Abstract
DURING a rocket flight on May 26, 1971 which carried a number of large area thin window proportional counters, a soft X-ray source was observed by Bleeker et al.1 in Scorpio. Photons in the energy range 0.37 keV to 1.9 keV were detected from a position error box of approximately 40 square degrees. This admittedly large error box contains the bright star λ-Sco and it was suggested that this object may be the source of the soft X-ray emission that was detected. It is a B1 V star and exhibits a varying radial velocity with a period of about 5.6 d. It has a visual magnitude of 1.62 and its distance is estimated as 100 pc (ref. 2).
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References
Bleeker, J. A. M., Deerenberg, A. J. M., Heise, J., Yamashita, K., and Tanaka, Y., Nature phys. Sci., 241, 55 (1973).
Savage, B. D., and Jenkins, E. B., in The Scientific Results of OAO-2 (NASA SP-310, 1972).
Fabian, A. C., Zarnecki, J. C., and Culhane, J. L., Nature phys. Sci., 241, 18 (1973).
Brown, R, L., and Gould, R. J., Phys. Rev., D1, 2252 (1970).
Hill, R. W., Burginyon, G., Grader, R. J., Palmieri, J. M., Seward, F. D., and Stoering, J. P., Astrophys. J., 171, 519 (1972).
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STRONG, K., COLLEY, M. & CULHANE, J. Upper limit to the flux of soft X rays from λ-Sco. Nature 248, 34–35 (1974). https://doi.org/10.1038/248034a0
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DOI: https://doi.org/10.1038/248034a0
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