253 citations · 1.1k across the 28 of their papers we have counts for
28 papers
On the Spatial Distribution of Luminous Blue Variables, B[e] Supergiants, and Wolf-Rayet stars in the Large Magellanic Cloud
John C. Martin, Roberta M. Humphreys, Kris Davidson
We examine the spatial distributions of LBVs, B[e] supergiants, and W-R stars in the LMC, to clarify their relative ages, evolutionary states, and relationships. This survey employ…
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…
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…
Eta Carinae's Declining Outflow Seen in the UV, 2002-2015
Kris Davidson, Kazunori Ishibashi, John C. Martin +1
Existing HST UV data offer many previously neglected clues to eta Car's behavior since 2000. Here we examine a subset of observations with diverse results. (1) The star's rapid cha…
Luminous and Variable Stars in M31 and M33 V. The Upper HR Diagram
Roberta M. Humphreys, Kris Davidson, David Hahn +2
We present HR Diagrams for the massive star populations in M31 and M33 including several different types of emission-line stars: the confirmed Luminous Blue Variables (LBVs), candi…