Sigma Aquarii

Source: Wikipedia, the free encyclopedia.
Sigma Aquarii
Location of σ Aquarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 30m 38.82286s[1]
Declination −10° 40′ 40.7031″[1]
Apparent magnitude (V) 4.81[2]
Characteristics
Spectral type A0 IVs[3]
U−B color index −0.14[2]
B−V color index −0.08[2]
Distance
175 ± 6 ly
(54 ± 2 pc)
Absolute magnitude (MV)0.29±0.23[5]
Details
Myr
HR 8573, SAO 165134[9]
Database references
SIMBADdata

Sigma Aquarii,

apparent visual magnitude of 4.81.[2] Based upon parallax measurements, the distance to this star is approximately 175 light-years (54 parsecs).[1] It is drifting further away with a radial velocity of +11 km/s.[12]

The

spectrum displays at least double the normal abundances of elements like magnesium, aluminum and silicon, while helium and scandium are under-abundant. Calcium, normally deficient in Am stars, has near-normal abundance.[13]

The

astrometric binary with an orbital period of 654 days.[15]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:1966CoLPL...4...99J
    .
  3. ^
    doi:10.1086/110819
    .
  4. S2CID 119231169
  5. ^
    doi:10.1051/aas:1999248
    .
  6. ^
    S2CID 55586789
    .
  7. ^
    S2CID 118549566
    .
  8. S2CID 18475298
    .
  9. ^ "* sig Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-04.
  10. ISBN 0-933346-84-0
  11. Bibcode:2010RMxAC..38..127T
  12. Bibcode:1953GCRV..C......0W
    .
  13. ^
    doi:10.1093/mnras/206.3.649
    .
  14. doi:10.1051/0004-6361/200810788
    .
  15. Bibcode:1997A&A...323L..49P. Note about binarity

External links
Retrieved from "https://en.wikipedia.org/w/index.php?title=Sigma_Aquarii&oldid=1122354859"