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2014MNRAS.439.3308D - Mon. Not. R. Astron. Soc., 439, 3308-3328 (2014/April-3)
Strong biases in estimating the time dependence of mass accretion rates in young stars.
DA RIO N., JEFFRIES R.D., MANARA C.F. and ROBBERTO M.
Abstract (from CDS):
We find that the presence of realistic uncertainties reduces the measured value of η by up to a factor of 3, leading to the inference of shallower decays than the true value. This suggests a much faster temporal decay of {dot}M_acc than generally assumed. When considering the minimum uncertainties in ages affecting the Orion Nebula Cluster, the observed value η ∼ 1.4, typical of Galactic star-forming regions, can only be reproduced if the real decay exponent is η ≳ 4. This effect becomes more severe if one assumes that observational uncertainties are larger, as required by some fast star formation scenarios. Our analysis shows that while selection effects due to sample incompleteness do bias η, they cannot alter this main result and strengthen it in many cases. A remaining uncertainty in our work is that it applies to the most commonly used and simple relationship between {dot}M_acc, the accretion luminosity and the stellar parameters. We briefly explore how a more complex interplay between these quantities might change the results.
Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)
Journal keyword(s): circumstellar matter - stars: formation - stars: fundamental parameters - Hertzsprung-Russell and colour-magnitude diagrams - stars: pre-main-sequence
Simbad objects: 2
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