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HD 74722


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An unbiased X-ray sampling of stars within 25 parsecs of the sun
A search of all of the Einstein Laboratory IPC and HRI fields foruntargeted stars in the Woolley, et al., Catalogue of the nearby starsis reported. Optical data and IPC coordinates, flux densityFx, and luminosity Lx, or upper limits, aretabulated for 126 single or blended systems, and HRI results for a fewof them. IPC luminosity functions are derived for the systems, for 193individual stars in the systems (with Lx shared equally amongblended components), and for 63 individual M dwarfs. These stars haverelatively large X-ray flux densities that are free of interstellarextinction, because they are nearby, but they are otherwise unbiasedwith respect to the X-ray properties that are found in a defined smallspace around the sun.

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观测天体数据

星座:長蛇座
右阿森松:08h45m46.71s
赤纬:+05°40'48.1"
视星:9.478
右阿森松适当运动:-7.8
赤纬适当运动:-2.6
B-T magnitude:9.702
V-T magnitude:9.497

目录:
适当名称   (Edit)
HD 1989HD 74722
TYCHO-2 2000TYC 224-261-1
USNO-A2.0USNO-A2 0900-06139803

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