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YBC, a stellar bolometric corrections database with variable extinction coefficients: an application to PARSEC isochrones
Yang Chen, Léo Girardi, Xiaoting Fu +7
We present the \texttt{YBC} database of stellar bolometric corrections (BCs), available at \url{http://stev.oapd.inaf.it/YBC}. We homogenize widely-used theoretical stellar spectra…
Multiple stellar populations in NGC 1866. New clues from Cepheids and Colour-Magnitude Diagram
Guglielmo Costa, Léo Girardi, Alessandro Bressan +5
We perform a comprehensive study of the stellar populations in the young Large Magellanic Cloud cluster NGC 1866, combining the analysis of its best-studied Cepheids with that of a…
Period-luminosity diagram of long period variables in the Magellanic Clouds. New aspects revealed from Gaia Data Release 2
T. Lebzelter, M. Trabucchi, N. Mowlavi +4
Context: The period-luminosity diagram (PLD) has proven to be a powerful tool for studying populations of pulsating red giants. Gaia Data Release 2 (DR2) provides a large data set…
On the photometric signature of fast rotators
Léo Girardi, Guglielmo Costa, Yang Chen +4
Rapidly rotating stars have been recently recognized as having a major role in the interpretation of colour-magnitude diagrams of young and intermediate-age star clusters in the Ma…
A Dramatic Decrease in Carbon Star Formation in M31
M. L. Boyer, B. F. Williams, B. Aringer +8
We analyze resolved stellar near-infrared photometry of 21 HST fields in M31 to constrain the impact of metallicity on the formation of carbon stars. Observations of nearby galaxie…
Carbon stars with increased oxygen and nitrogen abundances: hydrostatic dust-free model atmospheres
Bernhard Aringer, Paola Marigo, Walter Nowotny +3
We have computed a grid of hydrostatic spherical COMARCS models for C stars covering metallicities from [Z/H]=0 to -2 and values of the carbon excess [C-O] from 6.41 to 9.15, plus…