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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 13808 Sensitive differential S value (Sdiff) for
planet search program stars
table2.dat 129 1205 Measured and derived quantities for all stars
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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 σSdiff_/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 [1] Flag on log(R'HK), PRot, & log(Age) (4)
99-130 A32 --- Note Additional notes (5)
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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.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 02-Jul-2004