2018ARep...62...19K -
Astron. Rep., 62, 19-30 (2018)
The problem of spectral mimicry of supergiants.
KLOCHKOVA V.G. and CHENTSOV E.L.
Abstract (from CDS):
The phenomenon of spectral mimicry refers to the fact that hypergiants and post-AGB supergiants-stars of different masses in fundamentally different stages of their evolution-have similar optical spectra, and also share certain other characteristics (unstable extended atmospheres, expanding dust-gas envelopes, high IR excesses). As a consequence, it is not always possible to distinguish post-AGB stars from hypergiants based on individual spectral observations in the optical. Examples of spectral mimicry are analyzed using uniform, high-quality spectral material obtained on the 6-m telescope of the Special Astrophysical Observatory in the course of long-term monitoring of high-luminosity stars. It is shown that unambiguously resolving the mimicry problem for individual stars requires the determination of a whole set of parameters: luminosity, wind parameters, spectral energy distribution, spectral features, velocity field in the atmosphere and circumstellar medium, behavior of the parameters with time, and the chemical composition of the atmosphere.
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Journal keyword(s):
CDS comments:
2018AZh....95...22K
Simbad objects:
12
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