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HD 208208


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Late A-type stars: new Strömgren photometric calibrations of absolute magnitudes from HIPPARCOS
Hipparcos trigonometric parallaxes have been used to derive aphotometric absolute magnitude calibration of main-sequence late A-typestars in terms of Strömgren photometric indices - accounting fortemperature, evolution and metallicity effects - and projectedequatorial rotational velocities. The derived calibrations are valid formain-sequence normal A3-A9 and metallic Am stars, showing residuals of0.22 and 0.20 magnitudes, respectively. One of the fitting methods used(BCES) allows the derivation of the observational ZAMS in this spectralrange, showing an excellent accordance with theoretical evolutionarymodels. The evolutionary state of the Am stars is also discussed.Table~A1 is only available in electronic form from CDS via anonymous ftp130.79.128.5, and by e-mail: request to cesca@am.ub.es

A photometric study of wide visual double stars with significant relative proper motion
Photometric observations and uvby H-beta indices of 142 wide visualdouble stars are presented. Calibrations of the indices are used toderive MK class, color excess, absolute magnitude, effectivetemperature, and distance. The results are used to check candidatesdouble stars for the Hipparcos mission for opticity.

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观测天体数据

星座:摩羯座
右阿森松:21h55m01.83s
赤纬:-11°58'12.9"
视星:8.07
距离:154.083 天文距离
右阿森松适当运动:33.6
赤纬适当运动:-1.2
B-T magnitude:8.557
V-T magnitude:8.111

目录:
适当名称   (Edit)
HD 1989HD 208208
TYCHO-2 2000TYC 5797-608-1
USNO-A2.0USNO-A2 0750-21023975
HIPHIP 108180

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