THE ORBITAL PERIOD EVOLUTION OF THE SUPERSOFT X-RAY SOURCE CAL 87

Journal Article · Thu Dec 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/815/1/17· OSTI ID:22521816

Ablimit, Iminhaji ^[1]; Li, Xiang-Dong ^[2]

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1. Key Laboratory for Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
2. Department of Astronomy, Nanjing University, Nanjing 210046 (China)

CAL 87 is one of the best known supersoft X-ray sources (SSSs). However, the measured masses, orbital period, and orbital period evolution of CAL 87 cannot be addressed by the standard thermal-timescale mass-transfer model for SSSs. In this work we explore the orbital evolution of CAL 87 with both analytic and numerical methods. We demonstrate that the characteristics mentioned above can be naturally accounted for by the excited-wind-driven mass-transfer model.

• OSTI ID: 22521816
• Journal Information: Astrophysical Journal, Vol. 815, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMIC X-RAY SOURCES
MASS TRANSFER
STAR EVOLUTION
STELLAR WINDS
WHITE DWARF STARS
X RADIATION