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October 2, 2025Open Access

MASTER OT J072007.30+451611.6: A Polar with Strong Optical Variability and Suppressed He II Emission

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Authors

ABA. V. BobakovIoffe InstituteSZS. V. ZharikovUniversidad Autónoma de Baja CaliforniaAKA V KarpovaIoffe Institute

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Implication

Observation reveals strong optical variability and unique He II emission characteristics in a polar, suggesting unusual accretion behaviors.

Key Points

  • The source exhibits an optical brightness variation of about 3 mag, confirming its polar nature.
  • A high and low state of brightness over nearly 19 years suggests varying accretion rates influencing light output.
  • Doppler tomography shows emission from the accretion stream interacting with the magnetosphere of a white dwarf.
  • The unusually low ratio of He II to H$β$ emission widths indicates potential anomalies in the system's accretion processes.

Cite This Study

Bobakov et al. (2025) studied this question.

synapsesocial.com/papers/68de5d9383cbc991d0a20197https://doi.org/10.48550/arxiv.2507.08907
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1MASTER OT J072007.30+451611.6: a polar with strong optical variability and suppressed He ii emission2025 · 1 citations
  2. 2Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar2024
  3. 3Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8−501810) as an intermediate polar2024 · 8 citations
  4. 4Einstein Probe discovery of the short-period intermediate polar EP J115415.8−5018102025 · 3 citations
  5. 5X-ray and optical analysis of the prototype polar AN UMa2025