Astronomy:Xi1 Ceti

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Short description: Star in the constellation Cetus


For other stars with this Bayer designation, see ξ Ceti.
Xi1 Ceti
Cetus IAU.svg
Red circle.svg
Location of ξ1 Ceti (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cetus
Right ascension  02h 12m 59.99769s[1]
Declination +08° 50′ 48.2023″[1]
Apparent magnitude (V) +4.36[2] [combined]
Characteristics
Spectral type G7III Ba0.4 Fe-1[3] + DA4[4]
B−V color index 0.878±0.024[2]
Astrometry
Radial velocity (Rv)−3.93±0.09[2] km/s
Proper motion (μ) RA: −24.498[1] mas/yr
Dec.: −5.952[1] mas/yr
Parallax (π)9.5451 ± 0.3275[1] mas
Distance340 ± 10 ly
(105 ± 4 pc)
Absolute magnitude (MV)–0.99[5]
Orbit[6]
Period (P)1,642.1±1.3
Semi-major axis (a)≥ 0.896 ± 0.020 astronomical unit|AU (134 ± 3 Gm)
Eccentricity (e)0 (fixed)
Periastron epoch (T)34,985±5 MJD
Semi-amplitude (K1)
(primary)		5.91±0.14 km/s
Details
A
Mass3.80[5] M☉
Radius18.2+1.0
−2.4[1] R☉
Luminosity209.9±8.2[1] L☉
Surface gravity (log g)2.60[1] cgs
Temperature5,184±50[5] K
Metallicity [Fe/H]−0.01[5] dex
Age100[7] Myr
B
Mass0.8[5] M☉
Surface gravity (log g)8.4[8] cgs
Other designations
ξ1 Cet, ksi01 Cet, 65 Ceti, NSV 749, BD+08° 345, HD 13611, HIP 10324, HR 649, SAO 110408, WDS 02130+0851, WD 02130+0851[9]
Database references
SIMBADdata
Exoplanet Archivedata

Xi1 Ceti , Latinized from ξ1 Ceti, is a binary star[10] system located in the equatorial constellation of Cetus. It is visible to the naked eye with a combined apparent visual magnitude of +4.36.[2] The distance to this system is approximately 340 light years based on parallax measurements, and it is drifting closer to the Sun with a radial velocity of −4 km/s.[2] The proximity of the star to the ecliptic means it is subject to lunar occultations.[11]

The spectroscopic binary nature of Xi1 Ceti was discovered in 1901 by William Wallace Campbell using the Mills spectrograph at the Lick Observatory.[12][6] The pair have a circular orbit with a period of 4.5 years and a separation of 3.8 astronomical unit|AU.[5] It is a suspected eclipsing binary with an amplitude of 0.03 in magnitude, which would suggest the orbital plane has a high inclination.[13]

The primary, designated component A, is a mild barium[14] giant star with a stellar classification of G7III Ba0.4 Fe-1.[3] Morgan and Keenan in 1973 had classified it as a bright giant star with an anomalous underabundance of the CN molecule.[15] Evidence has been found for an overabundance of s-process elements,[5] although this is disputed.[7] The star has 3.8[5] times the mass and 18[1] times the radius of the Sun. The companion, component B, is a small white dwarf companion with 80% of the mass of the Sun and a class of DA4.[4] It was detected in 1985 by its ultraviolet emission.[8]

In Chinese, 天囷 (Tiān Qūn), meaning Circular Celestial Granary, refers to an asterism consisting of α Ceti, κ1 Ceti, λ Ceti, μ Ceti, ξ1 Ceti, ξ2 Ceti, ν Ceti, γ Ceti, δ Ceti, 75 Ceti, 70 Ceti, 63 Ceti and 66 Ceti. Consequently, the Chinese name for Xi1 Ceti itself is "the Fifth Star of Circular Celestial Granary", Tiān Qūn Wu.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K. 
  4. ↑ 4.0 4.1 McCook, G. P.; Sion, E. M. (1999), "A Catalogue of Spectroscopically Identified White Dwarfs", The Astrophysical Journal Supplement Series 121 (1): 1–130, doi:10.1086/313186, Bibcode: 1999ApJS..121....1M. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 Kong, X. M. et al. (May 2018), "Chemical abundances of primary stars in the Sirius-like binary systems", Monthly Notices of the Royal Astronomical Society 476 (1): 724–740, doi:10.1093/mnras/sty280, Bibcode: 2018MNRAS.476..724K. 
  6. ↑ 6.0 6.1 Griffin, R. F.; Herbig, G. H. (1981). "Spectroscopic Orbits of Xi Piscium 60 Andromedae and ξ1 Ceti". Monthly Notices of the Royal Astronomical Society 196: 33–43. doi:10.1093/mnras/196.1.33. Bibcode: 1981MNRAS.196...33G. 
  7. ↑ 7.0 7.1 Smiljanic, R. et al. (June 2007), "Abundance analysis of barium and mild barium stars", Astronomy and Astrophysics 468 (2): 679–693, doi:10.1051/0004-6361:20065867, Bibcode: 2007A&A...468..679S. 
  8. ↑ 8.0 8.1 Böhm-Vitense, E.; Johnson, H. R. (June 1985), "Detection of a compact companion of the mild barium star ksi1 Ceti", Astrophysical Journal 293: 288–293, doi:10.1086/163236, Bibcode: 1985ApJ...293..288B. 
  9. ↑ "ksi01 Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ksi01+Cet. 
  10. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  11. ↑ Schmidtke, P. C.; Africano, J. L. (September 1984), "KPNO lunar occultation summary. I", Astronomical Journal 89: 1371–1378, doi:10.1086/113637, Bibcode: 1984AJ.....89.1371S. 
  12. ↑ Campbell, William Wallace (1901). "Some recent results secured with the Mills spectrograph". Lick Observatory Bulletin 1 (4): 22–25. doi:10.5479/ADS/bib/1901LicOB.1.22C. Bibcode: 1901LicOB...1...22C. 
  13. ↑ Hoffleit, Dorrit (1996), "A Catalogue of Correlations Between Eclipsing Binaries and Other Categories of Double Stars", The Journal of the American Association of Variable Star Observers 24 (2): 105–116, Bibcode: 1996JAVSO..24..105H. 
  14. ↑ Pinsonneault, M. H. et al. (March 1984), "Lithium in the barium stars", Publications of the Astronomical Society of the Pacific 96: 239–246, doi:10.1086/131327, Bibcode: 1984PASP...96..239P. 
  15. ↑ Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics 11: 29, doi:10.1146/annurev.aa.11.090173.000333, Bibcode: 1973ARA&A..11...29M. 
  16. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日

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