scholarly journals Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. I. Signatures of Diffusion in the Open Cluster M67

2018 ◽  
Vol 857 (1) ◽  
pp. 14 ◽  
Author(s):  
Diogo Souto ◽  
Katia Cunha ◽  
Verne V. Smith ◽  
C. Allende Prieto ◽  
D. A. García-Hernández ◽  
...  
Keyword(s):  
Main Sequence ◽  
Open Cluster ◽  
Chemical Abundances ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. II. Atomic Diffusion in M67 Stars

2019 ◽  
Vol 874 (1) ◽  
pp. 97 ◽  
Author(s):  
Diogo Souto ◽  
C. Allende Prieto ◽  
Katia Cunha ◽  
Marc Pinsonneault ◽  
Verne V. Smith ◽  
...  
Keyword(s):  
Main Sequence ◽  
Atomic Diffusion ◽  
Chemical Abundances ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals OCCASO – III. Iron peak and α elements of 18 open clusters. Comparison with chemical evolution models and field stars

2019 ◽  
Vol 490 (2) ◽  
pp. 1821-1842 ◽  
Author(s):  
L Casamiquela ◽  
S Blanco-Cuaresma ◽  
R Carrera ◽  
L Balaguer-Núñez ◽  
C Jordi ◽  
...  
Keyword(s):  
Chemical Evolution ◽  
Open Cluster ◽  
Dynamical Evolution ◽  
Open Clusters ◽  
Chemical Abundances ◽  
Homogeneous Sample ◽  
Giant Stars ◽  
Stellar Nucleosynthesis ◽  
Solar Abundances ◽  
Red Giant

ABSTRACT The study of open-cluster chemical abundances provides insights on stellar nucleosynthesis processes and on Galactic chemo-dynamical evolution. In this paper we present an extended abundance analysis of 10 species (Fe, Ni, Cr, V, Sc, Si, Ca, Ti, Mg, O) for red giant stars in 18 OCCASO clusters. This represents a homogeneous sample regarding the instrument features, method, line list and solar abundances from confirmed member stars. We perform an extensive comparison with previous results in the literature, and in particular with the Gaia FGK Benchmark stars Arcturus and $\mu$-Leo. We investigate the dependence of [X/Fe] with metallicity, Galactocentric radius (6.5 kpc < RGC < 11 kpc), age (0.3 Gyr < Age < 10 Gyr), and height above the plane (|z| < 1000 pc). We discuss the observational results in the chemo-dynamical framework, and the radial migration impact when comparing with chemical evolution models. We also use APOGEE DR14 data to investigate the differences between the abundance trends in RGC and |z| obtained for clusters and for field stars.

scholarly journals 12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791

2017 ◽  
Vol 474 (4) ◽  
pp. 4810-4817 ◽  
Author(s):  
László Szigeti ◽  
Szabolcs Mészáros ◽  
Verne V Smith ◽  
Katia Cunha ◽  
Nadège Lagarde ◽  
...  
Keyword(s):  
Open Cluster ◽  
Isotopic Ratios ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals RADIAL VELOCITIES AND METALLICITIES OF RED GIANT STARS IN THE OLD OPEN CLUSTER NGC 7762

2016 ◽  
Vol 152 (6) ◽  
pp. 224 ◽  
Author(s):  
Giovanni Carraro ◽  
Eugene A. Semenko ◽  
Sandro Villanova
Keyword(s):  
Open Cluster ◽  
Radial Velocities ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

Vilnius Photometry of Red Giant Stars in the Open Cluster NGC 7789

2004 ◽  
Vol 294 (3-4) ◽  
pp. 225-240 ◽  
Author(s):  
Stanislava Bartašiutė ◽  
Gražina Tautvaišienė
Keyword(s):  
Open Cluster ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals Models of red giants in the CoRoT asteroseismology fields combining asteroseismic and spectroscopic constraints

2015 ◽  
Vol 11 (A29B) ◽  
pp. 525-528
Author(s):  
Lagarde Nadège
Keyword(s):  
Spectroscopic Study ◽  
Stellar Evolution ◽  
Open Cluster ◽  
Stellar Populations ◽  
Red Giants ◽  
Seismic Properties ◽  
Giant Stars ◽  
Statistical Studies ◽  
Red Giant Stars ◽  
Red Giant

AbstractThe availability of asteroseismic constraints for a large sample of red-giant stars from the CoRoT and Kepler missions paves the way for various statistical studies of the seismic properties of stellar populations. We use a detailed spectroscopic study of 19 CoRoT red-giant stars (Morel et al. 2014) to compare theoretical stellar evolution models to observations of the open cluster NGC 6633 and field stars. This study is already published in Lagarde et al. (2015)

A correlation between GALEX FUV magnitude and chromospheric activity among red giant stars

2018 ◽  
Vol 35 ◽  
Author(s):  
Graeme H. Smith
Keyword(s):  
Stellar Evolution ◽  
Main Sequence ◽  
Giant Stars ◽  
Chromospheric Activity ◽  
Chromospheric Emission ◽  
Red Giant Stars ◽  
Red Giant ◽  
Far Ultraviolet

AbstractIt is shown that upon combining GALEX far-ultraviolet and Johnson B magnitudes a resultant FUV–B colour can be obtained that for red giant stars of luminosity classes III and II correlates well with chromospheric emission in the cores of the Mg iih and k lines. Giant stars throughout the colour range 0.8 ≤ B – V ≤ 1.6 exhibit such a phenomenon. The main result of this paper is to show that GALEX far-ultraviolet photometry can provide information about the degree of chromospheric activity among red giant stars, and as such may offer a tool for surveying the evolution of chromospheric activity from the main sequence into the red giant phases of stellar evolution.

scholarly journals Multisite campaign on the open cluster M67 - II. Evidence for solar-like oscillations in red giant stars

2007 ◽  
Vol 377 (2) ◽  
pp. 584-594 ◽  
Author(s):  
D. Stello ◽  
H. Bruntt ◽  
H. Kjeldsen ◽  
T. R. Bedding ◽  
T. Arentoft ◽  
...  
Keyword(s):  
Open Cluster ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals Chemical Abundances of Red Giant Stars in the Globular Cluster M107 (NGC 6171)

2011 ◽  
Vol 123 (908) ◽  
pp. 1139-1148 ◽  
Author(s):  
Julia E. O’Connell ◽  
Christian I. Johnson ◽  
Catherine A. Pilachowski ◽  
Geoffrey Burks
Keyword(s):  
Globular Cluster ◽  
Chemical Abundances ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant
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