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Fig. 3.

image

Four-parameter association with the Orphan stream defined by the sample of RR Lyrae stars from Koposov et al. (2019, denoted by light blue crosses) based on the spatial and astrometric properties of the studied sample. The RR Lyrae stars associated with the Orphan stream (with a lower significance threshold set at 0.05) are color-coded based on the conditional probability p(A|B). Gray dots represent rejected RR Lyrae stars from our sample. Black lines and gray regions denote the GP fit to the reference sample and confidence intervals of a given interpolation, respectively. The metallicity of each star associated with the Orphan stream is depicted by varying its point size. The error bars in the left corners represent the 15.9, 50, and 84.1 percentiles of individual parameter uncertainties for the RR Lyrae variables linked with the Orphan stream.

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