22): a chemical characterization

... RGB stars. Those papers demonstrate that M 22 hosts two groups of stars, one that is s-rich and one that is s-poor, with different metallicities by a mean [Fe/H] variation of ...s-rich stars having ...

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Clustering based feature learning on variable stars

Clustering based feature learning on variable stars

... distance (distant points get low similarities), but the method can be applied to any arbi- trary similarity measure. The values along the diagonal of the similarity matrix, s(k, k) are called “preferences”, and a ...

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Formation of multiple populations in globular clusters: another possible scenario

Formation of multiple populations in globular clusters: another possible scenario

... massive stars (super-AGB and/or AGB stars). As a result, the newborn stars belonging to the fourth generation (4G) will have a chemical composition that is a mixture of products from the three ...

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Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars

... variable stars, with ages typically > 11 Gyr ( ...Lyrae stars are typical members of Galactic globular clusters and the fi eld of the Galactic halo but have also been found in large numbers toward the ...

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On a New Theoretical Framework for RR Lyrae Stars  II  Mid infrared Period Luminosity Metallicity Relations

On a New Theoretical Framework for RR Lyrae Stars II Mid infrared Period Luminosity Metallicity Relations

... phases low- and intermediate-mass stars cross the so-called Cepheid instability strip ( a region of the HR diagram in which stellar atmospheres are pulsationally stable ) ...

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Uncloaking globular clusters in the inner galaxy

Uncloaking globular clusters in the inner galaxy

... Figure 3. Probability to belong to the cluster as a function of distance to the center of the cluster. We should note, however, that both for the central regions where the crowding is more significant (as mentioned in ...

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Constraints on Helium Enhancement in the Globular Cluster M3 (Ngc 5272): The Horizontal Branch Test

Constraints on Helium Enhancement in the Globular Cluster M3 (Ngc 5272): The Horizontal Branch Test

... HB stars in ...HB stars in M13 (NGC 6205) have a similar helium abundance as in ...more stars in both clusters would certainly prove of interest to derive more conclusive ...

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Intergalactic stellar populations in intermediate redshift clusters

Intergalactic stellar populations in intermediate redshift clusters

... old stars, consistent with the model predictions that the majority of the ICL stars come from massive galaxies, there is a significant fraction of ICL stars that are old and metal poor, indicating ...

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Deep census of variable stars in a VLT/VIMOS field in Carina

Deep census of variable stars in a VLT/VIMOS field in Carina

... 372 stars in Lupus, what corresponds to ∼ 0 ...000 stars, 50 099 were found to vary in ...the stars in the sample, is much higher than in the two ...

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Automatic survey invariant classification of variable stars

Automatic survey invariant classification of variable stars

... We extract features from the lightcurves using the Feature Analysis for Time Series (FATS) Python package (Nun et al., 2015). In addition to the two top features according to the importance ranking presented by Nun et ...

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Massive stars in the SDSS IV/APOGEE SURVEY  I  OB stars

Massive stars in the SDSS IV/APOGEE SURVEY I OB stars

... blue stars to characterize telluric ...of stars that served as telluric standards ( for details on the APOGEE survey target selection, see Zasowski et ...

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Obscured clusters III  Follow up observations of Mercer 23

Obscured clusters III Follow up observations of Mercer 23

... show He ii 2.18 μm in absorption. Finally, the H i Brackett lines of 1.67 μm, and 1.74 μm, He i 1.70 μm and He ii 1.69 μm are all in absorption. While the K-band alone does not provide clas- sifications as accurate as ...

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Simulations of star formation in a gaseous disc around Sgr A*  a failed Active Galactic Nucleus

Simulations of star formation in a gaseous disc around Sgr A* a failed Active Galactic Nucleus

... These results could in principle simply mean that we do not have a sufficient time resolution to integrate small-scale dynamics of stars in these ministar clusters. To check this, we have run an additional ...

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