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tokens: Acknowledgments We thank the referee for their comments that helped us to clarify and improve this paper. We have used DSS scans in this paper. Based on photographic data of the National Geographic Society–Palomar Observatory Sky Survey (NGS-POSS) obtained using the Oschin Telescope on Palomar Mountain. The NGS-POSS was funded by a grant from the National Geographic Society to the California Institute of Technology. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France.