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III/159A    Ca II H and K Measurements Made at MWO (Duncan+ 1991)

Ca II H and K Measurements Made at Mount Wilson Observatory, 1966-1983 Duncan D.K., Vaughan A.H., Wilson O.C., Preston G.W., Frazer J., Lanning H.H., Misch A., Mueller J., Soyumer D., Woodard L., Baliunas S.L., Noyes R.W., Hartmann L.W., Porter A., Zwaan K., Middelkoop F., Rutter R., Mihalas D. <Astrophys. J. Suppl. Ser. 76, 383 (1991)> =1991ApJS...76..383D
ADC_Keywords: Photometry, K-line Description: Summaries are presented of the photoelectric measurements of stellar CaII H and K line intensity made at Mount Wilson Observatory during the years 1966-1983. These results are derived from 65,263 individual observations of 1296 stars. For each star, for each observing season, the maximum, minimum, mean, and variation of the instrumental H and K index "S" are given, as well as a measurement of the accuracy of observation. A total of 3110 seasonal summaries are reported. These observations were obtained with two instruments, HKP-1 and HKP-2. The HKP-2 instrument is a four-channel chopping spectrometer which records counts in 1.09Å FWHM triangular bandpasses centered in the H and K lines as well as in two 20Å reference bandpasses centered on 3901.067 and 4001.067Å. The stellar activity is expressed by the index S defined as S = α (Nh+Nk)/(Nr+Nv) where Nh and Nk are the counts (corrected from background) in the H and K lines, Nr and Nv those in the reference continuum bandpasses, and α is a constant of proportionality used to correct for night-to-night instrumental variations. Higher values of S generally correspond to higher levels of chromospehric activities. Factors which effect the ability to detect stellar activity variations and accurately measure their amplitudes such as the accuracy of the H and K measurements and scattered light contamination are discussed. Relations are given which facilitate intercomparison of "S" values with residual intensities from ordinary spectrophotometry, and for converting measurements to absolute fluxes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file catalog.dat 160 3111 Observational Data
See also: V/76 : Chromospherically Active Binaries (Strassmeier+ 1993) J/A+A/312/221 : Excess CaII H+K emission in active binaries (Montes+, 1996) J/MNRAS/349/1069 : Chromospherically active binaries (Karatas+, 2004) J/A+A/325/1115 : Near-simultaneous ROSAT and Mt Wilson data (Piters+ 1997) J/A+A/423/677 : O-abundances in chromospherically active stars (Morel+ 2004) J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004) J/MNRAS/298/332 : Chromospheric activity-age relation (Rocha-Pinto+ 1998) Byte-by-byte Description of file: catalog.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Star Star Name or Number (default = HD or DM) 12- 15 I4 --- Nobs Number of Observations of S 17- 22 F6.4 --- Smin Minimum S value 24- 29 F6.4 --- Smax Maximum S value 31- 36 F6.4 --- Smean Mean S value (1) 38- 43 F6.4 --- e_Smean Standard deviation on Smean 45- 50 F6.2 % sdS Standard deviation as a percentage 52- 59 F8.1 --- Wmin Minimum weight (2) 61- 68 F8.1 --- Wmean Mean weight (2) 70- 79 A10 "DD/MM/YYYY" Date1 First Date the star was observed 81- 90 A10 "DD/MM/YYYY" Date2 Last Date the star was observed 93-111 A19 --- SName Name recognized by Simbad 113-120 F8.4 deg RAdeg ? Right Ascension (J2000) 122-129 F8.4 deg DEdeg ? Declination (J2000) 131 A1 --- rPos [AUM] Origin of position: A=ASCC-2.5 (I/280) U=UCAC2 (I/289), M=2MASS (II/246) 133-138 F6.3 mag Bmag ? B mag in Johnson system (from ASCC-2.5) 140-145 F6.3 mag Vmag ? V mag in Johnson system (from ASCC-2.5) 147-153 I7 --- ASCC ? [1,2603318] ASCC-2.5 number (Cat. I/280) 155-160 I6 --- HIP ? Hipparcos number (Cat. I/239)
Note (1): the activity index S is the ratio of photon counts in the H and K lines relative to the continuum, see the "Description" section above. Note (2): the weight is zero for the HKP-1 measurements which have been converted to the S scale of HKP-2.
History: * 03-Feb-1994: Version prepared by Joseph Florsch and Francois Ochsenbein (CDS) * 16-Nov-2005: Positions, Simbad identifications, Johnson photometry and ASCC/HIP identifications added by Eric Mamajek (CfA, Cambridge) During this exercise, the following was noted by Eric Mamajek: HD 183491: is presumably "HD 183439B" from Duncan91, 413" binary in WDS HD 192578: is no separate ASCC entry for this star, the data given is for the ASCC data for HD 192577 (is an eclipsing binary). HD 203784: is presumably "HD 203857B" from Duncan91, 362" binary in WDS
(End) Eric Mamajek [CfA, Cambridge], Francois Ochsenbein [CDS] 16-Nov-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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