Deep fading event in the cataclysmic variable TT Arietis

Details Deep fading event in the cataclysmic variable TT Arietis Deep fading event in the cataclysmic variable TT Arietis

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aan...408....1t&link_type=abstract

AAVSO Alert Notice 408

Physics

1

Cataclysmic Variable, Vy Scl Variable, Tt Ari, Superhumps, Aavso International Database

Scientific paper

The VY Sculptoris-class cataclysmic variable TT Ari has begun its first large decline since its deep minimum of 1982-1985. Observations of TT Ari are urgently requested. The 1982-1985 event reached a minimum of m(vis)=15.5, where it remained for approximately 3.5 years. Observers are asked to closely follow TT Ari through its current decline, and to continue monitoring TT Ari if and when it reaches a stable minimum. All observations including visual estimates, CCD photometry, and CCD time-series are needed; visual positive and fainter-than estimates are both important. The first hints of decline appeared in the AAVSO light curve in late September 2009, with a deep decline becoming clear by by 2009 Oct 03. The event of 1982-1985 is the only recorded major fading in TT Ari, so the depth and duration of the current event cannot be predicted; it may reach its historic minimum of 15.5 and remain there for some time. Prior to the long-duration event, TT Ari declined to approxi!
mately 14.5 beginning in 1979; it had nearly recovered from this event before going into the deep minimum in early 1982. TT Ari is also known to exhibit rapid variability including quasiperiodic oscillations and negative superhumps. Time series observations made throughout the decline and eventual minimum are urgently needed. Please report observations to the AAVSO International Database as TT ARI.

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