Figer, Donald F.; Najarro, Francisco; Messineo, Maria; Clark, J. Simon and Menten, Karl M.
(2020).
A New Candidate Luminous Blue Variable.
The Astrophysical Journal Letters, 901(1), article no. L15.
DOI: https://doi.org/10.3847/2041-8213/abb704
We identify IRAS 16115−5044, which was previously classified as a protoplanetary nebula (PPN), as a candidate luminous blue variable (LBV). The star has high luminosity (
), ensuring supergiant status, has a temperature similar to LBVs, is photometrically and spectroscopically variable, and is surrounded by warm dust. Its near-infrared spectrum shows the presence of several lines of H I, He I, Fe II, Fe [II], Mg II, and Na I with shapes ranging from pure absorption and P Cygni profiles to full emission. These characteristics are often observed together in the relatively rare LBV class of stars, of which only ≈20 are known in the Galaxy. The key to the new classification is the fact that we compute a new distance and extinction that yields a luminosity significantly in excess of those for post-AGB PPNe, for which the initial masses are 
. Assuming single star evolution, we estimate an initial mass of 
.
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