2025/07/17 by Geballe, T. R., Kaminskiy, B. M., Banerjee, D. P. K. +5
#FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR)
paper · doi:10.48550/arxiv.2507.13151
We report medium-resolution 0.85-2.45 μm spectroscopy obtained in 2015 and 2022 and high resolution 2.27-2.39 μm and 4.59-4.77 μm spectroscopy obtained in 2015 of V838 Monocerotis, along with modeling of the 0.85-2.45 μ spectrum. V838 Mon underwent a series of eruptions and extreme brightenings in 2002, which are thought to have occured as a result of a stellar merger. The new spectra and modelling of them reveal a disturbed red giant photosphere that is probably continuing to contract and ejecta that are cooling and continuing to disperse at velocities up to 200kms-1.