HK Aquarii

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HK Aquarii

A visual band light curve for HK Aquarii, adapted from Young et al. (1990)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 08m 19.55110s[2]
Declination 15° 24′ 35.7682″[2]
Apparent magnitude (V) 10.99±0.02[3]
10.72 - 10.94[4]
Characteristics
Evolutionary stage Main sequence
Spectral type M0Ve[5]
U−B color index +1.118[6]
B−V color index +1.31[3]
Variable type
UV Cet[4]
Distance
81.25 ± 0.09 ly
(24.91 ± 0.03 pc)
Absolute magnitude (MV)+9.13[6]
Details
Myr
HIP
 114252
Database references
SIMBADdata

HK Aquarii is a single

light years from the Sun based on parallax.[2] The radial velocity is poorly constrained but it appears to be drifting further away at a rate of ~2 km/s.[7]

This is a small

luminosity of the Sun from its photosphere at an effective temperature of 3,800 K.[3]

HK Aquarii is classified as a

flares.[11] Star spots have been reported at a variety of latitudes, but not at the poles.[12] Flaring activity was reported in 1987, and a steady X-ray emission has been detected.[9] These are characteristic of very young stars; although it is not close to any youthful open cluster, it is a possible ejected member of the Pleiades.[11] (A 2016 study instead suggests it is a member of the Octans association.[10]
)

The signature of prominences has been detected in the star's atmosphere. These display evidence of periodic oscillations and can reach altitudes greater than two-third's of the star's radius. The prominences can obtain a higher mass and volume compared to similar features on the Sun.[13]

References

  1. doi:10.1086/168347
    . Retrieved 17 October 2021.
  2. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  3. ^
    doi:10.1093/mnras/stu1313
    .
  4. ^
    S2CID 125853869
    .
  5. ^
    S2CID 16080025
    .
  6. ^
    doi:10.1111/j.1365-2966.2009.16182.x
    .
  7. ^
    S2CID 119231169
  8. ^
    doi:10.1007/s00159-009-0020-6
    .
  9. ^
    doi:10.1046/j.1365-8711.2001.04649.x.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  10. ^
    S2CID 53138126
    . A13.
  11. ^ a b Crosswell, Ken (1992). A Star that Breaks all the Rules. Kalmbach Books. pp. 54–59. {{cite book}}: |work= ignored (help)
  12. doi:10.1111/j.1365-2966.2004.07949.x
    .
  13. doi:10.1093/mnras/stw1922
    .
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