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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…
Thermal Emission in the Southwest Clump of VY CMa
Michael S. Gordon, Terry J. Jones, Roberta M. Humphreys +6
We present high spatial resolution LBTI/NOMIC images of VY CMa and its massive outflow feature, the Southwest (SW) Clump. Combined with high-resolution imaging from HST…
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…