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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 | | Affiliation: | ING), I. D. Howarth (UCL | | Abstract: | We 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 | | Services: | Forum | Review | PDF | Favorites | |
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