تقرير
Tilted Disk Precession and Negative Superhumps in HS 2325+8205: A Multi-Window Analysis
| العنوان: | Tilted Disk Precession and Negative Superhumps in HS 2325+8205: A Multi-Window Analysis |
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| المؤلفون: | Sun, Qi-Bin, Qian, Sheng-Bang, Zhu, Li-Ying, Li, Qin-Mei, Li, Min-Yu, Li, Ping |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Solar and Stellar Astrophysics |
| الوصف: | Tilted disk precession exists in different objects. Negative superhumps (NSHs) in cataclysmic variable stars (CVs) are hypothesized to arise from the interaction between the reverse precession of a tilted disk and the streams from the secondary star. Utilizing TESS photometry, we present a comprehensive investigation into the tilted disk precession and NSHs in the dwarf nova (DN) HS 2325+8205, employing eclipse minima, eclipse depths, NSH frequencies, and NSH amplitudes and the correlation between them as the windows. We report the discovery of NSHs in HS 2325+8205 with a period of 0.185671(17) d. The NSH frequency was found to vary with a period of 3.943(9) d, similar to the tilted disk precession period validated in novae-like star (NL, SDSS J0812) and intermediate polar (IP, TV Col). The eclipsing minima of O-C were similarly found to vary cyclically in period 4.135(5) d, showing faster rise than fall. Furthermore, NSH amplitude varies parabolically, linearly increasing with periodic variations, potentially linked to changes in disk radius, mass transfer rate, and apparent area of the hot spot. Additionally, for the first time in DNe, we observe bi-periodic variations in eclipse depth (P1= 4.131(4) d and P2= 2.065(2) d ~ Pprec/2), resembling those seen in IPs, suggesting that variations with P2 are not attributable to the accretion curtain. Moreover, NSH amplitude and eclipse depth decrease with increasing NSH frequency, while NSH amplitude correlates positively with eclipse depth.These complex variations observed across multiple observational windows provide substantial evidence for understanding of tilted disk precession and NSHs. Comment: 26 pages, 10 figures and 2 tables |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2407.04913 |
| رقم الأكسشن: | edsarx.2407.04913 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |