X-ray emission from chemically peculiar stars

Abstract

view Abstract Citations (42) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Emission from Chemically Peculiar Stars Drake, S. A. ; Linsky, J. L. ; Schmitt, J. H. M. M. ; Rosso, C. Abstract We have searched the Roentgen Satellite (ROSAT) All-Sky Survey (RASS) database at the positions of about 100 magnetic Bp-Ap stars of the helium-strong, helium-weak, silicon, and strontium-chromium subclasses. We detect X-ray sources at the positions of 10 of these stars; in four cases the X-ray emission presumably arises from an early-type companion with a radiatively driven wind, while we believe that the magnetic chemically peculiar (CP) star is the most likely X-ray source (as opposed to a binary companion) in at least three and at most five of the six remaining cases. The helium-strong stars have X-ray emission levels that are characteristic of the luminous OB stars with massive winds (log Lx/Lbol is about -7), whereas the He-weak and Si stars (which generally show no evidence for significant mass loss) have log Lx/Lbol values that can reach as high as about -6. In contrast, we find no convincing evidence that the cooler SrCrEu-type CP stars are intrinsic X-ray sources. We discuss the X-ray and radio emission properties of our sample of CP stars, and argue that both types of emission may be magnetospheric in origin; however, there is clearly not a simple one-to-one correspondence between them, since many of the magnetic stars that are detected radio sources were not detected as X-ray sources in the present survey. Publication: The Astrophysical Journal Pub Date: January 1994 DOI: 10.1086/173568 Bibcode: 1994ApJ...420..387D Keywords: Helium; Interstellar Chemistry; Peculiar Stars; Radio Emission; X Ray Stars; Binary Stars; Magnetic Stars; Sky Surveys (Astronomy); Stellar Luminosity; Astrophysics; STARS: PECULIAR; X-RAYS: STARS full text sources ADS | data products SIMBAD (10)