Zeta Octantis

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ζ Octantis
Octans constellation map.svg
Red circle.svg
Location of ζ Octantis (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 08h 56m 40.97572s [1]
Declination −85° 39′ 47.3476″ [1]
Apparent magnitude  (V)5.42±0.01 [2]
Characteristics
Spectral type A8/9 IV [3] or F0 III [4]
U−B color index +0.07 [5]
B−V color index +0.31 [5]
Astrometry
Radial velocity (Rv)−3.6±2 [6]  km/s
Proper motion (μ)RA: −117.699  mas/yr [1]
Dec.: +33.964  mas/yr [1]
Parallax (π)20.9964 ± 0.0776  mas [1]
Distance 155.3 ± 0.6  ly
(47.6 ± 0.2  pc)
Absolute magnitude  (MV)+1.95 [7]
Details
Mass 2.06±0.40 [8]   M☉
Radius 2.25±0.11 [9]   R☉
Luminosity 12.63±0.09 [1]   L☉
Surface gravity (log g)4.04±0.28 [8]   cgs
Temperature 7,063±325 [10]   K
Metallicity [Fe/H]−0.36 [11]   dex
Rotational velocity (v sin i)115 [12]  km/s
Age 1.25 [13]   Gyr
Other designations
ζ Oct, 9 G. Octantis [14] , CPD−85°183, FK5  918, GC  12580, HD  79837, HIP  43908, HR  3678, SAO  258515 [15]
Database references
SIMBAD data

Zeta Octantis, Latinized from ζ Octantis, is a solitary, [16] yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.42, [2] making it faintly visible to the naked eye under ideal conditions. The star is located relatively close at a distance of only 156 light-years based on Gaia DR3 parallax measurements, [1] but is drifting closer with a radial velocity of −3.6  km/s . [6] At its current distance, Zeta Octantis' brightness is diminished by 0.25 magnitudes due to interstellar dust. [17]

This is an evolved A-type star with a stellar classification of A8/9 IV. [3] David S. Evans and colleagues, however, give it a classification of F0 III, [4] which suggests it is already an evolved giant star. It has double the Sun's mass, [8] and 2.25 times the Sun's radius. [9] It radiates around 13 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 7,063  K . [10] Zeta Octantis is estimated to be 1.25 billion years olds based on stellar evolution models by Trevor J. David and Lynne A. Hillenbrand. [13] It has a low metallicity, having only 44% the abundance of heavy metals compared to the Sun. [11] Despite its advanced age, the object spins rapidly with a projected rotational velocity of 115  km/s , [12] resulting in an oblate shape with an equatorial bulge 11% larger than the polar radius. [18]

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  18. ↑ van Belle, Gerard T. (14 March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv: 1204.2572 . Bibcode:2012A&ARv..20...51V. doi: 10.1007/s00159-012-0051-2 . eISSN   1432-0754. ISSN   0935-4956.
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