Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 00h 08m 18.17031s |
Declination | 51° 23′ 16.59837″ |
Characteristics | |
Evolutionary stage | Helium-burning pre-white dwarf |
Astrometry | |
Proper motion (μ) |
RA: 30.043
mas/
yr Dec.: -0.727 mas/ yr |
Parallax (π) | 2.4089 ± 0.0355 mas |
Distance | 1300
ly (398.5818 pc) |
Details | |
Mass | 0.64 ± 0.3 [1] M☉ |
Radius | 0.059 [1] R☉ |
Luminosity | 5011.9 [1] [2] L☉ |
Surface gravity (log g) | 6.7 [1] [2] cgs |
Temperature | 120,000 K; 200,000 ± 20,000 [1] [2] K |
Database references | |
SIMBAD | data |
KPD 0005+5106 is a helium-rich white dwarf star located 1300 light-years from Earth. [3] As a "pre-white dwarf", the star is believed to still be in the helium-burning phase, just before nuclear fusion finally stops. It is the hottest known white dwarf, with a temperature of 200,000 K. [2]
The star KPD 0005+5106 has been observed to emit high-energy X-rays that regularly increase and descrease in luminosity every 4 hours and 42 minutes. This indicates that the star possibly has a companion orbiting it, either a low-mass star or a planet. The white dwarf pulls material from its companion into a disk around itself, before it slams into its north and south poles. The concentration of material at the poles causes the creation of two bright spots emitting high-energy X-rays. [3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cassiopeia |
Right ascension | 00h 08m 18.17031s |
Declination | 51° 23′ 16.59837″ |
Characteristics | |
Evolutionary stage | Helium-burning pre-white dwarf |
Astrometry | |
Proper motion (μ) |
RA: 30.043
mas/
yr Dec.: -0.727 mas/ yr |
Parallax (π) | 2.4089 ± 0.0355 mas |
Distance | 1300
ly (398.5818 pc) |
Details | |
Mass | 0.64 ± 0.3 [1] M☉ |
Radius | 0.059 [1] R☉ |
Luminosity | 5011.9 [1] [2] L☉ |
Surface gravity (log g) | 6.7 [1] [2] cgs |
Temperature | 120,000 K; 200,000 ± 20,000 [1] [2] K |
Database references | |
SIMBAD | data |
KPD 0005+5106 is a helium-rich white dwarf star located 1300 light-years from Earth. [3] As a "pre-white dwarf", the star is believed to still be in the helium-burning phase, just before nuclear fusion finally stops. It is the hottest known white dwarf, with a temperature of 200,000 K. [2]
The star KPD 0005+5106 has been observed to emit high-energy X-rays that regularly increase and descrease in luminosity every 4 hours and 42 minutes. This indicates that the star possibly has a companion orbiting it, either a low-mass star or a planet. The white dwarf pulls material from its companion into a disk around itself, before it slams into its north and south poles. The concentration of material at the poles causes the creation of two bright spots emitting high-energy X-rays. [3]