Analysis of Five Double-lined Spectroscopic Eclipsing Binaries Observed with TESS and LAMOST

Lei, Ya-Juan; Li, Guangwei; Zhou, Guiping; Li, Chunqian

doi:10.3847/1538-3881/ac5aa5

Cited by 2 publications

(1 citation statement)

References 59 publications

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“…The secondary eclipse minimum of Star #27 (TIC 142 979 644; 1RXS J120656.2+700754) deviates from the phase 0.5 in Figure 6, so it has an eccentricity. We used formulae 1 and 2 in Lei et al (2022) to calculate its eccentricity (e) and periastron angle (ω). From our calculation, its secondary eclipse phase f 2 = 0.518 (its primary eclipse phase f 1 = 0), and the widths of the primary and secondary eclipses were determined by eye, which are w 1 ∼ 0.0176 and w 2 ∼ 0.018, respectively.…”

Section: Binary and Multiple Systemsmentioning

confidence: 99%

Magnetic Activity and Parameters of 43 Flare Stars in the GWAC Archive

Li¹

2023

Res. Astron. Astrophys.

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In the archive of the Ground Wide Angle Camera (GWAC), we found 43 white light flares from 43 stars, among which, three are sympathetic or homologous flares, and one of them also has a quasi-periodic pulsation with a period of $13.0\pm1.5$ minutes. Among these 43 flare stars, there are 19 new active stars and 41 stars that have available TESS and/or \textit{K2} light curves, from which we found 931 stellar flares. We also obtained rotational or orbital periods of 34 GWAC flare stars, of which 33 are less than 5.4 days, and ephemerides of three eclipsing binaries from these light curves. Combining with low resolution spectra from LAMOST and the Xinglong 2.16m telescope, we found that $L_{\rm H\alpha}/L_{\rm bol}$ are in the saturation region in the rotation activity diagram. From the LAMOST medium-resolution spectrum, we found that Star \#3 (HAT 178-02667) has double H$\alpha$ emissions which imply it is a binary, and two components are both active stars. Thirteen stars have flare frequency distributions (FFDs) from TESS and/or \textit{K2} light curves. These FFDs show that the flares detected by GWAC can occur at a frequency of 0.5 to 9.5\,yr$^{-1}$. The impact of flares on habitable planets was also studied based on these FFDs, and flares from some GWAC flare stars may produce enough energetic flares to destroy ozone layers, but none can trigger prebiotic chemistry on their habitable planets.

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Section: Binary and Multiple Systemsmentioning

confidence: 99%

Magnetic Activity and Parameters of 43 Flare Stars in the GWAC Archive

Li¹

2023

Res. Astron. Astrophys.

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Starspot Activity without Pulsation in the Binary System KIC 5444392 Revisited

Jin,

Fu,

Wang

et al. 2023

Universe

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We revisited the short-period (∼1.5 days) binary system KIC 5444392, which shows quasi-period modulated light variations. Previous studies indicated that these variations might be caused by stellar pulsations. In our work, we used the PHOEBE program, which revealed that this binary is an almost circular (e ≈0.007) detached system with two G-type stars. The masses and radii of the primary and secondary stars were obtained as M1=1.21±0.06M⊙, R1=1.69±0.09R⊙ and M2=1.27±0.06M⊙, R2=1.69±0.09R⊙, respectively. Based on these parameters, the isochrone fitting showed that this system consists of a subgiant and a main-sequence star, whose ages are 3.89−0.34+0.37 Gyr. Neither the primary nor the secondary star is in the mass range of Cepheid and Gamma Dor. Fourier analysis showed that the fitting residuals varied stochastically in a frequency around the orbital frequency, which means that the quasi-periodic signals resulted from starspots rather than stellar pulsation. Similar stellar parameters of both components of KIC 5444392 and the frequency analysis lead us to believe that starspots are in both stars. The autocorrelation analysis on the residuals indicates that the decay timescale of the starspots is about 53 days, and the rotational periods of both stars are very close to the orbital period of the binary. This result adheres to the trend that the decay timescale increases following the rotational frequency. Thus, studying this binary could increase our understanding of the light variations in the binary system.

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Analysis of Five Double-lined Spectroscopic Eclipsing Binaries Observed with TESS and LAMOST

Cited by 2 publications

References 59 publications

Magnetic Activity and Parameters of 43 Flare Stars in the GWAC Archive

Magnetic Activity and Parameters of 43 Flare Stars in the GWAC Archive

Starspot Activity without Pulsation in the Binary System KIC 5444392 Revisited

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