13 Ceti

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13 Ceti

A light curve for BU Ceti, plotted from TESS data
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cetus
Right ascension 00h 35m 14.87968s[1]
Declination −03° 35′ 34.2367″[1]
Apparent magnitude (V) 5.20[2] (5.61 + 6.90)[3]
Characteristics
Evolutionary stage Main sequence
Spectral type F6 V + G4 V + K3.5 V[4][5]
B−V color index 0.567±0.008[2]
Variable type RS CVn[6]
Distance
69.3 ± 1.0 ly
(21.3 ± 0.3 pc)
Absolute magnitude (MV)3.56[2]
Argument of periastron
(ω)
(secondary)		283.8°°
Semi-amplitude
(K1)
(primary)		43.98±0.39 km/s
Details
Aa
Gyr
HR 142, SAO 128839, WDS 00352-0336[10]
Database references
SIMBADdata

13 Ceti is a

light years from the Sun based on stellar parallax, and is drifting further away with a radial velocity of +10.4 km/s.[7] It shares a common motion with the Hyades moving group,[5] although it is too old to be a member.[11]

This star was identified as a visual binary system by

variable star designation of BU Cet.[6] The star was detected as a source of soft X-ray emission by EXOSAT.[13] It has 18%[5] more mass than the Sun and is estimated to be about four[2]
 billion years old.

In 1907,

spectroscopic binary, making this a triple star system. This is a double-lined spectroscopic binary with a period of 2.1 days and a circularized orbit. The companion signature was confirmed using the separated fringe packet technique with the CHARA array.[14] It is most likely a K-type main-sequence star with a class of K3.5 V and 70% of the mass of the Sun.[5]

The secondary member of the visual binary, designated component B, is a

″ from the primary along a position angle of 322°.[3]

References

  1. ^
    S2CID 18759600
    .
  2. ^
    S2CID 119257644
    .
  3. ^
    doi:10.1086/323920
    , retrieved 2015-07-22.
  4. ^
    Bibcode:1993A&AS..100..173S
    .
  5. ^
    doi:10.1051/0004-6361/201936199
    , A96.
  6. ^
    doi:10.1086/191866
    .
  7. ^
    S2CID 15290475
    .
  8. ^
    doi:10.1093/mnras/stz3616
    .
  9. Bibcode:1991A&A...248..485D
    .
  10. ^ "13 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-05.
  11. Bibcode:2001ASPC..223.1477M
    .
  12. doi:10.1086/144671
    .
  13. S2CID 121806441
    .
  14. S2CID 15622813
    , 24.
  15. doi:10.1086/143133
    .
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