INCIDENCE OF X-RAY SOURCES AMONG MAGNETIC CHEMICALLY PECULIAR STARS

Cash & Snow (1982) and Golub et al. (1983) have detected X-ray emission from 3 out of 7 observed magnetic chemically peculiar (CP) stars. Although the incidence of X-ray sources apparently is very high, these authors concluded that such emission is not unquestionable because of the presence of a companion. To determine the incidence of X-ray sources among hot CP stars, I have checked the list of B-type stars measured by Grillo et al. (1992) selecting 90 stars. Of the 4 magnetic CP stars showing X-ray emission 3 are members of a binary system. Thus it appears that detectable X-ray emission from magnetic CP stars is not very common and still questionable. To find out whether HD 37017 presents X-ray emission (Drake et al. 1987) or not (Grillo et al. 1992), I have analysed an HRI frame from the ROSAT satellite finding no evidence for X-ray emission at this star's position.