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首页> 外文期刊>The Astronomical journal >Spectral types of red supergiants in NGC6822 and the Wolf-Lundmark-Melotte galaxy
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Spectral types of red supergiants in NGC6822 and the Wolf-Lundmark-Melotte galaxy

机译：Spectral types of red supergiants in NGC6822 and the Wolf-Lundmark-Melotte galaxy

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摘要

We present moderate-resolution spectroscopic observations of red supergiants (RSGs) in the low-metallicity Local Group galaxies NGC6822 (Z = 0.4 Z _⊙) and Wolf-Lundmark-Melotte (WLM; Z = 0.1 Z _⊙). By combining these observations with reduction techniques for multislit data reduction and flux calibration, we are able to analyze spectroscopic data of 16 RSGs in NGC6822 and spectrophotometric data of 11 RSGs in WLM. Using these observations, we determine spectral types for these massive stars, comparing them to Milky Way and Magellanic Cloud RSGs and thus extending observational evidence of the abundance-dependent shift of RSG spectral types to lower metallicities. In addition, we have uncovered two RSGs with unusually late spectral types (J000158.14-152332.2 in WLM, with a spectral type of M3 I, and J194453.46-144552.6 in NGC6822, with a spectral type of M4.5 I) and a third RSG (J194449.96-144333.5 in NGC6822) whose spectral type has varied from an M2.5 in 1997 to a K5 in 2008. All three of these stars could potentially be members of a recently discovered class of extreme RSG variables.

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