Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems

Li, Kai; Gao, Xiang; Liu, Xin-Yi; Gao, Xing; Ling-Zhi, Li,; Chen, Xu; Sun, G.

doi:10.3847/1538-3881/ac8ff2

Cited by 33 publications

(14 citation statements)

References 66 publications

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“…It makes the binary system have a lower angular momentum and initial orbital period, which accelerates the orbital evolution of the system. DLMRCBs are in the late evolutionary stage of contact binaries, which have lower orbital angular momentum compared to other contact binaries of the same mass (e.g., Qian et al 2006a;Li et al 2022). NY Boo is a DLMRCB with a long-term reduced orbital period.…”

Section: Discussionmentioning

confidence: 99%

NY Bootes: An Active Deep and Low-mass-ratio Contact Binary with a Cool Companion in a Hierarchical Triple System

Meng,

Zhu,

Qian

et al. 2023

ApJ

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The first detailed photometric and spectroscopic study of G-type short-period binary NY Boo is presented. The radial velocity curve was obtained by the cross-correlation function (CCF) method based on LAMOST and SDSS spectra, which derived its mass ratio as q = 0.139(1/7.2). The CCF profiles of the SDSS spectra clearly show the existence of a cool third component, which is supported by the results of the orbital period investigation. The period study based on the O-C analysis indicates that besides a long-term decrease, the orbital period has a periodic oscillation due to the light-travel time effect caused by a third body. When the third light contribution is consistent with the CCF results, the orbit of the third body and the inner pair are non-coplanar with m 3 = 0.31 M ⊙. Combining with the TESS light curves, it is found that the target is a deep and low-mass-ratio contact binary (DLMRCB) with a fill-out factor of f = 73%. The notable asymmetry in light curves was detected and explained by the spot model very well. The spectroscopic profiles, the cyclic variation in the O-C diagram, and the radial velocity curve and light-curve solutions all suggest that NY Boo is a hierarchical triple system with a cool tertiary component orbiting around an active DLMRCB. With the orbital period shrinking, the binary may eventually merge. The period of NY Boo decreases faster than other shrinking DLMRCB, together with active inner pair and non-coplanar tertiary component, making NY Boo an important target for studying the late evolution of binaries.

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Section: Discussionmentioning

confidence: 99%

NY Bootes: An Active Deep and Low-mass-ratio Contact Binary with a Cool Companion in a Hierarchical Triple System

Meng,

Zhu,

Qian

et al. 2023

ApJ

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“…In recent decades, there have been several studies on deep, low-mass ratio contact binaries (DLMRCBs) with mass ratios and fill-out factors of q < 0.25 and f > 50% (Yang & Qian 2015;Zhou et al 2016;Li et al , 2022, corresponding to the upper left region in Figure 7. Model calculations suggest that these DLMRCBs will finally merge into single stars, such as blue stragglers or FK-Com-type stars (Stepien 2006;Stępień 2011).…”

Section: Q-f Diagrammentioning

confidence: 99%

Physical Parameters of 11,100 Short-period ASAS-SN Eclipsing Contact Binaries

Li 李,

Zhu 朱,

Ding 丁

et al. 2024

ApJS

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Starting from more than 11,200 short-period (less than 0.5 days) EW-type eclipsing binary candidates with the All-Sky Automated Survey for Supernovae V-band light curves, we use the Markov Chain Monte Carlo algorithm and neural networks to obtain the mass ratio (q), orbital inclination (incl), fill-out factor (f), and temperature ratio (T s /T p ). After crossmatching with the Gaia DR3 database, the final sample contains parameters of 2399 A-type and 8712 W-type contact binaries (CBs). We present the distributions of parameters of these 11,111 short-period CBs. The mass ratio (q) and fill-out factor (f) are found to obey log-normal distributions, and the remaining parameters obey normal distributions. There is a significant period–temperature correlation of these CBs. Additionally, the temperature ratio (T s /T p ) tends to increase as the orbital period decreases for W-type CBs. There is no significant correlation between them for A-type CBs. The mass ratio and fill-out factor (q−f) diagram suggest there is no significant correlation between these two parameters. A clear correlation exists between the mass ratio and radius ratio. The radius ratio increases with the mass ratio. Moreover, the deep fill-out CBs tend to fall on the upper boundary of the q−R s /R p distribution, while the shallow fill-out CBs fall on the lower boundary.

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“…Searching for contact binary systems with low or extremely low-mass ratios is therefore an important research topic. For example, Li et al (2022) has proposed a catalog of ten candidates of low-mass ratio contact binaries. Christopoulou et al (2022) has analyzed 30 candidates from the Catalina Sky Survey.…”

Section: = -+mentioning

confidence: 99%

The First Photometric Analysis of Two Low-mass-ratio Contact Binary Systems in TESS Survey

Cheng,

Xiong,

Ding

et al. 2024

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Low-mass-ratio (q) contact binary systems are progenitors of stellar mergers such as blue stragglers or fast-rotating FK Com stars. In this study, we present the first light curve analysis of two newly identified low mass-ratio contact binary systems, TIC 55007847 and TIC 63597006, that are identified from TESS. Both stars are classified as A-subtype contact binaries. We obtained the precise orbit periods for the two objects by using the O − C method, i.e., P = 0.6117108 day for TIC 55007847 and P = 0.7008995 day for TIC 63597006, and found an obvious periodic signal in the O − C curve of TIC 63597006. We suggest that the periodic signal comes from a third body. We further use the Markov chain Monte Carlo method with PHOEBE to derive the photometric solutions for the two binaries. The photometric solution for this object shows that the contribution of the third body is about 6%. Our analysis revealed that TIC 55007847 has an extremely low mass ratio of q = 0.08. By calculating the ratio of spin angular momentum to the orbital angular momentum J s/J o, we found that TIC 55007847 is very close to the instability threshold with J s/J o = 0.31, indicating that it may merge into a single, fast-rotating star in the future. For TIC 63597006, q = 0.14 and J s/J o = 0.15. This object is in a relatively stable evolutionary status at present.

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Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems

Cited by 33 publications

References 66 publications

NY Bootes: An Active Deep and Low-mass-ratio Contact Binary with a Cool Companion in a Hierarchical Triple System

NY Bootes: An Active Deep and Low-mass-ratio Contact Binary with a Cool Companion in a Hierarchical Triple System

Physical Parameters of 11,100 Short-period ASAS-SN Eclipsing Contact Binaries

The First Photometric Analysis of Two Low-mass-ratio Contact Binary Systems in TESS Survey

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