Abstract
We calculated the median parallaxes for 47 OB associations including at least 10 stars with known Gaia DR2 parallaxes. A comparison between trigonometric and photometric parallaxes of OB associations reveals a zero-point offset of \(\Delta \varpi=-0.11\pm0.04\) mas indicating that Gaia DR2 parallaxes are, on average, underestimated and the distances derived from them are overestimated. The correction of \(\Delta \varpi=-0.11\) mas is consistent with the estimate that Arenou et al. (2018) obtained for bright stars. An analysis of parallaxes of OB associations and high-luminosity field stars confirms our previous conclusion (Dambis et al. 2001) that the distance scale for OB stars established by Blaha and Humphreys (1989) must be reduced by 10–20%. Spurious systematic motions of 10–20 km s−1 at the distances of 2–3 kpc from the Sun are found to arise from the use of the uncorrected Gaia DR2 parallaxes.
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Acknowledgements
We thank the anonymous referee and the Editor for useful remarks and suggestions. This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published by Ochsenbein et al. (1997). A. K. acknowledges the support from the Russian Foundation for Basic Research (project nos. 18-02-00890 and 19-02-00611).
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Melnik, A.M., Dambis, A.K. Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions. Astrophys Space Sci 365, 112 (2020). https://doi.org/10.1007/s10509-020-03827-0
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DOI: https://doi.org/10.1007/s10509-020-03827-0