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HD 157415


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Classification of Population II Stars in the Vilnius Photometric System. I. Methods
The methods used for classification of Population II stars in theVilnius photometric system are described. An extensive set of standardswith known astrophysical parameters compiled from the literature sourcesis given. These standard stars are classified in the Vilnius photometricsystem using the methods described. The accuracy of classification isevaluated by a comparison of the astrophysical parameters derived fromthe Vilnius photometric system with those estimated from spectroscopicstudies as well as from photometric data in other systems. For dwarfsand subdwarfs, we find a satisfactory agreement between our reddeningsand those estimated in the uvbyscriptstyle beta system. The standarddeviation of [Fe/H] deter mined in the Vilnius system is about 0.2 dex.The absolute magnitude for dwarfs and subdwarfs is estimated with anaccuracy of scriptstyle <=0.5 mag.

The southern Vilnius photometric system. I - Transformation to the standard system
This paper is the first in a series on the extension of the Vilniusphotometric system to the southern hemisphere. Observations of a commonset of 73 stars measured in both hemispheres are described and ananalysis of the differences is given.

Search for stars with intrinsic polarization.
Not Available

Determination of effective temperatures and surface gravities of metal-deficient K-G giants in the Vilnius photometric system
Not Available

Three-dimensional classification of 78 metal-deficient giants in the Vinius photometric system
Not Available

Metal-Deficient Giants in the Galactic Field - Catalogue and Some Physical Parameters
Not Available

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Osservazione e dati astrometrici

Costellazione:Ofiuco
Ascensione retta:17h23m02.13s
Declinazione:+00°50'25.9"
Magnitudine apparente:7.755
Distanza:175.439 parsec
Moto proprio RA:6.1
Moto proprio Dec:13
B-T magnitude:9.337
V-T magnitude:7.886

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 157415
TYCHO-2 2000TYC 401-951-1
USNO-A2.0USNO-A2 0900-09696951
HIPHIP 85060
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