J/A+A/616/A108 Cool stars chromospheric activity catalog (Boro Saikia+, 2018)
Chromospheric activity catalogue of 4454 cool stars.
Questioning the active branch of stellar activity cycles.
Boro Saikia S., Marvin C.J., Jeffers S.V., Reiners A., Cameron R.,
Marsden S.C., Petit P., Warnecke J., Yadav A.P.
<Astron. Astrophys. 616, A108 (2018)>
=2018A&A...616A.108B 2018A&A...616A.108B (SIMBAD/NED BibCode)
ADC_Keywords: Fundamental catalog ; Stars, late-type ; Spectroscopy
Keywords: stars: chromosphere - stars: activity - stars: solar-type -
stars: late-type
Abstract:
Chromospheric activity monitoring of a wide range of cool stars can
provide valuable information on stellar magnetic activity and its
dependence on fundamental stellar parameters such as effective
temperature and rotation.
We compile a chromospheric activity catalogue of 4454 cool stars from
a combination of archival HARPS spectra and multiple other surveys,
including the Mount Wilson data that have recently been released by
the NSO. We explore the variation in chromospheric activity of cool
stars along the main sequence for stars with different effective
temperatures. Additionally, we also perform an activity-cycle period
search and investigate its relation with rotation.
The chromospheric activity index, S-index, was measured for 304
main-sequence stars from archived high-resolution HARPS spectra.
Additionally, the measured and archived S-indices were converted into
the chromospheric flux ratio logR'HK. The activity-cycle periods
were determined using the generalised Lomb-Scargle periodogram to
study the active and inactive branches on the
rotation-activity-cycle period plane.
The global sample shows that the bimodality of chromospheric activity,
known as the Vaughan-Preston gap, is not prominent, with a significant
percentage of the stars at an intermediate-activity level around
logR'HK=-4.75. Independently, the cycle period search shows that stars
can lie in the region intermediate between the active and inactive
branch, which means that the active branch is not as clearly distinct
as previously thought.
The weakening of the Vaughan-Preston gap indicates that cool stars
spin down from a higher activity level and settle at a lower activity
level without a sudden break at intermediate activity. Some cycle
periods are close to the solar value between the active and inactive
branch, which suggests that the solar dynamo is most likely a common
case of the stellar dynamo.
Description:
We tabulate chromospheric activity of cool stars determined from CaII
H and K lines. The catalogue is created by combining archival HARPS
spectra (Lovis et al. 2011, Cat. J/A+A/528/112, Bonfils et al.
2013A&A...549A.109B 2013A&A...549A.109B) and multiple other surveys (Baliunas et al.
1995ApJ...438..269B 1995ApJ...438..269B, Duncan et al. 1991ApJS...76..383D 1991ApJS...76..383D, Cat. III/159,
Arriagada et al. 2012, Cat. J/ApJS/200/15, Henry et al. 1996, Cat.
J/AJ/111/439, Gray et al. 2006, Cat. J/AJ/132/161, Hall et al. 2009,
Cat. J/AJ/138/312, Wright et al. 2004, Cat. J/ApJS/152/261, Issacson &
Fischer 2010, Cat. J/ApJ/725/875). The stellar properties are taken
from HIPPARCOS (Cat. I/239).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 150 6962 Chromospheric activity and stellar parameters
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
III/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991)
J/AJ/111/439 : Chromospheric emission in late-type stars. (Henry+ 1996)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/AJ/132/161 : NStars project: The southern sample. I. (Gray+, 2006)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/A+A/528/A112 : Radial velocities of HD 10180 (Lovis+, 2011)
J/ApJS/200/15 : HARPS-TERRA project. I. (Anglada-Escude+, 2012)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [0/6961] Sequential number
6- 14 A9 --- Name Name
16- 35 A20 --- SpType MK spectral type
37- 50 F14.11 mag B-V B-V colour index
52- 63 F12.8 deg RAdeg ? Right ascension (ICRS)
65- 76 F12.8 deg DEdeg ? Declination (ICRS)
78- 92 F15.12 mag VMAG Absolute V magnitude
94- 99 F6.2 mas Plx ? Parallax
101-117 F17.13 --- Smean ? Mean S-index
119-135 F17.13 --- Smed ? Median S-index
137-150 F14.11 --- logRpHK ? R'HK index
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Acknowledgements:
Sudeshna Boro Saikia, sudeshna.boro.saikia(at)univie.ac.at
(End) Patricia Vannier [CDS] 10-Aug-2018