The double degenerate LP400-22 revisited

Details The double degenerate LP400-22 revisited The double degenerate LP400-22 revisited

2009-09-17

arxiv.org/abs/0909.3261v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in A&A

Scientific paper

We re-examine the properties of the high-velocity and extremely low mass white dwarf LP 400-22 and its close companion. Based on an extended observation timeline we determined a binary period of P= 1.01016 d, somewhat longer than the previously published period, and a mass function f(M_2)= 0.180 M_solar implying a mass for the companion M_2 > 0.41 M_solar. We also re-appraised the mass and cooling age of the white dwarf using low-metallicity (Z=0.001) evolutionary models appropriate for an old halo member, M_1 = 0.19 M_solar and t_cool~1.8 Gyr, and we infer a mass of 0.85 - 1.0 M_solar for the progenitor of the white dwarf. We discuss the likely origin of this system.

Affiliated with

Also associated with

No associations

Rating

The double degenerate LP400-22 revisited does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The double degenerate LP400-22 revisited, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The double degenerate LP400-22 revisited will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-391411