Two of the most Metal-deficient Stars

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The Pristine survey

Martin,

Starkenburg,

Yuan

et al. 2024

A&A

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We used the spectro-photometric information of $ million stars from Data Release 3 (DR3) to calculate synthetic, narrow-band, metallicity-sensitive $CaHK$ magnitudes that mimic the observations of the Pristine survey, a survey of photometric metallicities of Milky Way stars that has been mapping more than 6,500\,deg$^2$ of the northern sky with the Canada-France-Hawaii Telescope since 2015. These synthetic magnitudes were used for an absolute recalibration of the deeper Pristine photometry and, combined with broadband information, synthetic and Pristine $CaHK$ magnitudes were used to estimate photometric metallicities over the whole sky. The resulting metallicity catalogue is accurate down to $ and is particularly suited for the exploration of the metal-poor Milky Way ($ We make available here the catalogue of synthetic $CaHK_ syn $ magnitudes for all stars with BP/RP information in DR3, as well as an associated catalogue of more than $ million photometric metallicities for high signal-to-noise FGK stars. This paper further provides the first public data release of the Pristine catalogue in the form of higher quality recalibrated Pristine $CaHK$ magnitudes and photometric metallicities for all stars in common with the BP/RP spectro-photometric information in DR3. We demonstrate that, when available, the much deeper Pristine data greatly enhance the quality of the derived metallicities, in particular at the faint end of the catalogue ($G_ BP 16$). Combined, both photometric metallicity catalogues include more than two million metal-poor star candidates ($ phot <-1.0$) as well as more than 200,000 and sim 8,000 very and extremely metal-poor candidates ($ phot <-2.0$ and $<-3.0$, respectively). Finally, we show that these metallicity catalogues can be used efficiently, among other applications, for Galactic archaeology, to hunt for the most metal-poor stars, and to study how the structure of the Milky Way varies with metallicity, from the flat distribution of disk stars to the spheroid-shaped metal-poor halo.

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Two of the most Metal-deficient Stars

Cited by 3 publications

References 10 publications

Very massive stars: Evolution with mass loss

Very massive stars: Evolution with mass loss

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The Pristine survey

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