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A Fast Chi-Squared Technique for Period Search of Irregularly Sampled Data
A new, computationally and statistically efficient algorithm, the Fast?2 algorithm (F?2), can find a periodicsignal with harmonic content in irregularly sampled data with nonuniformerrors. The algorithm calculates the minimized ?2 as afunction of frequency at the desired number of harmonics, using fastFourier transforms to provide O(Nlog N) performance. The code for areference implementation is provided.
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About 4000 X-ray images obtained with the Einstein Observatory are usedto measure the 0.16-4.0 keV emission from 1545 B-type SAO stars fallingin the about 10 percent of the sky surveyed with the IPC. Seventy-fourdetected X-ray sources with B-type stars are identified, and it isestimated that no more than 15 can be misidentified. Upper limits to theX-ray emission of the remaining stars are presented. In addition tosummarizing the X-ray measurements and giving other relevant opticaldata, the present extensive catalog discusses the reduction process andanalyzes selection effects associated with both SAO catalog completenessand IPC target selection procedures. It is concluded that X-rayemission, at the level of Lx not less than 10 exp 30 ergs/s, is quitecommon in B stars of early spectral types (B0-B3), regardless ofluminosity class, but that emission, at the same level, becomes lesscommon, or nonexistent, in later B-type stars.
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...41...85L&db_key=AST
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