Photovisual magnitude differences of double stars
نویسندگان
چکیده
منابع مشابه
The Absolute Magnitude of Field Metal-poor Horizontal Branch Stars
HIPPARCOS satellite parallaxes for 22 metal-poor field horizontal branch stars with V0 < 9 are used to derive their absolute magnitude. The weighted mean value is MV = +0.69± 0.10 for an average metallicity of [Fe/H]=−1.41; a somewhat brighter average magnitude of MV = +0.60± 0.12 for an average metallicity of [Fe/H]=−1.51 is obtained eliminating HD17072, that might be on the first ascent of th...
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In this paper we shall prove and sharpen a conjecture of A. Bialostocki on anti-Ramsey colorings of the complete graph Kn. Assume the edges of a Kn are colored by t colors. The basic question is how many colors ensure that Kn has a spanning subtree of diameter at most d in which each edge has a different color. The surprising fact is that the answers are the same for every d ≥ 3. Moreover, we c...
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ژورنال
عنوان ژورنال: Astrophysics and Space Science
سال: 1971
ISSN: 0004-640X,1572-946X
DOI: 10.1007/bf02385037