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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660652.0, MPI für Astronomie / Publikationen_mpia
Photometric determination of the mass accretion rates of pre-mainsequence stars - III. Results in the Large Magellanic Cloud
Authors:Spezzi, L.; de Marchi, G.; Panagia, N.; Sicilia-Aguilar, A.; Ercolano, B.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:Monthly Notices of the Royal Astronomical Society
Issue / Number:1
Start Page:78
End Page:97
Audience:Not Specified
Abstract / Description:We present a multiwavelength study of three star-forming regions, spanning the age range 1-14 Myr, located between the 30 Doradus complex and supernova SN 1987A in the Large Magellanic Cloud (LMC). We reliably identify about 1000 pre-main-sequence (PMS) star candidates actively undergoing mass accretion and estimate their stellar properties and mass accretion rate (?). Our measurements represent the largest ? data set of low-metallicity stars presented so far. As such, they offer a unique opportunity to study on a statistical basis the mass accretion process in the LMC and, more in general, the evolution of the mass accretion process around low-metallicity stars. We find that the typical ? of PMS stars in the LMC is higher than for galactic PMS stars of the same mass, independently of their age. Taking into account the caveats of isochronal age and ? estimates, the difference in ? between the LMC and our Galaxy appears to be about an order of magnitude. We review the main mechanisms of disc dispersal and find indications that typically higher ? are to be expected in low-metallicity environments. However, many issues of this scenario need to be clarified by future observations and modelling. We also find that, in the mass range 1-2 M&sun;, ? of PMS stars in the LMC increases with stellar mass as ?, with b≈ 1, i.e. slower than the second power law found for galactic PMS stars in the same mass regime.
Free Keywords:stars: formation; stars: pre-main-sequence; Magellanic Clouds
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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