SIMBAD references

We present orbit-sampled photometry of the binary system WD 2154+408. The photometric study reveals a period of P=0.26772 day, which is taken to be the orbital period of the binary. No evidence is seen for either an accretion disk or mass transfer, leading to the conclusion that WD 2154+408 is not a contact or semidetached system but has detached components with a visible irradiation effect. The short orbital period also leads to the conclusion that the system passed through a common-envelope phase at some time in the past. A single spectrum is shown exhibiting both narrow emission and broad absorption components of the Hβ line. This and the photometric variations are consistent with the system being a post-common-envelope binary consisting of a hot white dwarf primary and a cool irradiated companion.