Lee Hartmann

TL;DR: In this paper, a study of 15 new brown dwarfs belonging to the 7 Myr old 25 Orionis group and Orion OB1a sub-association with spectral types between M6 and M9 and estimated masses between 0.07 M⊙ and 0.01 M ⊙ was presented, which supported the suggested scenario in which the dissipation of discs is less efficient for decreasing mass of the central object.

TL;DR: In this paper, the authors explored an alternative to standard spot models in which the missing flux from 'dark' spots is temporally redistributed; this model makes definite predictions about the correlation of mean light and color, and about the quiescent (i.e., unspotted) magnitudes of BY Draconis stars.

TL;DR: In this paper, a comparison of the fits to the continuum excess emission obtained with a slab model on the X-shooter spectra and the HST/STIS spectra shows a shortcoming in the Xshooter estimates of ≲10%, which is well within the assumed uncertainty.

TL;DR: In this paper, the authors identify four important factors for understanding rapid star formation and short cloud lifetimes: the accumulation and dispersal of clouds near the solar circle might occur in the atomic phase; only the high density portion of a cloud's lifecycle is spent in the molecular phase, thus helping to limit molecular cloud ''lifetimes''.

TL;DR: In this article, the short time-scale variability of singly ionized calcium chromospheric emission has been investigated in a few late-type stars, including Alpha Tau (K5 III), Lambda And (G8 III-IV), and Epsilon Eri (K2 V).