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Changes: The Past, Present, and Future of the Nearby Dwarf Galaxy NGC 55

  • Authors: T. J. Davidge

2019 The Astronomical Journal 158 90.

  • Provider: AAS Journals

Caption: Figure 16.

Spectra normalized to the continuum of sources with CN absorption bands. Two spectra from Davidge (2018a) are also shown: (1) the spectrum of the C star 2MASS 05284449–6614309, which is the most luminous C star in NGC 1978, and (2) the spectrum of LMC cluster NGC 1978 Pointing 3 (P3), which shows the light of 2MASS 05284449–6614309 combined with that of the underlying cluster. A comparison of the spectra of NGC 1978 P3 and 2MASS 05284449–6614309 indicates that while the CN bands that are signatures of C stars are subdued in integrated light, they can still be detected in the composite spectrum. The depths of the CN bands in the NGC 55 sources suggest that the light originates from a stellar system rather than a single star. The similarity between the spectra of the sources in NGC 55 and NGC 1978 P3 is likely a selection effect (see text).

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