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HD 183711


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Inaccuracies in the spectral classification of stars from the Tycho-2 Spectral Type Catalogue
We compare the spectroscopic and trigonometric parallaxes of commonstars from the Tycho-2 Spectral Type and Hipparcos Catalogues. Thiscomparison has revealed that the distance estimations for theoverwhelming majority of stars by both methods yield very similarresults. However, there is a small fraction of stars for which thedistance estimates differ significantly. It is these stars that are thesubject of our study. We have been able to find the causes of thesedifferences.

New periodic variables from the Hipparcos epoch photometry
Two selection statistics are used to extract new candidate periodicvariables from the epoch photometry of the Hipparcos catalogue. Theprimary selection criterion is a signal-to-noise ratio. The dependenceof this statistic on the number of observations is calibrated usingabout 30000 randomly permuted Hipparcos data sets. A significance levelof 0.1 per cent is used to extract a first batch of candidate variables.The second criterion requires that the optimal frequency be unaffectedif the data are de-trended by low-order polynomials. We find 2675 newcandidate periodic variables, of which the majority (2082) are from theHipparcos`unsolved' variables. Potential problems with theinterpretation of the data (e.g. aliasing) are discussed.

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Datos observacionales y astrométricos

Constelación:Sagitario
Ascensión Recta:19h31m25.11s
Declinación:-13°58'41.2"
Magnitud Aparente:8.746
Distancia:182.149 parsecs
Movimiento Propio en Ascensión Recta:18.8
Movimiento Propio en Declinación:-6.5
B-T magnitude:10.559
V-T magnitude:8.896

Catálogos y designaciones:
Nombres Propios
HD 1989HD 183711
TYCHO-2 2000TYC 5734-680-1
USNO-A2.0USNO-A2 0750-18314890
HIPHIP 96022

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