Age and Metallicity
Age and metallicity gradients in early-type galaxies : a dwarf-to-giant sequence
... of age and metallicity have been observed in normal elliptical and S0 galaxies (M > 10 10 M ...the age and the ...to metallicity and that the age of the populations is generally ...
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The age–metallicity relation in the solar neighbourhood from a pilot sample of white dwarf–main sequence binaries
... between age and [Fe/H] using chromo- spheric activity to derive the ages of late-type stars and ages derived using isochrones for a sample of giants, ...between age and metallicity in the solar ...
8
Evolution of long-lived globular cluster stars. II. Sodium abundance variations on the asymptotic giant branch as a function of globular cluster age and metallicity
... As shown in Figs. 5, 6, and 7, the cut-off limit in initial he- lium and sodium abundance and on the stellar mass at which a star climbs the AGB is very sensitive to the mass loss rate adopted along the RGB. This was ...
10
Mid-infrared followup of cold brown dwarfs: Diversity in age, mass and metallicity
... Abstract. We use Spitzer IRAC 3.6–8.0 m photometry of late-type T dwarfs to investigate various trends which can aid the planning and interpretation of infrared (IR) surveys for the coldest T or Y dwarfs. Brown dwarfs ...
6
The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc
... Galactocentric distance. However, OCs with R GC < 7 kpc have larger age residuals than the other clusters or solar-like stars, as mentioned above. Moreover, we calculate the Y abundances using the photo- metric ...
17
Stellar Metallicity Gradients in SDSS Galaxies
... determine the best- fit metallicity and age from the Lick indices we have measured. We applied EZ _Ages to the stacked annuli, not the individual objects. We use solar isochrones and a Salpeter initial mass ...
17
Photometric Calibrations of Metallicity and Temperature For M Dwarfs
... the metallicity calibration to this large sample, we determined the metallicity distribution of late-type K and M ...in metallicity distribution toward lower metallicities as the Galactic height ...
128
Carbon gas in SMC low-metallicity star-forming regions
... expansion age is therefore ...actual age of about two million years, taking deceleration into ...the age of three million years estimated by Evans et ...radius, age, and expansion velocity ...
17
Inner galactic disc metallicity distributions and the bulge-disc relation
... The metallicity distribution of the sample is clearly more metal-rich than the solar neighborhood, implying a significant radial gradient in the galactic disc at the intermediate ages probed by red clump ...
5
Elevated curie temperature and half metallicity in the ferromagnetic semiconductor LaxEu1−xO
... Another explanation is the presence of a small percent- age of impurities lowering the overall magnetic moment measured by PNR. The figure also shows the calculated maximum and minimum possible polarization of the ...
8
Near-IR observations of NGC 6822: AGB stars, distance, metallicity and structure
... or age, is strongly reduced and the com- pleteness of J and K s band images is almost 100%; at the faintest magnitudes the completeness is dominated by seeing ...
14
METALLICITY CALIBRATIONS AND THE MASS-METALLICITY RELATION FOR STAR-FORMING GALAXIES
... 7. THE MZ RELATION: AGN REMOVAL METHODS The nebular emission line spectrum is sensitive to the hardness of the ionizing EUV radiation. Metallicities calculated from spectra that contain a significant con- tribution from ...
26
Spectroscopy of Galaxies: Evolution of Escape Fractions, Metallicity Gradients and Stellar Metallicity
... non-existent metallicity gradients than in previous studies of smaller samples observed in the same redshift ...the metallicity and none with the degree of rotational support, the latter being consistent ...
186
Wolf-Rayet Populations at High Metallicity
... high metallicity are ...higher metallicity, as a result of stronger mass-loss during earlier evolutionary phases with late WC subtypes signatures of solar metallicity or ...a metallicity ...
11
Metallicity Dependent Wolf-Rayet Winds
... In the case of a single massive star, the strength of stellar winds during the main sequence and blue supergiant phase scales with the metallicity (Vink et al. 2001). Conse- quently, one expects a higher threshold ...
10
Structure and metallicity of phase V of hydrogen
... ] for numerical de- tails of the sp-AIRSS searches, of the anharmonic vibra- tional calculations, of the quantum Monte Carlo calcula- tions, the Raman spectra of candidate structures, an[r] ...
12
Photometric metallicity map of the Small Magellanic Cloud
... are sparsely populated as they lie at the periphery of the observed re- gion. These factors can lead to poor estimation of RGB slope. Thus, the effect on our results by such sub-regions will be negligible. This is ...
19
Searching for the lowest metallicity galaxies in the local universe.
... However, searching for low-metallicity galaxies in either Pan-STARRS, DES, or DECaLS is complicated by the lack of u-band photometry, particularly because the most metal-poor systems currently known in the local ...
16
Metallicity distributions of globular cluster systems in galaxies
... van den Bergh 1998; Harris et al. 2000; Forbes et al. 2001; Larsen et al. 2001a; Ashman & Zepf 2001). In this paper, we compile a sample of colour distributions of GCS in galaxies. Colours were corrected from ...
8
On the relation between specific star formation rate and metallicity
... 3.1 General solution: Z as a function of time and sSFR Let us take a step back and start by recalling the formal general solutions for the gas and the metallicity evolution with the expl[r] ...
13