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28 March 2024
 
  » arxiv » astro-ph/0308125

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Characteristics and classification of A-type supergiants in the Small Magellanic Cloud
C. J. Evans ; I. D. Howarth ;
Date 7 Aug 2003
Journal Mon.Not.Roy.Astron.Soc. 345 (2003) 1223
Subject astro-ph
AffiliationING), I. D. Howarth (UCL
AbstractWe address the relationship between spectral type and physical properties for A-type supergiants in the SMC. We first construct a self-consistent classification scheme for A supergiants, employing the calcium K to H epsilon line ratio as a temperature-sequence discriminant. Following the precepts of the `MK process’, the same morphological criteria are applied to Galactic and SMC spectra with the understanding there may not be a correspondence in physical properties between spectral counterparts in different environments. We then discuss the temperature scale, concluding that A supergiants in the SMC are systematically cooler than their Galactic counterparts at the same spectral type, by up to ~10%. Considering the relative line strengths of H gamma and the CH G-band we extend our study to F and early G-type supergiants, for which similar effects are found. We note the implications for analyses of extragalactic luminous supergiants, for the flux-weighted gravity-luminosity relationship and for population synthesis studies in unresolved stellar systems.
Source arXiv, astro-ph/0308125
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