Chi Eridani

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χ Eridani
Observation data
ICRS
)
Constellation Eridanus
Right ascension 01h 55m 57.45606s[1]
Declination −51° 36′ 31.9736″[1]
Apparent magnitude (V) 3.70[2] / 10.7[3]
Characteristics
Spectral type G8IV[4] or G8IIIb CNIV[5]
U−B color index +0.46[2]
B−V color index +0.85[2]
Distance
56.8 ± 0.3 ly
(17.43 ± 0.10 pc)
Absolute magnitude (MV)2.39 / 9.4[3]
Details
Rotational velocity
(v sin i)		4.50 km/s
HR 566, SAO 232573[9]
Database references
SIMBADdata
ARICNSA
B

χ Eridani (Latinised as Chi Eridani) is a

AU.[3]

The primary component is an

G-type subgiant star with a stellar classification of G8 IV.[4] It is about 1.6 times the mass of the Sun and has 4 times the Sun's radius.[8] The star shines with 10 times the solar luminosity from its outer atmosphere at an effective temperature of 5,115 K.[7] Unusually for a star of this class, it shows a photometric variability of 0.04 in magnitude, which may be due to a previous mass transfer from the secondary companion, or else from an undiscovered third companion.[8]

The companion is about 7 magnitudes fainter than the primary and may be the source of the X -ray emission from this system. This emission has a luminosity of 504.4×1027 erg s−1.[8]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    Bibcode:1986EgUBV........0M
    .
  3. ^
    Bibcode:1994RMxAA..28...43P
    . See pp. 58–59.
  4. ^
    S2CID 16080025
    .
  5. Bibcode:1978mcts.book.....H
    .
  6. S2CID 119231169
    .
  7. ^
    doi:10.1093/mnras/staa282
    .
  8. ^
    doi:10.1088/0067-0049/203/2/30
    , 30.
  9. ^ "* chi Eri -- Pre-main sequence Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-27.{{cite web}}: CS1 maint: postscript (link)
  10. S2CID 14878976
    .
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