2008A&A...481..229F


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.18CEST09:54:51

2008A&A...481..229F - Astronomy and Astrophysics, volume 481, 229-233 (2008/4-1)

Chromospheric features of LQ Hydrae from Hα line profiles.

FRASCA A., KHOVARI Z., STRASSMEIER K.G. and BIAZZO K.

Abstract (from CDS):

We analyze the Hα spectral variability of the rapidly-rotating K1-dwarf LQHya using high-resolution Hα spectra recorded during April-May 2000. Chromospheric parameters were computed from the Hα profile as a function of rotational phase. We find that all these parameters vary in phase, with a higher chromospheric electron density coinciding with the maximum Hα emission. We find a clear rotational modulation of the Hα emission that is better emphasized by subtracting a reference photospheric template built up with a spectrum of a non-active star of the same spectral type. A geometrical plage model applied to the Hα variation curve allows us to derive the location of the active regions that come out to be close in longitude to the most pronounced photospheric spots found with Doppler imaging applied to the photospheric lines in the same spectra. Our analysis suggests that the Hα features observed in LQ Hya in 2000 are a scaled-up version of the solar plages as regards dimensions and/or flux contrast. No clear indication of chromospheric mass motions emerges.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: late-type - stars: chromospheres - stars: starspots - stars: individual: LQ Hydrae

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 3765 PM* 00 40 49.2699101367 +40 11 13.819725965   8.30   6.8   K2V 234 0
2 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1049 1
3 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 401 0
4 * c Vir PM* 12 20 20.9813348 +03 18 45.260365 7.27 6.12 4.96 4.07 3.46 K0.5IIIbFe-0.5 335 0

    Equat.    Gal    SGal    Ecl

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2020.09.18-09:54:51

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