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Absolute Proper Motion and Space Motion of the Globular Cluster M15

Le Campion, J. -F.; Odenkirchen, M.; Geffert, M. +1 more

We have separated cluster members and field stars for stars in a region around the globular cluster M 15. The membership of ultraviolet bright stars of M 15 is discussed. The absolute proper motion of M 15 has been determined with respect to the PPM catalogue. An extragalactic calibration of the proper motions has been performed. The calibration w…

The Quality of Photometric Information in the HIPPARCOS Input Catalog

Casertano, Stefano; Ratnatunga, Kavan U.; Bell, David J. +1 more

Comparison with independent photoelectric photometry is used to assess the quality of magnitudes and colors in the Hipparcos Input Catalog. These magnitudes and colors will play an important role in the luminosity calibration of Hipparcos stars. We conclude that photoelectric photometry, available for about 37 percent of the catalog, is of uniform…