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HD 2945


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X-ray studies of coeval star samples. II - The Pleiades cluster as observed with the Einstein Observatory
Coronal X-ray emission of the Pleiades stars is investigated, andmaximum likelihood, integral X-ray luminosity functions are computed forPleiades members in selected color-index ranges. A detailed search isconducted for long-term variability in the X-ray emission of those starsobserved more than once. An overall comparison of the survey resultswith those of previous surveys confirms the ubiquity of X-ray emissionin the Pleiades cluster stars and its higher rate of emission withrespect to older stars. It is found that the X-ray emission from dA andearly dF stars cannot be proven to be dissimilar to that of Hyades andfield stars of the same spectral type. The Pleiades cluster members showa real rise of the X-ray luminosity from dA stars to early dF stars.X-ray emission for the young, solarlike Pleiades stars is about twoorders of magnitude more intense than for the nearby solarlike stars.

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观测天体数据

星座:鯨魚座
右阿森松:00h32m36.86s
赤纬:-09°02'02.7"
视星:9.3
右阿森松适当运动:13.8
赤纬适当运动:-0.3
B-T magnitude:9.841
V-T magnitude:9.345

目录:
适当名称   (Edit)
HD 1989HD 2945
TYCHO-2 2000TYC 5269-560-1
USNO-A2.0USNO-A2 0750-00127976
HIPHIP 2569

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