Evidence for Magnetic Field Decay in RX J0720.4-3125: Erratum
Abstract
In the Letter ``Evidence for Magnetic Field Decay in RX J0720.4-3125,'' by John C. L. Wang (ApJ, 486, L119 [1997]), the expression for -Ω˙brk on p. L121 should read -Ω˙brk=(İ/I)Ω~(Ṁ/M)Ω=5×10-23M1.4nHV-320faccΩ s-2, and so Ω˙brk is of the same order as the magnetic dipole contribution, Ω˙dip, in the final (accretion) phase. The correct expression for equation (4) should then readṖ|NOW~4×10-22M1.4nHV-320faccP8.39 s s-1. (4)Thus, the evolutionary tracks during the accretion phase shown in Figure 1 should be vertical (P=8.39 s=constant) to an excellent approximation (see revised Fig. 1 below), for both exponential and power-law field decay.
The conclusions regarding magnetic field decay as summarized in the abstract of the Letter remain unchanged, except for the last sentence in the abstract, which should be deleted.- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 1998
- DOI:
- 10.1086/311265
- Bibcode:
- 1998ApJ...497L..55W
- Keywords:
-
- ERRATA;
- ADDENDA