4 papers
Lithium-rich M-dwarfs at the ZAMS: Evidence for planetary engulfment?
R. D. Jeffries, R. J. Jackson, I. Baraffe
We identify 6 early M-dwarfs, in 3 open clusters (NGC 2451a, Blanco 1 and NGC 2516) at ages of 50-200 Myr, that are anomalously enriched in lithium compared with Li-depleted siblin…
Reconciled warning signals in observations and models imply approaching AMOC tipping point
Yechul Shin, Ji-Hoon Oh, Sebastian Bathiany +8
Paleoclimate proxy records and models suggest that the Atlantic Meridional Overturning Circulation (AMOC) can transition abruptly between a strong and a weak state. Empirical warni…
Recent and Upcoming Upgrades for MIRC-X and MYSTIC on the CHARA Array
Noura Ibrahim, Mayra Gutierrez, John D. Monnier +17
MIRC-X and MYSTIC are six-telescope near-infrared beam (1.08-2.38 m) combiners at the CHARA Array on Mt Wilson CA, USA. Ever since the commissioning of MIRC-X (J and H bands) i…
Revisiting the accretion disc spectra of Dwarf Novae and Novalike variables: implications for the standard disc model
Gabriella Zsidi, C. J. Nixon, T. Naylor +1
Accretion discs are fundamental to much of astronomy. They can occur around stars both young and old, around compact objects they provide a window into the extremes of physics, and…