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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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Data from ground and space observations (IUE and Einstein Observatories)of Ca2, C4, UV and X-ray emission from late main sequence stars F7-M2are discussed. The relation between rotation and emission in thechromospheres, transition regions, and coronae is examined and comparedto relations derived from previous measurements. It is shown that theLk, L4 and Lx emission luminosities of main stars decrease exponentiallywhen the rotational period increases, regardless of the spectral type ofthe stars. Coefficients in the correlation are found to be in goodagreement with observed power-law relations between C4 and X-rayemission and chromospheric emission. The effect of rotation period ondynamo-generated magnetic field is briefly discussed.
| The dissociation equilibrium of H^- in stellar atmospheres
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1968MNRAS.141..299L&db_key=AST
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Osservazione e dati astrometrici
| Costellazione: | Ofiuco |
| Ascensione retta: | 18h05m24.77s |
| Declinazione: | +01°08'49.8" |
| Magnitudine apparente: | 8.927 |
| Moto proprio RA: | -6.4 |
| Moto proprio Dec: | -14.7 |
| B-T magnitude: | 10.923 |
| V-T magnitude: | 9.092 |
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