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High Dispersion Spectroscopy of Solar-type Superflare Stars. III. Lithium Abundances
Solar and Stellar Astrophysics · Submitted 22 May 2015
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This result indicates that the superflare stars are not only young stars but also old stars like our Sun.
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The abstract, sentence by sentence
We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. Li is a key element to understand the evolution of the stellar convection zone which reflects the age of solar-type stars. We performed the high dispersion spectroscopy of solar-type superflare stars with Subaru/HDS, and confirmed that 34 stars show no evidence of binarity in our previous study. In this study, we derived the Li abundances of these 34 objects. We investigate correlations of Li abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of Li by superflares. We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. As compared with the Li abundance in Hyades cluster which is younger than the Sun, it is suggested that half of the observed stars are younger than Hyades cluster. The measured value of $v \sin i$ (projected rotational velocity) supports those objects are younger than the Sun. However, there are some objects which show the low Li abundance and slowly rotate on the basis of the estimated $v \sin i$ and $P$ (period of brightness variation). This result indicates that the superflare stars are not only young stars but also old stars like our Sun. In our observations, we could not find any evidence of Li productions by superflares. Further research on Li isotope abundances of superflare stars would clarify the Li production by stellar flares.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. | contribution 1.00 | 0.86 | 0.04 | asserted 1.00 |
| s1 | Li is a key element to understand the evolution of the stellar convection zone which reflects the age of solar-type stars. | background 1.00 | 0.04 | 0.02 | asserted 1.00 |
| s2 | We performed the high dispersion spectroscopy of solar-type superflare stars with Subaru/HDS, and confirmed that 34 stars show no evidence of binarity in our previous study. | method 0.72 | 0.68 | 0.02 | asserted 1.00 |
| s3 | In this study, we derived the Li abundances of these 34 objects. | contribution 0.94 | 0.96 | 0.03 | asserted 1.00 |
| s4 | We investigate correlations of Li abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of Li by superflares. | contribution 0.93 | 0.52 | 0.04 | asserted 0.45 |
| s5 | We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. | result 1.00 | 0.94 | 0.30 | asserted 1.00 |
| s6 | As compared with the Li abundance in Hyades cluster which is younger than the Sun, it is suggested that half of the observed stars are younger than Hyades cluster. | interpretation 0.88 | 0.70 | 0.14 | hedged possibility 1.00 |
| s7 | The measured value of $v \sin i$ (projected rotational velocity) supports those objects are younger than the Sun. | interpretation 0.52 | 0.84 | 0.07 | asserted 0.84 |
| s8 | However, there are some objects which show the low Li abundance and slowly rotate on the basis of the estimated $v \sin i$ and $P$ (period of brightness variation). | result 0.99 | 0.90 | 0.06 | asserted 1.00 |
| s9 | This result indicates that the superflare stars are not only young stars but also old stars like our Sun. | interpretation 0.98 | 0.82 | 0.31 | hedged possibility 0.93 |
| s10 | In our observations, we could not find any evidence of Li productions by superflares. | result 1.00 | 0.96 | 0.26 | asserted 1.00 |
| s11 | Further research on Li isotope abundances of superflare stars would clarify the Li production by stellar flares. | future work 1.00 | 0.06 | 0.04 | hedged possibility 0.90 |
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The paper
Original abstract
We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. Li is a key element to understand the evolution of the stellar convection zone which reflects the age of solar-type stars. We performed the high dispersion spectroscopy of solar-type superflare stars with Subaru/HDS, and confirmed that 34 stars show no evidence of binarity in our previous study. In this study, we derived the Li abundances of these 34 objects. We investigate correlations of Li abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of Li by superflares. We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. As compared with the Li abundance in Hyades cluster which is younger than the Sun, it is suggested that half of the observed stars are younger than Hyades cluster. The measured value of $v \sin i$ (projected rotational velocity) supports those objects are younger than the Sun. However, there are some objects which show the low Li abundance and slowly rotate on the basis of the estimated $v \sin i$ and $P$ (period of brightness variation). This result indicates that the superflare stars are not only young stars but also old stars like our Sun. In our observations, we could not find any evidence of Li productions by superflares. Further research on Li isotope abundances of superflare stars would clarify the Li production by stellar flares.
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