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HD 221858


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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.

Classification of Population II supergiants and related stars in the Vilnius system
The results of photometric classification in the Vilnius system of 117Population II supergiants, suspected supergiants, and related stars aregiven. Their photometric spectral types, intrinsic color indices (Y-V)0,color excesses E(Y-V), metallicities Fe/H, and absolute magnitudes MVare determined. It is shown that the system allows us to detect the UUHerculis-type supergiants photometrically. The analyzed SRd star samplefalls into two groups of metallicity and luminosity. Our photometricclassification assigns luminosity classes from III to V to 37 F-K starswith /b/ greater than 16 deg classified by Bartaya (1979) from objectiveprism spectra as supergiants.

Catalogue of Metal-Deficient F-Stars to M-Stars - Part One - Stars Classified Spectroscopically - Supplement One
Not Available

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

Three-dimensional calssification of F-M type halo stars in the Vilnius photometric system
Not Available

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Osservazione e dati astrometrici

Costellazione:Scultore
Ascensione retta:23h35m49.03s
Declinazione:-29°56'00.1"
Magnitudine apparente:9.484
Moto proprio RA:43.9
Moto proprio Dec:-35.2
B-T magnitude:10.527
V-T magnitude:9.571

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 221858
TYCHO-2 2000TYC 6986-48-1
USNO-A2.0USNO-A2 0600-44639806
HIPHIP 116453
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