Search Publications
Measurements of visual double stars with PISCO2 at the Nice 76‑cm refractor in 2013–2014 (new data) and in 2015
Vakili, F.; Rivet, J. -P.; Ling, J. F. +11 more
We present relative astrometric and photometric measurements of visual double stars made in 2013–2015, with PISCO2 installed at the 76‑cm refractor of Côte d'Azur Observatory in Nice (France). Our observing list contains orbital couples as well as double stars whose motion is still uncertain. Most of the observations were done in 2015, but some ot…
Studies of FCAPT UVBY photometry for the mCP stars HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358
Adelman, Saul J.; Wittman, Todd; Dukes, Robert J., Jr.
We present differential Strömgren uvby observations from the Four College Automated Photometric Telescope (FCAPT) in Washington Camp, AZ of eight magnetic Chemically Peculiar (mCP) stars: HD 32966, HD 35298, HD 68292, HD 93226, HD 171247, HD 217833, HD 220147, and HD 223358. We use multiple period‑finding algorithms and incorporate data from the E…
Rectilinear elements of visual optical double stars: With application to the 1829 southern double star catalogue of James Dunlop
Letchford, Roderick R.; White, Graeme L.; Brown, Carolyn J.
The relative Rectilinear motion of optical double stars provides an important clue to the relationship of the components. We provide an objective method of confirming the optical status of double stars, and of obtaining unbiased rectilinear elements solely on data obtained from the HIPPARCOS and Gaia DR2 space missions. We apply this technique to …
Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
Torres, Guillermo; Mugrauer, Markus; Michel, Kai-Uwe +4 more
Runaway stars are characterized by their remarkably high space velocities, and the study of their formation mechanisms has attracted considerable interest. Young, nearby runaway stars are the most favorable for identifying their place of origin, and for searching for possible associated objects such as neutron stars. Usually, the research field of…
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…
Catalog of equatorial coordinates and B‑magnitudes of the Kitab's part of the FON project
Andruk, V.; Yuldoshev, Q.; Relke, H. +3 more
We present a catalog of stars with equatorial coordinates α and δ and B‑magnitudes of stars for the Kitab's section of the FON project (FON‑Kitab). The photographic plates of the FON project were exposed on the double telescope Double Zeiss Astrograph (DAZ, D/F = 40/300, 69″/mm) at the Kitab observatory of the Republic of Uzbekistan. A total of 19…
Intrinsic colour indices of Be stars obtained from 2MASS photometry
Wegner, W.
This paper is based on 2MASS photometry (JHK_s magnitudes) of 1172 Be stars. The observed mean intrinsic colours have been derived with aid of two-colour diagrams for Be stars of luminosity classes Ie-IIe, IIIe and IVe-Ve. The obtained results are the first determinations of their intrinsic colours in the astronomical literature. The smoothed infr…
The spectroscopic orbit of the K-giant binary γ Canis Minoris
Strassmeier, K. G.; Weber, M.; Pourbaix, D. +2 more
We have determined an improved orbit for the bright, evolved, double lined binary γ Canis Minoris. The system has an orbital period of 389.31 days and an eccentricity of 0.2586. We have revised the secondary to primary mass ratio to 0.987. The spectral types of the primary and secondary are K4 III and K1: III, respectively, and the components have…