Query : 2011A&A...530A.104C

2011A&A...530A.104C - Astronomy and Astrophysics, volume 530A, 104-104 (2011/6-1)

He star evolutionary channel to intermediate-mass binary pulsar PSR J1802-2124.

CHEN W.-C., LI X.-D. and XU R.-X.

Abstract (from CDS):

The intermediate-mass binary pulsars (IMBPs) are characterized by relatively long spin periods (10-200ms) and massive (>0.4M) white dwarf (WD) companions. Recently, precise mass measurements have been performed for the pulsar and the WD in the IMBP PSR J1802-2124. Some observed properties, such as the low mass of the pulsar, the high mass of the WD, the moderately long spin period, and the tight orbit, imply that this system has undergone a peculiar formation mechanism. In this work, we attempt to simulate the detailed evolutionary history of PSR J1802-2124. We propose that a binary system consisting of a neutron star (NS, of mass 1.3M) and an He star (of mass 1.0M), and with an initial orbital period of 0.5 d, may have been the progenitor of PSR J1802-2124. Once the He star overflows its Roche lobe, He-rich material is transferred onto the NS at a relatively high rate of ∼10–7-10–6 M/yr, which is significantly higher than the Eddington accretion rate. A large amount of the transferred material is ejected from the vicinity of the NS by radiation pressure and results in the birth of a mildly recycled pulsar. Our simulated results are consistent with the observed parameters of PSR J1802-2124. Therefore, we argue that the NS + He star evolutionary channel may be responsible for the formation of most IMBPs with orbital periods ≲3d.

Abstract Copyright:

Journal keyword(s): pulsars: general - stars: evolution - stars: mass-loss

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 PSR J0621+10 Psr 06 21 22.11108 +10 02 38.7410           ~ 106 1
2 PSR B0655+64 Psr 07 00 37.802 +64 18 11.20           ~ 243 1
3 PSR J1232-6501 Psr 12 32 17.840 -65 01 03.33           ~ 23 0
4 PSR J1435-60 Psr 14 35 20.2765 -61 00 57.956           ~ 46 1
5 PSR J1756-5322 Psr 17 57 15.161 -53 22 26.38           ~ 41 0
6 PSR J1802-2124 Psr 18 02 05.44 -21 24 02.9           ~ 70 1

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