New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies

Abstract

We extend the {\sl\,PARSEC} library of stellar evolutionary tracks by computing new models of massive stars, from 14\Msun to 350\Msun. The input physics is the same used in the {\sl\,PARSEC}~V1.1 version, but for the mass-loss rate which is included by considering the most recent updates in literature. We focus on low metallicity, $Z$=0.001 and $Z$=0.004, for which the metal poor dwarf irregular star forming galaxies, Sextans A, WLM and NCG6822, provide simple but powerful workbenches. The models reproduce fairly well the observed CMDs but the stellar colour distributions indicate that the predicted blue loop is not hot enough in models with canonical extent of overshooting. In the framework of a mild extended mixing during central hydrogen burning, the only way to reconcile the discrepancy is to enhance the overshooting at the base of the convective envelope (EO) during the first dredge-UP. The mixing scales required to reproduce the observed loops, EO=2\HP or EO=4\HP, are definitely larger than those derived from, e.g., the observed location of the RGB bump in low mass stars. This effect, if confirmed, would imply a strong dependence of the mixing scale below the formal Schwarzschild border, on the stellar mass or luminosity. Reproducing the features of the observed CMDs with standard values of envelope overshooting would require a metallicity significantly lower than the values measured in these galaxies. Other quantities, such as the star formation rate and the initial mass function, are only slightly sensitive to this effect. Future investigations will consider other metallicities and different mixing schemes.

arXiv comment19 pages, 14 figures, accepted to MNRAS

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• Pulsation in TESS Objects of Interest
• Physical parameters of stellar population in star formation regions of galaxies
• Ultra-Faint Milky Way Satellites Discovered in Carina, Phoenix, and Telescopium with DELVE Data Release 3
• DELVE Milky Way Satellite Galaxy Census I: Satellite Population and Survey Selection Function in DES, DELVE, and Pan-STARRS
• LAMOST 1: A Disrupted Satellite in the Constellation Draco
• The multi-age stellar populations of Terzan 5 as revealed by JWST
• Stellar evolution through the Red Supergiant phase
• Stellar initial mass function in the 100-pc solar neighbourhood
• The stellar content of H72.97-69.39, a potential super star cluster in the making
• Discovery of Two Different Full Disk Evolutionary Patterns of M-type T Tauri Stars with LAMOST DR8
• The DR14 APOGEE-TGAS catalogue: Precise chemo-kinematics in the extended solar vicinity
• A Multiwavelength Classification and Study of Red Supergiant Candidates in NGC 6946
• Parameters of Star Formation Regions in Galaxies NGC 3963 and NGC 7292
• Age and metallicity of the Milky Way's nuclear star cluster studied at 3 pc from Sagittarius A*
• A study on late time UV-emission in core collapse supernovae and the implications for the peculiar transient AT2018cow
• The nature of ASASSN-24fw's occultation: modelling the event as dimming by optically thick rings around a sub-stellar companion
• Far-infrared line emission from the outer Galaxy cluster Gy 3-7 with SOFIA/FIFI-LS: Physical conditions and UV fields
• Characterising the orbit and circumstellar environment of the high-mass binary MWC 166 A
• Asteroseismology of red giants in the globular cluster 47 Tuc using the HST
• The Predicted Properties of Helium-Enriched Globular Cluster Progenitors at High Redshift
• Accurate orbital solution for the new and metal poor eclipsing binary Tycho~5227-1023-1
• A closer look at the young stellar group around Sh 2-295
• Distance estimation of the high-velocity cloud Anti-Center Shell
• Metallicities in M dwarfs: Investigating different determination techniques
• Distance and extinction to the Milky Way spiral arms along the Galactic centre line of sight
• The bimodal distribution of donor stars in X-ray binaries
• The tidal quality of the hot Jupiter WASP-12b
• The reason for the occurrence of W-type contact binaries
• The mmax-Mecl relation in the LEGUS clusters
• J-PLUS Reconstructing the Milky Way Disc's star formation history with twelve-filter photometry
• Radio observations of massive stars in the Galactic centre: The Quintuplet cluster
• Isolated massive star candidates in NGC 4242 with GULP
• The Longest-period Young Transiting Exoplanets. A Duo of Puffy Giants inside a Debris Disk
• Evryscope-South Survey of Upper- and Pre-main Sequence Solar Neighborhood Stars
• SDSS-IV MaStar: Determination of Stellar Parameters Using Bayesian Averaging
• The Progenitor of the S147 Supernova Remnant