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HD 131157


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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.

The Effect of Metal Abundance on K-Line Absolute Magnitudes
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1968PASP...80..717Y&db_key=AST

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Datos observacionales y astrométricos

Constelación:Boyero
Ascensión Recta:14h51m34.01s
Declinación:+14°45'51.0"
Magnitud Aparente:8.101
Movimiento Propio en Ascensión Recta:91.7
Movimiento Propio en Declinación:-104.3
B-T magnitude:8.88
V-T magnitude:8.166

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 131157
TYCHO-2 2000TYC 924-11-1
USNO-A2.0USNO-A2 0975-07619825

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