Zeta Trianguli Australis

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search

Template:Short description

Zeta Trianguli Australis
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.91[2]
Characteristics
Spectral type F9V + M4V[2][3]
U−B Template:Engvar +0.02[4]
B−V Template:Engvar +0.55[5]
Astrometry
Radial velocity (Rv)+8.3[6] km/s
Proper motion (μ) RA: 200.742 mas/yr[7]
Dec.: 109.341 mas/yr[7]
Parallax (π)82.8699±0.1627 mas[7]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.49[8]
Orbit[9]
Period (P)12.97662±0.00017 d
Eccentricity (e)0.01442±0.00021
Inclination (i)Script error: No such module "val".[10]°
Periastron epoch (T)JD 2452752.31955
Argument of periastron (ω)
(secondary)		252.98°±0.80°
Semi-amplitude (K1)
(primary)		7.4988±0.0016 km/s
Details
ζ TrA A
Mass1.12[11] Template:Solar mass
RadiusScript error: No such module "val".[12] Template:Solar radius
LuminosityScript error: No such module "val".[12] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[12] cgs
TemperatureScript error: No such module "val".[12] K
Metallicity [Fe/H]Script error: No such module "val".[13] dex
Rotation13 days[5]
Rotational velocity (v sin i)3.23[14] km/s
Age600–900[15] Myr
ζ TrA B
Mass0.30[10] Template:Solar mass
Temperature3,327[10] K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[16]
Database references
SIMBADdata
ARICNSdata

Script error: No such module "Check for unknown parameters".

Zeta Trianguli Australis is a spectroscopic binary star system in the southern constellation Triangulum Australe. The pair have a combined apparent visual magnitude of 4.90,[4] which is bright enough to be visible to the naked eye. Based on parallax measurements, the system is located at a distance of approximately 39.4 light years from Earth.[7] After closing to within Template:Cvt some 436,600 years ago,[17] it is now drifting farther away with a radial velocity of +8.3 km/s.[6]

The pair orbit each other once every 13 days, and the orbital eccentricity is a low 0.014, making their orbit nearly circular.[9] The primary component has a stellar classification of F9V, matching an F-type main-sequence star. It has a mass equal to 1.12 times the mass of the Sun,[11] a radius 1.06 times the radius of the Sun, and irradiated at an effective temperature of Script error: No such module "val"., slightly hotter than the Sun as well.[13] The companion is a small red dwarf star with a class in the range of M1–7V[2] and 40% of the Sun's mass.[11] The age of the system is estimated at 600–900 million years.[15]

Any objects orbiting the pair in a circumbinary orbit should have an orbital separation of 0.217 AU or higher; otherwise its orbit would be unstable due to gravitational interactions.[12]

Somewhat surprisingly for a star located at a declination of 70° S, it is a candidate swarm member of the Ursa Major moving group.[18] However, there is some evidence to the contrary.[5]

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ a b Script error: No such module "citation/CS1". Note: see VizieR catalogue I/311.
  2. ↑ a b c Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ a b Script error: No such module "citation/CS1".
  5. ↑ a b c Script error: No such module "citation/CS1".
  6. ↑ a b Script error: No such module "citation/CS1".
  7. ↑ a b c Template:Cite Gaia DR3
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b c Script error: No such module "Citation/CS1".
  11. ↑ a b c Script error: No such module "citation/CS1".
  12. ↑ a b c d e Script error: No such module "citation/CS1". Zeta TrA's database entry at VizieR.
  13. ↑ a b Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ a b Script error: No such module "citation/CS1".
  16. ↑ Template:Cite simbad
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".

Script error: No such module "Check for unknown parameters".

Template:Stars of Triangulum Australe

Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Zeta_Trianguli_Australis&oldid=2075091"