Investigation on Doppler imaging and chromospheric activity of the young dwarf LQ Hya based on high-resolution spectroscopy
Abstract
We have obtained four Doppler images of LQ Hya in 2005 November–December, 2006 November–December, 2008 November, and 2014 January–February using high-resolution spectra obtained at three different observing sites. All of the surface maps show that the spots of LQ Hya are in bimodal distribution, i.e., in polar/high-latitude and low-latitude regions. Its chromospheric activity indicators exhibit obvious rotational modulations that are correlated with the simultaneous light curves, except in 2008. The correspondence between the maximum value of chromospheric emission and the low-latitude spot of new reconstructed image is clear, which indicates that both of them are driven by homologous magnetic field. The variation of Hα emission over a long time span suggests that the chromospheric plages may implicate a similar active cycle as photospheric spots.
Citation
Luo , X , Gu , S , Xiang , Y , Collier Cameron , A , Kim , K-M , Han , I & Lee , B-C 2022 , ' Investigation on Doppler imaging and chromospheric activity of the young dwarf LQ Hya based on high-resolution spectroscopy ' , Astronomical Journal , vol. 163 , no. 6 , 287 . https://doi.org/10.3847/1538-3881/ac6954
Publication
Astronomical Journal
Status
Peer reviewed
ISSN
0004-6256Type
Journal article
Description
Funding: This study is supported by the National Natural Science Foundation of China under grants Nos. 10373023, 10773027, U1531121, 11603068, and 11903074. We acknowledge the science research grant from the China Manned Space Project with NO. CMS-CSST-2021-B07. This work is partially supported by the Open Project Program of the Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences.Collections
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