59 citations · 69 across the 2 of their papers we have counts for
4 papers
Var C: Long-term photometric and spectral variability of an LBV in M33
B. Burggraf, K. Weis, D. J. Bomans +6
So far the highly unstable phase of luminous blue variables (LBVs) has not been understood well. It is still uncertain why and which massive stars enter this phase. Investigating t…
Luminous and Variable Stars in M31 and M33. II. Luminous Blue Variables, Candidate LBVs, Fe II Emission Line Stars, and Other Supergiants
Roberta M. Humphreys, Kerstin Weis, Kris Davidson +2
An increasing number of non-terminal eruptions are being found in the numerous surveys for optical transients. Very little is known about these giant eruptions, their progenitors a…
The Wind of Variable C in M33
Roberta M. Humphreys, Kris Davidson, Michael Gordon +4
We discuss the spectrum of Var C in M33 obtained just before the onset of its current brightening and recent spectra during its present "eruption" or optically thick wind stage. Th…
Luminous and Variable Stars in M31 and M33. I. The Warm Hypergiants and Post-Red Supergiant Evolution
Roberta M. Humphreys, Kris Davidson, Skyler Grammer +4
The progenitors of Type IIP supernovae have an apparent upper limit to their initial masses of about 20 solar masses, suggesting that the most massive red supergiants evolve to war…