Sigma Sculptoris

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Template:Short description

Sigma Sculptoris
File:SigSclLightCurve.png
An ultraviolet light curve for Sigma Sculptoris, adapted from Manfroid and Renson (1994)[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sculptor
Right ascension Template:RA[2]
Declination Template:DEC[2]
Apparent magnitude (V) +5.54[3]
Characteristics
Spectral type A1/2 IV[4]
U−B Template:Engvar +0.13[3]
B−V Template:Engvar +0.06[3]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[5] km/s
Proper motion (μ) RA: +80.50[2] mas/yr
Dec.: +14.64[2] mas/yr
Parallax (π)14.04±0.32 mas[2]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.24[6]
Orbit[7]
Period (P)46.9 days
Semi-major axis (a)0.35 au
Eccentricity (e)0.195
Inclination (i)27° or 135°
Semi-amplitude (K1)
(primary)		10.3 km/s
Details[7]
A
Mass1.95 Template:Solar mass
Radius2.0 Template:Solar radius
Luminosity25.7[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[9] cgs
Temperature8,470 K
Rotational velocity (v sin i)Script error: No such module "val".[10] km/s
Age560 Myr
B
Mass0.72 Template:Solar mass
Radius0.67 Template:Solar radius
Temperature4,530 K
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[11]
Database references
SIMBADdata

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Sigma Sculptoris, Latinized from σ Sculptoris, is a binary star in the southern constellation of Sculptor. It is faintly visible to the naked eye with an apparent visual magnitude of +5.54.[3] Based upon an annual parallax shift of 14.04 mas as seen from Earth,[2] it is located about 232 light years from the Sun.

The main component is a A-type star with a stellar classification of A1/A2 IV,[4] although many modern papers use a spectral class of A2V and describe Sigma Sculptoris as a somewhat evolved main sequence star.[7] It was suspected to be an Ap[12] or Am star,[13] and an Alpha2 Canum Venaticorum variable,[14] but no chemical peculiarity or variability was found in 2018.[13] The star has an estimated 1.95 the mass of the Sun and around two times the Sun's radius.[7] It is spinning with a projected rotational velocity of 82 km/s[10] and is about 560 million years old.[7] Sigma Sculptoris radiates 25.7[8] times the solar luminosity from its photosphere at an effective temperature of 8,470 K.[7]

The secondary is a relatively small star with 72% the mass of the Sun, 5.7 magnitudes fainter than the primary.[7]

References

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  7. ↑ a b c d e f g Script error: No such module "Citation/CS1".
  8. ↑ a b Script error: No such module "Citation/CS1".
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "Citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ a b Script error: No such module "Citation/CS1".
  14. ↑ Script error: No such module "Citation/CS1".

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Template:Stars of Sculptor

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