PSR J1748-2446ad is a radio pulsar with a rotation frequency of 716 Hz , corresponding to a period of 0.00139595482 (6) seconds. It is the second fastest rotational pulsar. The current record holder is XTE J1739−285 (1122 rpm), but it is not confirmed, PSR J0952-0607 makes 707 rpm [2] . The pulsar was discovered by J. Hessels of McGill University using the Green Bank radio telescope . The mass of PSR J1748-2446ad is approximately two solar , which is not very different from other neutron stars . Radius - less than 16 km . Accordingly, the speed of rotation of the star at the equator is almost a quarter of the speed of light, more than 70,000 km / s .
| PSR J1748-2446ad | |
|---|---|
| Star | |
| Research history | |
| opening date | |
| Observational data ( Age J2000 ) | |
| Right ascension | 17 h 48 m |
| Declination | −24 ° 48 ′ |
| Distance | 18,000 St. years |
| Constellation | Sagittarius |
| Characteristics | |
| Spectral class | radio pulsar |
| physical characteristics | |
| Weight | 2 M ☉ |
| Radius | less than 16 km |
| Age | 2.5 ⋅10 7 years |
| Luminosity | 3367 L ☉ |
| Rotation | 716 rpm |
| The properties | Millisecond pulsar |
| Database Information | |
| SIMBAD | data |
| Sources: [1] | |
The pulsar belongs to the globular cluster Terzan 5 , located about 18,000 light-years from Earth in the constellation Sagittarius . The pulsar is part of a binary star system. The second component is a star with a minimum mass of 0.14 solar and a radius exceeding the sun by 5-6 times . Presumably, the star belongs to the main sequence and has not yet completely filled its Roche lobe .
The distance between the star and the pulsar ( 4-5 of the radius of the Sun) is comparable with the size of the star, 40% of the time the star eclipses the pulsar.
The orbit of the pulsar is circular, the system makes a complete revolution in 26 hours.
Images
Gal. Longitude 245.2357 °
Gal. −4.5049 °
Distance 18,000 St. years
Notes
- ↑ Ortolani, S. Distances of the bulge globular clusters Terzan 5, Liller 1, UKS 1, and Terzan 4 based on HST NICMOS photometry ( Astronomy and Astrophysics : journal. - EDP Sciences 2007. - Vol. 470 . - P. 1043 . - DOI : 10.1051 / 0004-6361: 20066628 . arXiv : 0705.4030
- ↑ Almost the fastest spinning top of the Universe: a pulsar with a record rotation speed was discovered , September 7, 2017
Links
- Hessels, JW; Ransom, SM; Stairs, IH; Freire, PC; Kaspi, VM ; Camilo, F. A radio pulsar spinning at 716 Hz (Eng.) // Science. - 2006 .-- March ( vol. 311 , no. 5769 ). - P. 1901 . - DOI : 10.1126 / science.1123430 . - PMID 16410486 .
- XTE J1739-285, Integral points to the fastest spinning neutron star, http://www.spaceref.com/news/viewpr.html?pid=21909