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CA II H and K measurements made at Mount Wilson Observatory, 1966-1983
Summaries are presented of the photoelectric measurements of stellar CaII H and K line intensity made at Mount Wilson Observatory during theyears 1966-1983. These results are derived from 65,263 individualobservations of 1296 stars. For each star, for each observing season,the maximum, minimum, mean, and variation of the instrumental H and Kindex 'S' are given, as well as a measurement of the accuracy ofobservation. A total of 3110 seasonal summaries are reported. Factorswhich affect the ability to detect stellar activity variations andaccurately measure their amplitudes, such as the accuracy of the H and Kmeasurements and scattered light contamination, are discussed. Relationsare given which facilitate intercomparison of 'S' values with residualintensities derived from ordinary spectrophotometry, and for convertingmeasurements to absolute fluxes.
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Observation and Astrometry data
| Constellation: | Ophiucus |
| Right ascension: | 17h00m08.07s |
| Declination: | -16°38'42.3" |
| Apparent magnitude: | 8.458 |
| Distance: | 408.163 parsecs |
| Proper motion RA: | -9.1 |
| Proper motion Dec: | -2.7 |
| B-T magnitude: | 10.437 |
| V-T magnitude: | 8.622 |
Catalogs and designations:
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