J/A+A/575/A57 LQ Hya activity and Li variations (Flores Soriano+, 2015)
Chromospheric activity and lithium line variations in the spectra of the spotted
star LQ Hydrae.
Flores Soriano M., Strassmeier K. G., Weber M.
<Astron. Astrophys. 575, A57 (2015)>
=2015A&A...575A..57F 2015A&A...575A..57F
ADC_Keywords: Stars, variable ; Abundances ; Effective temperatures ;
Equivalent widths
Keywords: stars: abundances - stars: activity - stars: chromospheres -
stars: flare - stars: rotation - stars: individual: LQ Hydrae
Abstract:
We study the rotational modulation of chromospheric and photospheric
parameters of the young, active, single K2 dwarf LQ Hya and their
connection with the variability of the LiI 670.8nm line.
A total of 199 high-resolution STELLA spectra were used to compute
effective temperature, gravity, and chromospheric activity indicators
like Hα and Hβ emission, Balmer decrement, and
chromospheric electron density, as a function of the rotational phase.
The variation of the LiI 670.8nm line were characterized in terms of
equivalent width, abundance, and of 6Li/7Li isotopic ratio in the
form of line shifts.
Description:
We preset in these two tables the observing log and the numerical
results of the spectral analysis of LQ Hya. They are a tabular version
of the results shown in the figures of the paper.
Objects:
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RA (2000) DE Designation(s)
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09 32 25.6 -11 11 05 V* LQ Hya = HD 82558
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
single.dat 156 199 Observation log and measurements over single spectra
average.dat 37 10 Phase-averaged measurements of the electron density
and LiI 670.8nm central wavelength
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See also:
J/A+A/276/345 : Photometry of variable LQ Hya (Jestu 1993)
J/A+A/394/505 : UBV photometry of LQ Hya (Berdyugina+, 2002)
J/A+A/542/A38 : LQ Hya V-band differential light curve (Lehtinen+, 2012)
Byte-by-byte Description of file: single.dat
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Bytes Format Units Label Explanations
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1- 12 F12.3 d HJD Heliocentric Julian Date
13- 18 F6.3 --- Phase [0/1] Rotational phase
19- 22 I4 --- S/N [40/120] Signal to noise ratio
23- 27 I5 K Teff [4949/5030] Effective temperature
28- 30 I3 K e_Teff [2/16] Error of Teff
31- 35 F5.2 [cm/s2] logg [4.54/4.72] Surface gravity
36- 40 F5.2 [cm/s2] e_logg [0.01/0.04] Error of logg
41- 45 F5.2 0.1nm EWHa [0.7/1.9] Equivalent width of Hα (Å)
46- 50 F5.2 0.1nm e_EWHa Error of EWHa
51- 59 E9.3 mW/m2 FHa Chromospheric radiative loss in Hα
60- 67 E8.2 mW/m2 e_FHa Error of FHa
68- 73 F6.3 0.1nm EWHb Equivalent width of Hβ
74- 79 F6.3 0.1nm e_EWHb Error of EWHb
80- 88 E9.3 mW/m2 FHb Chromospheric radiative loss in Hβ
89- 96 E8.2 mW/m2 e_FHb Error of FHb
97-103 F7.3 0.1nm EWHe [-0.01/0.036]? Equivalent width of He D3 (1)
104-110 F7.3 0.1nm e_EWHe [0.006/0.014]? Error EWHeD3 (1)
111-116 F6.3 0.1nm EWLi [0.20/0.25] Equivalent width of LiI 670.8nm
117-122 F6.3 0.1nm e_EWLi [0.005/0.012] Error of EWLi
123-127 F5.2 [-] logNLi [2.5/2.7] Lithium abundance from EWLi,
Teff and logg (logNLi+12)
128-132 F5.2 [-] e_logNLi [0.02/0.06] Error of logNLi
133-138 F6.3 0.1nm EWCaI1 [0.374/0.42] Equivalent width of CaI 643.9nm
139-144 F6.3 0.1nm e_EWCaI1 [0.003/0.01] Error of EWCaI1
145-150 F6.3 0.1nm EWCaI2 [0.214/0.26] Equivalent width of CaI 671.8nm
151-156 F6.3 0.1nm e_EWCaI2 [0.003/0.01] Error of EWCaI2
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Note (1): HeI D3 line (587.56nm), only calculated for spectra with
FHa<4.7x10+6mW/m2.
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Byte-by-byte Description of file: average.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 --- Phase [0/1] Central rotational phase φ
of the averaged interval
6- 14 E9.3 cm-3 ne Electron density Ne(φ)
15- 22 E8.2 cm-3 e_ne Error of ne
23- 31 F9.3 0.1nm lam.c [6707.819/6707.831] Central wavelength of the
LiI 670.8nm line
32- 37 F6.3 0.1nm e_lam.c Error of central wavelength
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Acknowledgements:
Manuel Flores Soriano, mflores(at)aip.de
(End) Manuel Flores Soriano [AIP], Patricia Vannier [CDS] 21-Jan-2015