Xi Octantis

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ξ Octantis
Octans IAU.svg
Red circle.svg
Location of ξ Octantis (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 22h 50m 22.8139s [1]
Declination −80° 07 25.8418 [1]
Apparent magnitude  (V)5.32 - 5.36 [2]
Characteristics
Evolutionary stage main sequence [3]
Spectral type B6 V [4] (B5/7 V) [5]
U−B color index −0.48 [6] [7]
B−V color index −0.13 [6]
Variable type SPB [8]
Astrometry
Radial velocity (Rv)22.1±0.5 [9]  km/s
Proper motion (μ)RA: +20.003  mas/yr [1]
Dec.: −12.607  mas/yr [1]
Parallax (π)6.35 ± 0.0644  mas [1]
Distance 514 ± 5  ly
(157 ± 2  pc)
Absolute magnitude  (MV)−0.57 [10]
Details
Mass 4.02±0.05 [3]   M
Radius 3.0±0.5 [11]   R
Luminosity 360+24
22
[3]   L
Surface gravity (log g)4.09 [11]   cgs
Temperature 14,050 [12]   K
Metallicity [Fe/H]−0.1 [12]   dex
Rotational velocity (v sin i)30 [13]  km/s
Age 46+25
16
[14]   Myr
Other designations
ξ Oct, 77 G. Octantis, CD−80°828, CPD−80°1055, GC  31821, HD  215573, HIP  112781, HR  8663, SAO  258946 [15] [16]
Database references
SIMBAD data

Xi Octantis, Latinized from ξ Octantis, is a solitary [17] variable star in the southern circumpolar constellation Octans. It has an apparent magnitude of about 5.3, allowing it to be faintly seen with the naked eye; however, this varies slightly. Located 514 light years away, the object is receding with a heliocentric radial velocity of 22  km/s .

A light curve for Xi Octantis, plotted from TESS data XiOctLightCurve.png
A light curve for Xi Octantis, plotted from TESS data

Xi Octantis has a stellar classification of B6 V, [4] indicating that it is an ordinary B-type main-sequence star. Hintler et al. gives it a luminosity class IV (subgiant) [19] while Houk and Cowley gives a classification intermediate between a B5 and B7 dwarf. [5] Nevertheless, it has 4 times the mass of the Sun [3] and is 3 times larger. [11] It shines with a luminosity of 360  L [3] from its photosphere at an effective temperature of 14,050  K , [12] giving it a whitish blue glow. Xi Octantis is 46 million years old [14] – 64.8% through its short main sequence lifetime [12] – and spins modestly with a projected rotational velocity of 30  km/s . [13]

When the Hipparcos catalogue was released in 1997, Xi Octantis was found to vary in magnitude [20] — ranging from 5.32 to 5.36 based on data from the International Variable Star Index. [2] It has since been classified as a Slowly pulsating B-dwarf with a period of 1.78 days. [2]

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