J/A+A/661/A24 Corona-chromosphere connection (Fuhrmeister+, 2022)
The corona-chromosphere connection studied with simultaneous eROSITA and
TIGRE observations.
Fuhrmeister B., Czesla S., Robrade J., Gonzales-Perez J.N., Schneider C.,
Mittag M., Schmitt J.H.M.M.
<Astron. Astrophys. 661, A24 (2022)>
=2022A&A...661A..24F 2022A&A...661A..24F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, M-type ; Stars, F-type ; Spectra, infrared ; X-ray sources
Keywords: stars: activity - stars: chromospheres - stars: coronae - late-type -
X-rays: stars
Abstract:
For a sample of 404 F- to M-type stars we created the largest sample
of simultaneous X-ray and CaII H & K observations of late-type stars
obtained so far to study the correlation between different activity
indicators. We compare X-ray fluxes measured within the first all-sky
survey conducted by the extended ROentgen Survey with an Imaging
Telescope Array (eROSITA) instrument on board the
Spectrum-Roentgen-Gamma (SRG) observatory to CaII H & K excess flux
measurements, using observations made with the robotic TIGRE
telescope.
Description:
We state here the X-ray luminosities derived from the eROSITA
count-rates. The CaII H & K measurements are given as S-index for the
TIGRE telescope, which can be converted to SMountWilson by the
equation given in Mittag et al. (2016A&A...591A..89M 2016A&A...591A..89M). We list the
median value for all CaII H & K measurements and the
pseudo-simultaneous data. For the latter we give the time difference
between the middle of the eROSITA observation and the TIGRE
observation. Rotation period estimates from CaII H & K are computed
following Mittag et al. (2018A&A...618A..48M 2018A&A...618A..48M).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 113 404 X-ray and CaII H & K measurements
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See also:
J/A+A/661/A1 : The eFEDS X-ray catalogs (V7.4) (Brunner+, 2022)
J/A+A/661/A2 : Galaxy clusters and groups in eFEDS (Liu+, 2022)
J/A+A/661/A3 : eFEDS counterparts to point-like sources (Salvato+, 2022)
J/A+A/661/A4 : eFEDS optical cluster and group catalog (Klein+, 2022)
J/A+A/661/A5 : The eFEDS AGN catalog (Liu+, 2022)
J/A+A/661/A7 : X-ray properties of eFEDS clusters and groups (Bahar+, 2022)
J/A+A/661/A8 : eFEDS catalogue of variable X-ray sources (Boller+, 2022)
J/A+A/661/A10 : eFEDS galaxy clusters and groups in disguise (Bulbul+, 2022)
J/A+A/661/A23 : Exoplanet X-ray irradiation & evaporation rates (Foster+, 2022)
J/A+A/661/A29 : First eROSITA study of nearby M dwarfs (Magaudda+, 2022)
J/A+A/661/A34 : eta Cha cluster eROSITA X-ray scan (Robrade+, 2022)
J/A+A/661/A35 : eROSITA study of 47 Tuc globular cluster (Saeedi+, 2022)
J/A+A/661/A38 : SRG/ART-XC 1st year all-sky X-ray survey (Pavlinsky+, 2022)
J/A+A/661/A40 : eRASS1 X-ray sources Sco-Cen members (Schmitt+, 2022)
J/A+A/661/A44 : A first eROSITA view of ultracool dwarfs (Stelzer+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name of the star
12- 16 F5.2 mag B-V B-V colour index
18- 24 F7.3 --- log(LX/Lbol) X-ray to bolometric luminosity
26- 31 F6.3 --- e_log(LX/Lbol) X-ray to bolometric luminosity error
33- 40 F8.3 0.1pm STigre S-index for TIGRE telescope
42- 47 F6.3 0.1pm e_STigre S-index for TIGRE telescope error
49- 56 F8.3 0.1pm STigresim S-index for simultaneous data
58- 63 F6.3 0.1pm e_STigresim S-index simultaneous data error
65- 70 F6.3 --- log(R+) CaII H & K excess flux
72- 76 F5.3 --- e_log(R+) CaII H & K excess flux error
78- 83 F6.3 --- log(R+sim) Ca H & K simultaneous excess flux
85- 89 F5.3 --- e_log(R+sim) Ca H & K simult. excess flux error
91- 96 F6.3 d Tdiff Time difference between X-ray and
chromospheric measurement
98-103 F6.3 d Protlit ?=0 Rotation period from literature
105-111 F7.3 d Protcomp ?=0 Rotation period obtained from R+
113 I1 --- valid [0/1] 1 when star in 'valid' sub-sample
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Acknowledgements:
Birgit Fuhrmeister, bfuhrmeister(at)hs.uni-hamburg.de
References:
The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the
SRG mission, 2022, A&A, 661, A1-A46
(End) B. Fuhrmeister [Hamburg Univ., Germany], P. Vannier [CDS] 24-Jun-2021