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HD 1861


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Intermediate band photometry of late-type stars. II - Some stellar groups
Observations on the (R, I) system and a modified Stromgren system ofmembers of six stellar groups are used to demonstrate the chemicalhomogeneity of some 70% or 80% of the members assigned to the groups onthe basis of kinematics. The groups discussed are the Hyades, Wolf 630,Arcturus, Groombridge 1830, and Kapteyn's Star Groups as well as ananonymous group of a half dozen subdwarfs with (U, V) near (-150, -320)km/s. Standards for a previously described photometric system areextended, and additional F- and G-type standards for the (R, I) systemare presented. A simple relation is derived for computing the Fe/Habundance ratio for most stars in the corrected (R-I) interval from +0.2to +0.45 magnitude.

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Osservazione e dati astrometrici

Costellazione:Tucano
Ascensione retta:00h22m31.57s
Declinazione:-63°40'39.3"
Magnitudine apparente:9.098
Moto proprio RA:-15.1
Moto proprio Dec:-25.3
B-T magnitude:9.633
V-T magnitude:9.143

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 1861
TYCHO-2 2000TYC 8843-518-1
USNO-A2.0USNO-A2 0225-00100936
HIPHIP 1776

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