1RXH J082623.6–505741: A New Long-period Cataclysmic Variable with an Evolved Donor and a Low Mass-transfer Rate
1RXH J082623.6–505741: A New Long-period Cataclysmic Variable with an Evolved Donor and a Low Mass-transfer Rate
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DOI：
10.3847/1538-4357/ac7b25
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发表时间：
2022-06
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通讯作者：
K. Sokolovsky;J. Strader;S. Swihart;E. Aydi;A. Bahramian;L. Chomiuk;C. Heinke;A. Hughes;Kwan-Lok Li;R. L. de Oliveira;J. Miller-Jones;K. Mukai;D. Sand;L. Shishkovsky;E. Tremou;K. Voggel
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作者：
K. Sokolovsky;J. Strader;S. Swihart;E. Aydi;A. Bahramian;L. Chomiuk;C. Heinke;A. Hughes;Kwan-Lok Li;R. L. de Oliveira;J. Miller-Jones;K. Mukai;D. Sand;L. Shishkovsky;E. Tremou;K. Voggel
我们报告发现了1 RXH J082623.6−505741，一个轨道周期为10.4小时的致密双星。模拟广泛的光学光度学和光谱学揭示了一个0.4 M的MK型二次转移质量通过一个低状态的吸积盘到一个0.8 M的白色矮星。第二个是过亮的质量和主导的光学光谱在所有的时代，必须演变，以填补其罗氏叶在这个轨道周期。由新的XMM-牛顿观测和档案观测得到的X射线光度L X 1-2 × 1032 erg s−1，虽然比大多数CV都高，但仍然只需要一个适度的吸积速率到白色矮星M现在为3 × 10−11到3 × 10−10 M yr−1，低于预期的具有演化次级的激变变星。目前还没有观测到矮新星爆发，这与低质量转移率相一致。其他几个具有类似轨道周期的激变变星也显示出出乎意料的低质量转移率，尽管选择效应不利于发现具有这些特性的双星。这表明长周期、低传质速率的激变变量的丰度和演化状态值得额外关注。
We report the discovery of 1RXH J082623.6−505741, a 10.4 hr orbital period compact binary. Modeling extensive optical photometry and spectroscopy reveals a ∼0.4 M ⊙ K-type secondary transferring mass through a low-state accretion disk to a nonmagnetic ∼0.8 M ⊙ white dwarf. The secondary is overluminous for its mass and dominates the optical spectra at all epochs and must be evolved to fill its Roche Lobe at this orbital period. The X-ray luminosity L X ∼ 1–2 × 1032 erg s−1 derived from both new XMM-Newton and archival observations, although high compared to most CVs, still only requires a modest accretion rate onto the white dwarf of Ṁ ∼ 3 × 10−11 to 3 × 10−10 M ⊙ yr−1, lower than expected for a cataclysmic variable with an evolved secondary. No dwarf nova outbursts have yet been observed from the system, consistent with the low derived mass-transfer rate. Several other cataclysmic variables with similar orbital periods also show unexpectedly low mass-transfer rates, even though selection effects disfavor the discovery of binaries with these properties. This suggests the abundance and evolutionary state of long-period, low mass-transfer rate cataclysmic variables are worthy of additional attention.