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Characteristics of the Two Sequences Seen in the High-velocity Hertzsprung-Russell Diagram in Gaia DR2

Sahlholdt, Christian L.; Casagrande, Luca; Feltzing, Sofia


In this study we use a sample of about 9 million SkyMapper stars with metallicities to investigate the properties of the two stellar populations seen in the high-velocity (V T > 200 km s−1) Gaia DR2 Hertzsprung-Russell diagram. Based on 10,000 red giant branch (RGB) stars (out of 75,000 with high velocity), we find that the two sequences have different metallicity distribution functions; one peaks at −1.4 dex (blue sequence) and the other at −0.7 dex (red sequence). Isochrones with ages in the...[Show more]

CollectionsANU Research Publications
Date published: 2019-08-06
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.3847/2041-8213/ab321e


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