Low-resolution near-infrared SpeX spectra of 14 Cepheids recover global metallicities matching homogenized optical iron abundances with 0.09 dex scatter.
A new extragalactic distance determination method using the flux-weighted gravity of late B and early A supergiants
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abstract
Stellar evolution calculations predict the flux-weighted gravity g/Teff^4 and absolute bolometric magnitude of blue supergiants to be strongly correlated. We use medium resolution multi-object spectroscopy of late B and early A supergiants in two spiral galaxies, NGC 300 and NGC 3621, to demonstrate the existence of such a relationship, which proves to be surprisingly tight. An analysis of high resolution spectra of blue supergiants in Local Group galaxies confirms this detection. We discuss the application of the relationship for extragalactic distance determinations and conservatively conclude that once properly calibrated it has the potential to allow for measurements of distance moduli out to 30.5 mag with an accuracy of 0.1 mag or better.
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Cepheid metallicities from low-resolution near-infrared spectra: validation against the optical reference scale
Low-resolution near-infrared SpeX spectra of 14 Cepheids recover global metallicities matching homogenized optical iron abundances with 0.09 dex scatter.