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Identification of young nearby runaway stars based on Gaia data and the lithium test†
Torres, Guillermo; Mugrauer, Markus; Lux, Oliver +6 more
Young nearby runaway stars are suitable to search for their place of origin and possibly associated objects, for example, neutron stars. Tetzlaff et al. (2011) selected young (≤50 Myr) runaway star candidates from Hipparcos, for which they had estimated the ages from the location in the Hertzsprung-Russell diagram and evolutionary models. Here, we…
Accuracy of magnitudes in pre‑telescopic star catalogs
Hoffmann, Susanne M.; Protte, Philipp
Historical star magnitudes from catalogs by Ptolemy (137 AD), al‑Sūfī (964), and Tycho Brahe (1602/27) are converted to the Johnson V‑mag scale and compared to modern‑day values from the HIPPARCOS catalog. The deviations (or "errors") are tested for dependencies on three different observational influences. The relation between historical and moder…
Latitude observations of the last century to obtain accurate independent latitude stations (INDLS) catalog of µδ for 682 Hipparcos stars and comparison with Gaia DR2
Damljanović, Goran
The independent latitude stations (INDLS) catalog of proper motion in declination µδ for 682 bright Hipparcos (HIP) stars is presented. It is obtained in the Hipparcos reference frame, and only the Hipparcos mean position at epoch 1991.25 is used for INDLS data to calculate independent µδ (the HIP µδ values are not included in th…