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HD 57109


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관련 글

Empirical temperature calibrations for early-type stars
Three temperature calibrations of suitable photometric quantities havebeen derived for O and B stars. A sample of 120 stars with reliableT(eff.) determinations has been used for establishing each calibration.The different calibrations have been critically discussed and compared.Temperature determinations for 1009 program stars have been obtainedwith an accuracy of the order of 10 percent.

E(B-V) determination from an UV-visual two-colour diagram - O and B stars in the Catalogue of Stellar Ultraviolet Fluxes
For the O and B type stars in the Catalogue of Stellar UltravioletFluxes, an approach is presented which does not require a preciseknowledge of spectral type and luminosity class for deriving E(B-V)color excesses. The method is based on the use of an UV-visual two-colordiagram; galactic variations in the interstellar extinction law areanalyzed and fully taken into account. The results have been comparedwith those derived by using the differences between observed andintrinsic colors for stars with known spectral classification. The verygood agreement in a large number of cases (94 percent) demonstrates thatthe present approach permits the derivation of reliable color excessvalues for early-type stars even if only a rough spectral classificationis available.

Vitesses radiales dans 4 champs de petite latitude galactique.
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관측 및 측정 데이터

별자리:쌍둥이자리
적경:07h20m16.48s
적위:+14°13'20.6"
가시등급:9.116
적경상의 고유운동:-3.3
적위상의 고유운동:-3.3
B-T magnitude:9.019
V-T magnitude:9.108

천체목록:
일반명   (Edit)
HD 1989HD 57109
TYCHO-2 2000TYC 775-452-1
USNO-A2.0USNO-A2 0975-04984383

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