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HD 193989


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Physical parameters of pulsating variables with periods between one and three days. I - Photometry and metallicities
Based on a new set of observations in the Walraven VBLUW system,obtained at the European Southern Observatory, La Silla, Chile,Fe/H(VBLU) values of 57 pulsating variables, mostly with periods betweenone and three days,. are determined. The distribution of the metalabundances is shown to be essentially bimodal. All the variables withFe/H ratios of less than -0.4 were classified by Diethelm (1983) as RRdstars. They are identified as the galactic field counterpart of theCepheids in the same period range found in globular clusters.

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관측 및 측정 데이터

별자리:돌고래자리
적경:20h22m37.76s
적위:+18°56'04.5"
가시등급:8.568
적경상의 고유운동:5.8
적위상의 고유운동:-14.1
B-T magnitude:8.674
V-T magnitude:8.577

천체목록:
일반명   (Edit)
HD 1989HD 193989
TYCHO-2 2000TYC 1639-1079-1
USNO-A2.0USNO-A2 1050-17446602

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