Astronomy:Chi Ceti

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Short description: Double star in the constellation Cetus
Chi Ceti
Location of χ Ceti (circled in red)
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]]      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Cetus
HD 11171
Right ascension  01h 49m 35.10277s[1]
Declination −10° 41′ 11.0719″[1]
Apparent magnitude (V) 4.66[2]
HD 11131
Right ascension  01h 49m 23.34886s[3]
Declination −10° 42′ 14.0839″[3]
Apparent magnitude (V) 6.75[2]
Characteristics
HD 11171
Evolutionary stage main sequence[4]
Spectral type F3 III[5] or F0 V[6]
U−B color index +0.04[2]
B−V color index +0.33[2]
HD 11131
Evolutionary stage main sequence[3]
Spectral type G3 V[6]
U−B color index +0.12[2]
B−V color index +0.61[2]
Variable type BY Dra[7]
Astrometry
HD 11171
Radial velocity (Rv)−1.8[5] km/s
Proper motion (μ) RA: −147.867[1] mas/yr
Dec.: −93.480[1] mas/yr
Parallax (π)42.5848 ± 0.1249[1] mas
Distance76.6 ± 0.2 ly
(23.48 ± 0.07 pc)
Absolute magnitude (MV)+2.83±0.01[8]
HD 11131
Radial velocity (Rv)−3.89±0.12[9] km/s
Proper motion (μ) RA: −159.846[3] mas/yr
Dec.: −70.666[3] mas/yr
Parallax (π)41.8 ± 0.2579[3] mas
Distance78.0 ± 0.5 ly
(23.9 ± 0.1 pc)
Absolute magnitude (MV)4.98[10]
Details
HD 11171
Mass1.26[11] M☉
Radius1.95[11] R☉
Luminosity5.6[11] L☉
Surface gravity (log g)3.96[11] cgs
Temperature6,342[11] K
Metallicity [Fe/H]−0.08[12] dex
Rotational velocity (v sin i)54.7[12] km/s
Age1.5[12] Gyr
HD 11131
Mass1.03[11] M☉
Radius1.00[11] R☉
Luminosity0.98[11] L☉
Surface gravity (log g)4.53[13] cgs
Temperature5,804[13] K
Metallicity [Fe/H]−0.09[13] dex
Rotation10 days[14]
Rotational velocity (v sin i)2.1[15] km/s
Age1.1[15] Gyr
Other designations
χ Cet, GJ 9061, ENG 8
χ Ceti A: 53 Cet, BD−11°352, FK5 1051, HD 11171, HIP 8497, HR 531, SAO 148036[16]
χ Ceti B: EZ Cet, HD 11131, BD−11°351, HIP 8486, SAO 148033[17]
Database references
SIMBADχ Ceti
χ Ceti A
χ Ceti B

Chi Ceti is a double star in the equatorial constellation of Cetus. The name is a Bayer designation that is Latinized from χ Ceti, and abbreviated Chi Cet or χ Cet. They appear to be common proper motion companions, sharing a similar motion through space.[18] The brighter component, HD 11171, is visible to the naked eye with an apparent visual magnitude of 4.66, while the fainter companion, HD 11131, is magnitude 6.75.[2] Both lie at roughly the same distance, with the brighter component lying at an estimated distance of 76.6 light years from the Sun based upon an annual parallax shift of 42.58 mas.

A light curve for EZ Ceti, plotted from TESS data[19]

The primary, component A, is an evolved K-type giant star with a stellar classification of F3 III.[5] However, Houk and Swift (1999) listed a classification of F0 V,[6] which would match an F-type main sequence star. It displays an infrared excess at a wavelength of 70 μm and thus is a candidate host of an orbiting debris disk.[20]

The common proper motion companion, component B, is a G-type main sequence star with a classification of G3 V.[6] It is a BY Draconis variable with a periodicity of 8.92 days and a variable star designation of EZ Cet.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), pp. 0, Bibcode: 1986EgUBV........0M. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ Hardegree-Ullman, Kevin K. et al. (2023), "Bioverse: A Comprehensive Assessment of the Capabilities of Extremely Large Telescopes to Probe Earth-like O2 Levels in Nearby Transiting Habitable-zone Exoplanets", The Astronomical Journal 165 (6): 267, doi:10.3847/1538-3881/acd1ec, Bibcode: 2023AJ....165..267H. 
  5. ↑ 5.0 5.1 5.2 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal 150 (3): 23, doi:10.1088/0004-6256/150/3/88, 88, Bibcode: 2015AJ....150...88L. 
  6. ↑ 6.0 6.1 6.2 6.3 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey 5: 0, Bibcode: 1999MSS...C05....0H. 
  7. ↑ 7.0 7.1 Kazarovets, E. V. et al. (2006), "The 78th Name-List of Variable Stars", Information Bulletin on Variable Stars 5721: 1, Bibcode: 2006IBVS.5721....1K. 
  8. ↑ Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H. 
  9. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D. 
  10. ↑ Porto de Mello, G. F. et al. (March 2014), "A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun; I. Atmospheric parameters and color similarity to the Sun", Astronomy and Astrophysics 563: A52, doi:10.1051/0004-6361/201322277, Bibcode: 2014A&A...563A..52P. 
  11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 11.7 Stassun, Keivan G. et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, Bibcode: 2019AJ....158..138S. 
  12. ↑ 12.0 12.1 12.2 Borisov, Sviatoslav B. et al. (2023), "New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis", The Astrophysical Journal Supplement Series 266 (1): 11, doi:10.3847/1538-4365/acc321, Bibcode: 2023ApJS..266...11B. 
  13. ↑ 13.0 13.1 13.2 Datson, Juliet et al. (February 2015), "Spectroscopic study of solar twins and analogues", Astronomy & Astrophysics 574: 12, doi:10.1051/0004-6361/201425000, A124, Bibcode: 2015A&A...574A.124D. 
  14. ↑ Isaacson, Howard; Fischer, Debra (2010), "Chromospheric Activity and Jitter Measurements for 2630 Stars on the California Planet Search", The Astrophysical Journal 725 (1): 875, doi:10.1088/0004-637X/725/1/875, Bibcode: 2010ApJ...725..875I. 
  15. ↑ 15.0 15.1 Llorente De Andrés, F. et al. (2021), "The evolution of lithium in FGK dwarf stars. The lithium-rotation connection and the Li desert", Astronomy and Astrophysics 654, doi:10.1051/0004-6361/202141339, Bibcode: 2021A&A...654A.137L. 
  16. ↑ "chi Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=chi+Cet. 
  17. ↑ "V* EZ Cet". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+EZ+Cet. 
  18. ↑ Soderblom, David R.; Mayor, Michel (January 1993), "Stellar kinematic groups. I - The Ursa Major group", Astronomical Journal 105 (1): 226–249, doi:10.1086/116422, Bibcode: 1993AJ....105..226S. 
  19. ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 8 December 2021. 
  20. ↑ Koerner, D. W. et al. (February 2010), "New Debris Disk Candidates Around 49 Nearby Stars", The Astrophysical Journal Letters 710 (1): L26–L29, doi:10.1088/2041-8205/710/1/L26, Bibcode: 2010ApJ...710L..26K, http://openknowledge.nau.edu/449/7/Koerner_DW_etal_2010_New_debris_disk_candidates_around_49_nearby_stars%281%29.pdf. 



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