IPs
V455 And
Full Catalog
Related Systems
|
Related SystemsAsynchronous Polars (APs)I have now adopted a underlying definition of APs as "polars in a temporary state of asynchronism," and systems plausibly classified as such (without waiting for the time-consuming effort to measure the spin period derivative). For the latter, I have adopted 5% asynchronism as the limit. Magnetic CVs with higher degrees of asynchronisms are considered "nearly synchronous IPs.". See my page on Asynchronous Polars and Nearly Synchronous IPs for further details.
Pre-IPsThere is no doubt V471 Tau is a binary consisting of a red dwarf and a white dwarf, and the latter is undoubtedly asynchronously rotating and magnetic. However, accretion appears to be sporadic, at an extremely low level, or both. I prefer to define IPs such that only systems in which accretion usually provides a measurable fraction of the luminosity are included. Recently, Wilson et al. (2021, MNRAS, 508, 561) announced that CC Cet is a pre-IP.
AR ScoAgain, there is no doubt this is a binary consisting of an M dwarf and an asynchronously rotating magnetic white dwarf. However, so far, there is no indication that accretion currently plays any role in this system, with all non-stellar radiation being attributed to a pulsar-like mechanism and is rotation-powered. While there is a strong similarity to IPs, particularly AE Aqr, it's probably best not to include this among IPs, unless a non-negligible fraction of its luminosity turns out to be accretion powered.
Z AndThe coherent 25 min period found in this system appears convincing (although we could always use confirmation). I do not include this system because it is an symbiotic star with an M giant mass donor.
Please send your comments, suggestions etc. to Koji.Mukai@nasa.gov and/or Koji.Mukai@umbc.edu |
- Responsible NASA Official : Ryan Smallcomb
- Web Curator: J.D. Myers
- A service of the Astrophysics Science Division (ASD) at NASA/GSFC