Sigma Arae

Source: Wikipedia, the free encyclopedia.
Not to be confused with S Arae.
Sigma Arae
Diagram showing star positions and boundaries of the Ara constellation and its surroundings
The location of σ Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 35m 39.58957s[1]
Declination –46° 30′ 20.4618″[1]
Apparent magnitude (V) +4.575[2]
Characteristics
Spectral type A0 V[3]
U−B color index –0.064[2]
B−V color index –0.027[2]
Distance
380 ± 10 ly
(116 ± 3 pc)
Absolute magnitude (MV)1.40[4]
Details
Luminosity (bolometric)26.4[4] L☉
Temperature9,790[4] K
SAO 228162.[5]
Database references
SIMBADdata

Sigma Arae (σ Ara, σ Arae) is the

mas,[1] is around 380 light-years (120 parsecs
).

This is an

A-type star, X-ray emissions with a luminosity of 4.6 × 1029 erg s−1 have been detected from Sigma Arae. Normally this is explained by the presence of a lower mass orbiting companion star. However, such a scenario does not appear to hold true for this star. Instead, the signature of a surface magnetic field has been detected with a strength of roughly 128 ± 73 Gauss, indicating the source of the X-rays may be surface magnetic activity.[6]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    Bibcode:1973MmRAS..77..223C
    .
  3. ^
    Bibcode:1978mcts.book.....H
    .
  4. ^
    S2CID 8607533
  5. ^ "* sig Ara". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-02.{{cite web}}: CS1 maint: postscript (link)
  6. doi:10.1051/0004-6361:20078963

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Sigma_Arae&oldid=1165517693"