Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-10-29
Astronomy and Astrophysics
Astrophysics
5 pages (including figures). Using mn.sty and psfig.tex (included). Accepted for publication in MNRAS
Scientific paper
10.1046/j.1365-8711.1998.01396.x
We report on two RossiXTE observations of the anomalous X-ray pulsars 1E 1048.1-5937 and 1E 2259+586. Both sources have continued their almost constant spin-down during 1995/96. We carried out a search for orbital Doppler shifts, in their observed spin frequencies, deriving stringent limits on the projected semi-axis. Unless these systems have unlikely small inclinations, main sequence companions can be excluded. If 1E 1048.1-5937 and 1E 2259+586 are indeed binary systems, their companion stars must be either white dwarfs, or helium-burning stars with M < 0.8 Msolar, possibly underfilling their Roche lobe.
Israel Gian Luca
Mereghetti Sandro
Stella Luigi
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