J/ApJS/152/261 Chromospheric Ca II emission in nearby stars (Wright+, 2004)
Chromospheric Ca II emission in nearby F, G, K, and M stars. Wright J.T., Marcy G.W., Butler R.P., Vogt S.S. <Astrophys. J. Suppl. Ser., 152, 261-295 (2004)> =2004ApJS..152..261W
ADC_Keywords: Stars, nearby ; Stars, atmospheres ; Stars, dwarfs Keywords: stars: activity - stars: chromospheres - stars: rotation Abstract: We present chromospheric CaII H and K activity measurements, rotation periods, and ages for ∼1200 F, G, K, and M type main-sequence stars from ∼18000 archival spectra taken at Keck and Lick Observatories as a part of the California and Carnegie Planet Search Project. We have calibrated our chromospheric S-values against the Mount Wilson chromospheric activity data. From these measurements we have calculated median activity levels and derived R'HK, stellar ages, and rotation periods from general parameterizations for 1228 stars, ∼1000 of which have no previously published S-values. We also present precise time series of activity measurements for these stars. Description: Observations for the California and Carnegie Planet Search Program have used the HIRES spectrometer at Keck Observatory for 6 years, measuring precision velocities of ∼700 stars as part of a campaign to find and characterize extrasolar planetary systems. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 13808 Sensitive differential S value (Sdiff) for planet search program stars table2.dat 130 1205 Measured and derived quantities for all stars
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name HD or ADS number 10- 15 I6 --- HIP ? The Hipparcos number 17- 30 A14 --- Other Other name 32- 44 F13.5 d Date Observation date 46- 50 F5.3 --- Sdiff Sensitive differential S value (1) 52- 79 A28 --- Remarks Additional notes (2)
Note (1): The S-values were constructed as S = α(H+K)/(R+V), where H, K, R, and V refer to the flux in the corresponding bandpasses and α was calculated to be 2.4 to make the mean S correspond to the mean F determined from the HKP-1 observations. Note (2): This column contains alternate names for some stars and J2000 Hipparcos coordinates for stars for which only one catalog name is given.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name HD or ADS number 10- 15 I6 --- HIP ? The Hipparcos number 17- 30 A14 --- Other Other name 32- 36 F5.3 mag B-V ? The (B-V) color (1) 38- 42 F5.2 mag VMAG ? Absolute V band magnitude (1) 44- 50 I7 d FObs First observation date used in calculating the grand S value 52- 58 I7 d LObs Last observation date used in calculating the grand S value 60- 62 I3 --- NObs Total number of observations 64- 65 I2 --- NBins Number of month bins used to calculate the grand S value as defined in 5.1.1 67- 71 F5.3 --- GSVal The grand S value (2) 73- 77 F5.2 % Ratio ? The σ_S_diff_/S ratio (3) 79- 83 F5.2 [-] log(R'HK) ? Log of the R'HK activity level 85- 88 F4.1 d Per ? Rotation period 90 A1 --- l_log(Age) Limit flag on log(Age) 91- 95 F5.2 [yr] log(Age) ? Log of the age 97 A1 --- Flag  Flag on log(R'HK), PRot, & log(Age) (4) 99-130 A32 --- Note Additional notes (5)
Note (1): Values are from Hipparcos (Perryman et al., 1997, Cat. I/239), where available. Note (2): The overall uncertainty in the grand S varies from star to star, but we conservatively estimate it to be around 13%, in general (see Sec. 5.1). Note (3): Ratio is the fractional standard deviation of the differential S values for a star (for those stars with Keck data) and measures the star's intrinsic variability. Note (4): Flag as follows: 1: The chromospheric activity relation used to derive this quantity is only calibrated for stars with 0.44<B-V<0.9. Note (5): The note "d8" refers to an entry based solely on Dewar 8 data, for which an the uncertainty of each measurement contributing to the grand S is around 10%. All other entries are based on Keck and Dewar 6 data which have per-measurement uncertainties of around 6%. Alternate names for stars are noted, and J2000 Hipparcos coordinates are given for stars with only one catalog name.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004
|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|