Search Results - "Girardi, Léo"

Red Clump Stars by Girardi, Léo

“…Low-mass stars in their core-helium-burning stage define the sharpest feature present in the color-magnitude diagrams of nearby galaxy systems: the red clump…”
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parsec evolutionary tracks of massive stars up to 350 M⊙ at metallicities 0.0001 ≤ Z ≤ 0.04 by Chen, Yang, Bressan, Alessandro, Girardi, Léo, Marigo, Paola, Kong, Xu, Lanza, Antonio

“…We complement the parsec data base of stellar evolutionary tracks with new models of massive stars, from the pre-main-sequence phase to the central carbon…”
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Improving PARSEC models for very low mass stars by Chen, Yang, Girardi, Léo, Bressan, Alessandro, Marigo, Paola, Barbieri, Mauro, Kong, Xu

“…Many stellar models present difficulties in reproducing basic observational relations of very low mass stars (VLMS), including the mass-radius relation and the…”
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Updated Low-temperature Gas Opacities with ÆSOPUS 2.0 by Marigo, Paola, Aringer, Bernhard, Girardi, Léo, Bressan, Alessandro

“…Abstract This work introduces new low-temperature gas opacities in the range 3.2 ≲ log ( T / K ) ≲ 4.5 computed with the Æ SOPUS code under the assumption of…”
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Extended Main-sequence Turn-offs in Intermediate-age Star Clusters: Stellar Rotation Diminishes, but Does Not Eliminate, Age Spreads by Goudfrooij, Paul, Girardi, Léo, Correnti, Matteo

“…Extended main-sequence turn-off (eMSTO) regions are a common feature in color-magnitude diagrams of young- and intermediate-age star clusters in the Magellanic…”
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Evolution of thermally pulsing asymptotic giant branch stars - I. The colibri code by Marigo, Paola, Bressan, Alessandro, Nanni, Ambra, Girardi, Léo, Pumo, Maria Letizia

“…We present the colibri code for computing the evolution of stars along the thermally pulsing asymptotic giant branch (TP-AGB) phase. Compared to purely…”
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New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star-forming dwarf galaxies by Tang, Jing, Bressan, Alessandro, Rosenfield, Philip, Slemer, Alessandra, Marigo, Paola, Girardi, Léo, Bianchi, Luciana

“…We extend the PARSEC library of stellar evolutionary tracks by computing new models of massive stars, from 14 to 350 M⊙. The input physics is the same used in…”
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PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code by Bressan, Alessandro, Marigo, Paola, Girardi, Léo, Salasnich, Bernardo, Dal Cero, Claudia, Rubele, Stefano, Nanni, Ambra

“…Abstract We present the updated version of the code used to compute stellar evolutionary tracks in Padova. It is the result of a thorough revision of the major…”
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Evolution of thermally pulsing asymptotic giant branch stars - II. Dust production at varying metallicity by Nanni, Ambra, Bressan, Alessandro, Marigo, Paola, Girardi, Léo

“…We present the dust ejecta of the new stellar models for the thermally pulsing asymptotic giant branch (TP-AGB) phase computed with the colibri code. We use a…”
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New parsec data base of α-enhanced stellar evolutionary tracks and isochrones – I. Calibration with 47 Tuc (NGC 104) and the improvement on RGB bump by Fu, Xiaoting, Bressan, Alessandro, Marigo, Paola, Girardi, Léo, Montalbán, Josefina, Chen, Yang, Nanni, Ambra

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Determining stellar parameters of asteroseismic targets: going beyond the use of scaling relations by Rodrigues, Thaíse S., Bossini, Diego, Miglio, Andrea, Girardi, Léo, Montalbán, Josefina, Noels, Arlette, Trabucchi, Michele, Coelho, Hugo Rodrigues, Marigo, Paola

“…Abstract Asteroseismic parameters allow us to measure the basic stellar properties of field giants observed far across the Galaxy. Most of such determinations…”
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A NEW GENERATION OF PARSEC-COLIBRI STELLAR ISOCHRONES INCLUDING THE TP-AGB PHASE by Marigo, Paola, Girardi, Léo, Bressan, Alessandro, Rosenfield, Philip, Aringer, Bernhard, Chen, Yang, Dussin, Marco, Nanni, Ambra, Pastorelli, Giada, Rodrigues, Thaíse S., Trabucchi, Michele, Bladh, Sara, Dalcanton, Julianne, Groenewegen, Martin A. T., Montalbán, Josefina, Wood, Peter R.

“…We introduce a new generation of PARSEC-COLIBRI stellar isochrones that includes a detailed treatment of the thermally pulsing asymptotic giant branch (TP-AGB)…”
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A Study of Primordial Very Massive Star Evolution by Volpato, Guglielmo, Marigo, Paola, Costa, Guglielmo, Bressan, Alessandro, Trabucchi, Michele, Girardi, Léo

“…Abstract We present new evolutionary models of primordial very massive stars with initial masses ranging from 100 to 1000 M ⊙ that extend from the main…”
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Evolution of thermally pulsing asymptotic giant branch stars - III. Dust production at supersolar metallicities by Nanni, Ambra, Bressan, Alessandro, Marigo, Paola, Girardi, Léo

“…We extend the formalism presented in our recent calculations of dust ejecta from the Thermally Pulsing Asymptotic Giant Branch (TP-AGB) phase to the case of…”
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A New Interpretation of the Period-Luminosity Sequences of Long-period Variables by Trabucchi, Michele, Wood, Peter R., Montalbán, Josefina, Marigo, Paola, Pastorelli, Giada, Girardi, Léo

“…Period-luminosity (PL) sequences of long-period variables (LPVs) are commonly interpreted as different pulsation modes, but there is disagreement on the modal…”
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CHEMICAL CARTOGRAPHY WITH APOGEE: METALLICITY DISTRIBUTION FUNCTIONS AND THE CHEMICAL STRUCTURE OF THE MILKY WAY DISK by Hayden, Michael R., Bovy, Jo, Holtzman, Jon A., Nidever, David L., Bird, Jonathan C., Weinberg, David H., Andrews, Brett H., Majewski, Steven R., Prieto, Carlos Allende, Anders, Friedrich, Beers, Timothy C., Bizyaev, Dmitry, Chiappini, Cristina, Cunha, Katia, Frinchaboy, Peter, García-Her andez, D. A., García Pérez, Ana E., Girardi, Léo, Harding, Paul, Hearty, Fred R., Johnson, Jennifer A., Mészáros, Szabolcs, Minchev, Ivan, O'Connell, Robert, Pan, Kaike, Robin, Annie C., Schiavon, Ricardo P., Schneider, Donald P., Schultheis, Mathias, Shetrone, Matthew, Skrutskie, Michael, Steinmetz, Matthias, Smith, Verne, Wilson, John C., Zamora, Olga, Zasowski, Gail

“…ABSTRACT Using a sample of 69,919 red giants from the SDSS-III/APOGEE Data Release 12, we measure the distribution of stars in the [ /Fe] versus [Fe/H] plane…”
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EVOLUTION OF THERMALLY PULSING ASYMPTOTIC GIANT BRANCH STARS. V. CONSTRAINING THE MASS LOSS AND LIFETIMES OF INTERMEDIATE-MASS, LOW-METALLICITY AGB STARS by Rosenfield, Philip, Marigo, Paola, Girardi, Leo, Dalcanton, Julianne J, Bressan, Alessandro, Williams, Benjamin F, Dolphin, Andrew

“…ABSTRACT Thermally pulsing asymptotic giant branch (TP-AGB) stars are relatively short lived (less than a few Myr), yet their cool effective temperatures, high…”
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Modelling long-period variables – I. A new grid of O-rich and C-rich pulsation models by Trabucchi, Michele, Wood, Peter R, Montalbán, Josefina, Marigo, Paola, Pastorelli, Giada, Girardi, Léo

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Modelling long-period variables – II. Fundamental mode pulsation in the non-linear regime by Trabucchi, Michele, Wood, Peter R, Mowlavi, Nami, Pastorelli, Giada, Marigo, Paola, Girardi, Léo, Lebzelter, Thomas

“…ABSTRACT Long-period variability in luminous red giants has several promising applications, all of which require models able to accurately predict pulsation…”
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ÆSOPUS 2.0: Low-temperature Opacities with Solid Grains by Marigo, Paola, Woitke, Peter, Tognelli, Emanuele, Girardi, Léo, Aringer, Bernhard, Bressan, Alessandro

“…Abstract In this study we compute the equation of state and Rosseland mean opacity from temperatures of T ≃ 30,000 K down to T ≃ 400 K, pushing the…”
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