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Young binary star system in the constellation of Taurus From Wikipedia, the free encyclopedia
GK Tauri is a young binary system composed of T Tauri-type pre-main sequence stars in the constellation of Taurus about 466 light years away, belonging to the Taurus Molecular Cloud.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Taurus |
GV Tauri A | |
Right ascension | 04h 29m 23.71056s[2] |
Declination | +24° 32′ 58.6176″[2] |
GV Tauri B | |
Right ascension | 04h 29m 23.6868s[3] |
Declination | +24° 33′ 01.1160″[3] |
Characteristics | |
GV Tauri A | |
Evolutionary stage | pre-main-sequence star |
Spectral type | K3[4] |
Apparent magnitude (K) | 10.872[2] |
Apparent magnitude (g) | 16.282[5] |
Variable type | T Tau |
GV Tauri B | |
Spectral type | late G to early K[4] |
Apparent magnitude (K) | 10.171[3] |
Astrometry | |
GV Tauri A | |
Proper motion (μ) | RA: 8.0±0.4 mas/yr[5] Dec.: −26.7±0.3 mas/yr[5] |
Parallax (π) | 7.01 ± 0.34 mas[5] |
Distance | 470 ± 20 ly (143 ± 7 pc) |
GV Tauri B | |
Position (relative to GV Tauri A) | |
Component | GV Tauri B |
Angular distance | 1.2″ [6] |
Projected separation | 170 AU |
Details[4] | |
GV Tauri A | |
Mass | 1.8 M☉ |
Luminosity | 2.3 L☉ |
Surface gravity (log g) | 4.0 cgs |
Temperature | 4800±200 K |
Age | 0.5[6] Myr |
GV Tauri B | |
Luminosity | 114 L☉ |
Age | 0.5[6] Myr |
Other designations | |
2MASS J04292373+2433002, Haro 6-10, TIC 268217520, Elia 3-7, LEI 4, HBC 389 | |
GV Tauri A: Gaia EDR3 149367383323435648, GV Tau S, EPIC 247820507, Haro 6-10 VLA 1, LEI 4A | |
GV Tauri B: GV Tau N, Haro 6-10 VLA 2, LEI 4B | |
Database references | |
SIMBAD | data |
The stars GV Tauri A (GV Tauri S) and G Tauri B (GV Tauri N) form a wide binary system, with the projected separation between components being 170 AU. Both are strongly shrouded by circumstellar dust - GV Tauri A by 30 magnitudes and the GV Tauri B up to 59 magnitudes in the V band.[4] Both components are suspected to be binaries themselves,[7] as they produce strongly ionized jets and molecular outflows.[8]
Both members of the binary system are medium-mass objects still contracting towards the main sequence and accreting mass, although accretion rates remain highly uncertain as of 2009.[4]
Both stars are surrounded by protoplanetary disks, with the observable dust in each being about 5×10−5 M☉, and the gas about 0.005 M☉.[6] The disk of GV Tauri B is rich in carbon monoxide, hydrogen cyanide and, unusually, methane.[8]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
protoplanetary disk | 0–17[6] AU | 65±5[6]° | — |
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
protoplanetary disk | 20[8] AU | 30 or 80±10[6]° | — |
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