Properties of the unusual CV V455 Andromedae (= HS2331+3905)

Name: V455 Andromedae, V455 And, HS2331+3905

Coordinates: R.A. 23 34 01.45, Dec +39 21 40.9 (2000.0)

Magnitude: V~16 (quiescent), V~8 (outburst)

Discovery: Hamburg Quasar Survey [1]

Eclipsing: Grazing (inclination estimated i~75 degrees) [2]

Orbital period: 81.09 minutes [2]

Orbital ephemeris: HJD 2451812.67765(35) + 0.05630921 x E [2]

Superhump period: 83.38 minutes

Superoutburst: 5 September 2007 (the only recorded outburst so far)

WD Pulsations: complex set of non-radial (ZZ Ceti -type) pulsation frequencies near ~5 min

WD Spin period: 62.67s = 1277.73 d^-1 [3]

WD temperature: ~10500 K [2]

Donor star: Spectral type L2 or later

References

[1] Araujo-Betancor et al 2004, RMxAC, 20, 190

[2] Araujo-Betancor et al 2005, A&A, 430, 629

[3]