2004A&A...426..631L


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.21CEST06:22:50

2004A&A...426..631L - Astronomy and Astrophysics, volume 426, 631-640 (2004/11-1)

The parallax, mass and age of the PSR J2145-0750 binary system.

LOEHMER O., KRAMER M., DRIEBE T., JESSNER A., MITRA D. and LYNE A.G.

Abstract (from CDS):

We present results of high-precision timing measurements of the binary millisecond pulsar PSR J2145-0750. Combining 10 yrs of radio timing data obtained with the Effelsberg 100-m radio telescope and the Lovell 76-m radio telescope we measure a significant timing parallax of 2.0(6)mas placing the system at 500 pc distance to the solar system. The detected secular change of the projected semi-major axis of the orbit {dot}(x=1.8(6))x10–14lt-s/s, where x=(apsini)/c, is caused by the proper motion of the system. With this measurement we can constrain the orbital inclination angle to i<61°, with a median likelihood value of 46° which is consistent with results from polarimetric studies of the pulsar magnetosphere. This constraint together with the non-detection of Shapiro delay rules out certain combinations of the companion mass, m2, and the inclination, i. For typical neutron star masses and using optical observations of the carbon/oxygen-core white dwarf we derive a mass range for the companion of 0.7M≤m2≤1.0M. We apply evolutionary white dwarf cooling models to revisit the cooling age of the companion. Our analysis reveals that the companion has an effective temperature of T_ eff_=5750±600K and a cooling age of τ_ cool_=3.6(2)Gyr, which is roughly a factor of three lower than the pulsar's characteristic age of 10.4Gyr. The cooling age implies an initial spin period of P0=13.0(5)ms, which is very close to the current period.

Abstract Copyright:

Journal keyword(s): astrometry - stars: neutron - stars: white dwarfs - stars: binaries: general - stars: pulsars: individual: PSR J2145-0750

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 PSR J0437-47 Psr 04 37 15.7976203608 -47 15 08.536908257           DC 712 0
2 PSR J0621+10 Psr 06 21 22.11108 +10 02 38.7410           ~ 88 1
3 PSR J0737-3039A Psr 07 37 51.248 -30 39 40.83           ~ 213 1
4 PSR J0737-3039B Psr 07 37 51.24927 -30 39 40.7195           ~ 176 1
5 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 242 1
6 PSR J1141-6545 Psr 11 41 07.0220 -65 45 19.089     25.08 24.38   ~ 142 1
7 PSR J1640+2224 Psr 16 40 16.74231 +22 24 08.9413           ~ 122 0
8 PSR J1713+0447 Psr 17 13 49.53053 +07 47 37.5264           ~ 344 1
9 PSR J1744-1134 Psr 17 44 29.4103 -11 34 54.727           ~ 193 1
10 PSR B1855+09 Psr 18 57 36.39161 +09 43 17.2322           DA 468 1
11 PSR J1909-3744 Psr 19 09 47.43788 -37 44 14.3240           ~ 184 2
12 PSR B2145-07.8 Psr 21 45 50.47 -07 50 18.3           ~ 209 0

    Equat.    Gal    SGal    Ecl

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2019.08.21-06:22:50

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