Alpha Octantis

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Template:Short description

Alpha Octantis
File:AlphaOctLightCurve.png
A light curve for Alpha Octantis plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) 5.13[3]
Characteristics
Spectral type F4III + F5III
(spectroscopic binary)[4]
U−B Template:Engvar +0.13[5]
B−V Template:Engvar Script error: No such module "val".[3]
Variable type EB[6]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[3] km/s
Proper motion (μ) RA: +22.5215[2] mas/yr
Dec.: −369.325[2] mas/yr
Parallax (π)22.5215±0.0955 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Script error: No such module "val".[7]
Orbit[4]
Period (P)9.073 d
Eccentricity (e)0.39
Periastron epoch (T)2,435,302.404
Argument of periastron (ω)
(secondary)		276°
Semi-amplitude (K1)
(primary)		47 km/s
Semi-amplitude (K2)
(secondary)		47 km/s
Details
Mass1.42[8] Template:Solar mass
Radius3.69[9] Template:Solar radius
Temperature6,270[7] K
Metallicity [Fe/H]0.07[7] dex
Rotational velocity (v sin i)85[10] km/s
AgeScript error: No such module "val".[7] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Alpha Octantis is a binary star[12] system in the constellation of Octans. The name is Latinized from α Octantis. Despite being labeled the "alpha" star by Lacaille, it is not the brightest star in the constellation—that title belongs to Nu Octantis. It is visible to the naked eye as a faint, yellow-white-hued point of light with an overall apparent visual magnitude of approximately 5.13.[3] The system is located approximately 148 light-years away from the Sun based on parallax.

This is a double-lined spectroscopic binary star which consists of two similar giant stars, each with spectral type F, orbiting each other with a period of just over 9 days and an eccentricity of 0.39.[4] The pair form a Beta Lyrae-type eclipsing binary system, dropping by magnitude 0.04 during the primary eclipse.[6] This system is a bright X-ray source with a luminosity of Script error: No such module "val"..[13] The system displays an infrared excess suggesting the presence of a debris disk; with a temperature of Script error: No such module "val". and is orbiting at a distance of Script error: No such module "val". from its host star.[14]

References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e Template:Cite DR2
  3. ↑ a b c d Script error: No such module "Citation/CS1".
  4. ↑ a b c The double-lined binary alpha Octantis, William Buscombe and Pamela M. Morris, The Observatory 80 (February 1960), pp. 28–29, Bibcode:1960Obs....80...28BScript error: No such module "check bibcode"..
  5. ↑ HR 8021, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 4, 2008.
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b c d Script error: No such module "Citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "Citation/CS1".
  11. ↑ Template:Cite simbad
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".

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External links

Template:Stars of Octans

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