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HD 139913


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The calibration of the Stromgren photometric system for A, F and early G supergiants. I - The observational data
An empirical calibration of the Stromgren uvby-beta photometric systemfor the A, F, and early G supergiants is being derived. This paperexplains the observational program and the photometric reductiontechniques used and presents a catalog of new Stromgren photometry forover 600 A, F, and G supergiants.

Local photometric standards for CaII emission stars
UBV data are given for 108 stars which are suitable local standards for52 stars with strong Ca2 emissions. An additional eight stars wererejected as possible standards because of suspected variability.

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观测天体数据

星座:矩尺座
右阿森松:15h43m40.35s
赤纬:-57°27'07.4"
视星:7.249
距离:33333.333 天文距离
右阿森松适当运动:0.8
赤纬适当运动:-2.8
B-T magnitude:7.737
V-T magnitude:7.29

目录:
适当名称
HD 1989HD 139913
TYCHO-2 2000TYC 8704-2420-1
USNO-A2.0USNO-A2 0300-24436957
HIPHIP 77029
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