Chi Ophiuchi

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Chi Ophiuchi

A blue-light light curve for Chi Ophiuchi, adapted from Cuypers et al. (1989)[1]
Observation data
ICRS
)
Constellation
Ophiuchus
Right ascension 16h 27m 01.43557s[2]
Declination −18° 27′ 22.4500″[2]
Apparent magnitude (V) 4.22[3] (4.18 to 5.0)[4]
Characteristics
Evolutionary stage main sequence
Spectral type B2Vne[5]
U−B color index −0.75[6]
B−V color index +0.28[6]
R−I color index +0.22[6]
Variable type GCAS[4] + LERI[7]
Distance
500 ± 10 ly
(153 ± 5 pc)
Absolute magnitude (MV)−2.27[9]
Details
Myr
PPM 231703[13]
Database references
SIMBADdata

Chi Ophiuchi,

light years,[2] but it is moving closer to the Sun with a radial velocity of −19 km/s.[8] This star is a proper motion member of the Upper Scorpius sub-group in the Scorpius–Centaurus OB association; the nearest such co-moving association of massive stars to the Sun.[14]

This is a massive

critical velocity for the star is 477 km/s, the inclination angle of its poles must be small; estimated as ~20°.[15] It is a Gamma Cassiopeiae variable with an amplitude of 0.15 magnitude.[16] The brightness has been measured varying from magnitude 4.18 down to 5.0.[4]

Chi Ophiuchi is 22.5 million years old with 10.1 times the

luminosity of the Sun from its photosphere at an effective temperature of about 30,000 K. A weak magnetic field has been detected in the chromosphere of this star.[17] It is being orbited by a symmetrical disk of ejected gas extending out to 0.52 AU (112 R☉),[15] and excess radio and infrared emission has been detected from this structure.[18]

Abt and Levy (1978) cataloged Chi Ophiuchi as a single-lined

orbital elements are considered marginal.[19] Eggleton and Tokovinin (2008) list it as a single star.[20]

References

  1. Bibcode:1989A&AS...81..151C
    .
  2. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  3. ^
    S2CID 119257644
    .
  4. ^
    S2CID 125853869
    . Note: catalogued as 'ksi Oph'.
  5. ^
    Bibcode:1988mcts.book.....H
    .
  6. ^
    CDS
    . Retrieved 2019-10-24.     HR 6118, database entry.
  7. Bibcode:2006SASS...25...47W
    .
  8. ^
    S2CID 119231169
    .
  9. S2CID 220128144
    .
  10. ^
    S2CID 118629873
    .
  11. ^
    S2CID 74872624
    .
  12. hdl:11336/37946
    .
  13. ^ a b "chi Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved January 12, 2011.
  14. Bibcode:1989A&A...216...44D
    .
  15. ^
    S2CID 16779318
    .
  16. Bibcode:2000IBVS.5008....1A
    .
  17. S2CID 15213781
    .
  18. doi:10.1093/mnras/228.4.811
    .
  19. doi:10.1086/190498
    .
  20. S2CID 14878976
    .
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