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- W1997568118 abstract "Galactic and LMC cepheids and supergiants have been observed at the SAAO in the DDO photometric system. Their comparative properties are studied here using de-reddened two-colour diagrams with reddening ratios derived from early-type stars. The long period cepheids in our Galaxy lie above the Ib sequence in the 42–45, 45–48 diagram as expected from their relative luminosities, and the metallicity index δ 3842 indicates that there is little variation of abundance amongst galactic cepheids. Reddenings of cepheids may be obtained from the 42–45 and B–V indices; these so called ‘DDO’ reddenings show a systematic trend with period in the same sense as Kraft's do when compared with reddenings derived from BVI photometry. The brightest F and G supergiants in the LMC occupy positions in the 42–45, 45–48 diagram similar to galactic Ia supergiants of similar luminosity; the somewhat less luminous long period LMC cepheids lie between these and the Ib sequence. The LMC and galactic Ias also overlap in the 38–42, 45–48 diagram, indicating that any metal abundance differences in the LMC compared to the Galaxy have little effect on these colours." @default.
- W1997568118 created "2016-06-24" @default.
- W1997568118 creator A5062469941 @default.
- W1997568118 date "1981-12-01" @default.
- W1997568118 modified "2023-09-23" @default.
- W1997568118 title "The DDO properties of cepheids and supergiants" @default.
- W1997568118 doi "https://doi.org/10.1093/mnras/197.3.779" @default.
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