X-Ray Emission from the Direction of Scorpius.

Abstract

view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Emission from the Direction of Scorpius. Bowyer, S. ; Byram, E. T. ; Chubb, T. A. ; Friedman, H. Abstract A collimated, large-area proportional counter was flown in an Aerobee rocket from White Sands, New Mexico, on 29 April 1963 to scan the night sky for soft x-ray emission. The detector was equipped with a beryllium window, 86 cm2 in area and 5 mil thick. A honeycomb collimator covered the entire window area and restricted the field of view to 8 deg at half-maximum. A strong source was observed centered about the direction R.A. l6h10m and Dec. 180 in the general proximity of ~ Scorpii. Its extent did not exceed the field of view but it appears to be an extended source. From the pulse amplitude distribution, the emission was found to occur primarily in the 3-8 A range. Assuming all the emission to be concentrated at about S A, the computed flux is about 1.5X10-7 erg cm-2 sec-i. Radial Velocities of Southern OB Stars. WILLIAM Busco~~~, Mount Stromlo Observatory.-Mount Stromlo Mimeogram No. 7 has been compiled as a supplement to the recent catalogue of kinematical data for O-B5 stars (Rubin, V. C. et al., Astron. J. 67, 491,1962). Among the 776 entries are 357 stars which are more than 110 away from the (new) galactic equator, 40 stars for which data not used in the previous list indicate significantly different mean velocity or distance modulus, and 379 stars in low latitudes for which new data have recently become available. Spectrum-luminosity classes on the M K system and photoelectric measures of color excess are available for about two-thirds of the stars listed. If new data from northern observatories were similarly treated, the total list of radial velocities would represent more than 2500 stars of classes O-B5, almost equally divided between the celestial hemispheres. Working copies are available in limited supply. Publication: The Astronomical Journal Pub Date: 1964 DOI: 10.1086/109364 Bibcode: 1964AJ.....69Q.135B full text sources ADS |