162 citations · 2.3k across the 69 of their papers we have counts for
70 papers
Yellow Supergiants and Post-Red Supergiant Evolution in the Large Magellanic Cloud
Roberta M. Humphreys, Terry J. Jones, John C. Martin
The empirical evidence for an upper mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 Msun, raises questions about the fate of the most luminous,…
A New LBV Candidate in M33
John C. Martin, Roberta M. Humphreys, Kerstin Weis +1
The evolutionary relationships and mechanisms governing the behavior of the wide variety of luminous stars populating the upper H-R diagram are not well established. Luminous blue…
Episodic Gaseous Outflows and Mass Loss from Red Supergiants
Roberta M. Humphreys, Terry J. Jones
The red hypergiant VY CMa and the more typical red supergiant Betelgeuse provide clear observational evidence for discrete, directed gaseous outflows in their optical and infrared…
The Altered State of Carinae: HST's Photometric Record 1998--2021
John C. Martin, Kris Davidson, Roberta M. Humphreys +1
Hubble Space Telescope photometry of Carinae spans 23 years, including five spectroscopic events. The rapid brightening rate decreased after 2010, and the spectroscopic events…
The Mass-Loss History of the Red Hypergiant VY CMa
Roberta M. Humphreys, Kris Davidson, A. M. S. Richards +3
Imaging and spectroscopy of the knots, clumps, and extended arcs in the complex ejecta of VY CMa confirm a record of high mass loss events over the past few hundred years. HST/STIS…
Red Supergiants, Yellow Hypergiants, and Post-RSG Evolution
Michael S. Gordon, Roberta M. Humphreys
How massive stars end their lives remains an open question in the field of star evolution. While the majority of stars above 9 M_sun will become red supergiants (RSGs), the termina…