176 citations · 1.7k across the 50 of their papers we have counts for
51 papers
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…
Radiation-Driven Stellar Eruptions
Kris Davidson
Very massive stars occasionally expel material in colossal eruptions, driven by continuum radiation pressure rather than blast waves. Some of them rival supernovae in total radiati…
Luminous and Variable Stars in NGC 2403 and M81
Roberta M. Humphreys, Sarah Stangl, Michael S. Gordon +2
We present the results of spectroscopy and multi-wavelength photometry of luminous and variable star candidates in the nearby spiral galaxies NGC 2403 and M81. We discuss specific…
Gaia, Trumpler 16, and Eta Carinae
Kris Davidson, Greta Helmel, Roberta M. Humphreys
Gaia parallaxes for the star cluster Tr 16 reveal a discrepancy in the oft-quoted distance of Eta Carinae. It is probably more distant and more luminous. Moreover, many presumed me…
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…