HD 65907
Star in the constellation Carina
From Wikipedia, the free encyclopedia
HD 65907 is a star in the constellation Carina. At an apparent magnitude of +5.59, it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give a distance of 52.7 light-years (16.17 parsecs).
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Carina[1] |
| Right ascension | 07h 57m 46.9143s[2] |
| Declination | −60° 18′ 11.059″[2] |
| Apparent magnitude (V) | 5.59[1] |
| Characteristics | |
| Evolutionary stage | Blue straggler[3] |
| Spectral type | F9.5V[1] |
| B−V color index | 0.573±0.009[1] |
| Astrometry | |
| Radial velocity (Rv) | +14.9570±0.0003[4] km/s |
| Proper motion (μ) | RA: +517.625 mas/yr[2] Dec.: +119.206 mas/yr[2] |
| Parallax (π) | 61.8360±0.0417 mas[2] |
| Distance | 52.75 ± 0.04 ly (16.17 ± 0.01 pc) |
| Absolute magnitude (MV) | +4.54[1] |
| Details | |
| Mass | 1.02+0.02 −0.01[5] M☉ |
| Radius | 1.07±0.01[6] R☉ |
| Luminosity | 1.30+0.04 −0.05[6] L☉ |
| Surface gravity (log g) | 4.52±0.02[5] cgs |
| Temperature | 5,992±9[5] K |
| Metallicity [Fe/H] | −0.315±0.005[5] dex |
| Rotational velocity (v sin i) | 1.04[3] km/s |
| Age | 11[3] Gyr |
| Other designations | |
| CD−59°1773, HD 65907, HIP 38908, HR 3138, TYC 8911-793-1[7] | |
| Database references | |
| SIMBAD | A |
| B | |
| C | |
Characteristics
The spectrum of this star matches a spectral class of F9.5V,[1] with the luminosity class V suggesting that it is a main sequence star fusing atoms of hydrogen into helium at its core. Based on stellar isochrones, HD 65907 would be roughly 4.6 billion years old,[5] nearly the same as the Solar System, and it would be expected to be a population I star. However, the chemical properties and galactic orbit of this star strongly indicate that it is a population II star, which would place its actual age at 11 billion years. To account for its old age, the star must be a blue straggler, the product of a stellar merger. The merger happened five billion years ago and involved two stars with less than 0.5 solar masses.[3]
HD 65907 has 1.02 times the mass of the Sun[5] and 1.07 times the Sun's radius. It radiates 1.30 times the Sun's luminosity from its photosphere[6] at an effective temperature of 5,992 K.[5] This temperature give it the yellowish-white hue typical of a star near the F/G boundary.[8]
The star displays an infrared excess, indicating that it is surrounded by a debris disk. The disk has a radius of 96 astronomical units and a temperature of 30 K (−243.2 °C; −405.7 °F).[3]
HD 65907 is part of a triple star system also known as Gliese 294 or WDS J07578-6018.[9] The companions are named HD 65907 B and C, or Gliese 294 B and C, both red dwarfs with a combined spectral class of M0.5V,[10] and apparent magnitudes of +9.88 and +13.5, respectively.[11] The pair is separated at 60.6" from the F-type primary, with an estimated orbital period of 22,000 years, and the components B and C are separated by 2.468" from each other, with an estimated period of 270 years.[11]