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CC Eridani
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 34m 22.5662s[1]
Declination −43° 47′ 46.869″[1]
Apparent magnitude (V) 8.83[2]
Characteristics
Spectral type K7.5Ve/M3.5Ve[3]
Apparent magnitude (J) 5.795±0.018[4]
Apparent magnitude (H) 5.126±0.027[4]
Apparent magnitude (K) 4.885±0.016[4]
Variable type BY Draconis variable
Astrometry
Radial velocity (Rv)41.94[5] km/s
Proper motion (μ) RA: 57.516(32) mas/yr[1]
Dec.: −293.474(36) mas/yr[1]
Parallax (π)86.6124 ± 0.0355 mas[1]
Distance37.66 ± 0.02 ly
(11.546 ± 0.005 pc)
Orbit[3]
PrimaryCC Eridani A
CompanionCC Eridani B
Period (P)1.5615 days
Eccentricity (e)0
Semi-amplitude (K1)
(primary)
37.185 km/s
Semi-amplitude (K2)
(secondary)
69.289 km/s
Details[3]
CC Eridani A
Mass0.57 M
Radius0.645 R
Age30[6] Myr
CC Eridani B
Mass0.306 M
Radius0.41 R
Other designations
HD 16157, HIP 11964, TYC 7558-585-1, 2MASS J02342256-4347467[7]

CC Eridani is a spectroscopic binary star with an orbital period of 1.56 days that is also a BY Draconis variable star.

Observational history

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CC Eridani was first noticed, other than catalog entries, when a parallax measurement determined at Cape Observatory in South Africa showed that it was a relatively nearby star.[8] Due to its status as a nearby star radial velocity measurements were obtained starting in 1951 by David Stanley Evans at Radcliffe Observatory, Pretoria, South Africa. These measurements revealed that it was a spectroscopic binary and photometric measurements were initiated in 1956 to determine if it was variable.[5] The first year of photometric observations indicated a possible eclipsing binary[9] however subsequent years observations did not fit the eclipsing binary model.[5]

Properties

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Variability

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Two x-ray superflares were detected by the Swift Observatory.[10]

Multiple flares were detected by the South Pole Telescope in the millimeter range.[11]

References

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  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Slee, O. B.; et al. (2004). "A Multiwavelength Study of CC Eridani". Publications of the Astronomical Society of Australia. 21 (1): 72–81. Bibcode:2004PASA...21...72S. doi:10.1071/AS03034.
  3. ^ a b c Amado, P. J.; et al. (2000). "Rotational modulation and flares on RS CVn and BY Dra stars. XX. Photometry and spectroscopy of CC Eri in late 1989". Astronomy and Astrophysics. 359: 159–167. Bibcode:2000A&A...359..159A.
  4. ^ a b c Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.Vizier catalog entry
  5. ^ a b c Evans, D. S. (1959). "The Dwarf Binary HD 16157: An Interim Report". Monthly Notices of the Royal Astronomical Society. 119 (5): 526–533. Bibcode:1959MNRAS.119..526E. doi:10.1093/mnras/119.5.526.
  6. ^ Nielsen, Eric L.; et al. (2019). "The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au". The Astronomical Journal. 158 (1) 13. arXiv:1904.05358. Bibcode:2019AJ....158...13N. doi:10.3847/1538-3881/ab16e9.
  7. ^ "CC Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-12.
  8. ^ Cape, Of Good Hope Royal Observatory (1950). "Stellar Parallaxes Determined Photographically at the Cape Observatory (Seventeenth List)". Monthly Notices of the Royal Astronomical Society. 110 (4): 405–413. Bibcode:1950MNRAS.110..405.. doi:10.1093/mnras/110.4.405.
  9. ^ Evans, D. S. (1957). "HD 16157 - The Nearest Eclipsing Binary?". Monthly Notes of the Astronomical Society of South Africa. 16: 30. Bibcode:1957MNSSA..16...30E.
  10. ^ Karmakar, Subhajeet; et al. (2017). "X-Ray Superflares on CC Eri". The Astrophysical Journal. 840 (2) 102. arXiv:1705.06930. Bibcode:2017ApJ...840..102K. doi:10.3847/1538-4357/aa6cb0.
  11. ^ Guns, S.; et al. (2021). "Detection of Galactic and Extragalactic Millimeter-wavelength Transient Sources with SPT-3G". The Astrophysical Journal. 916 (2) 98. arXiv:2103.06166. Bibcode:2021ApJ...916...98G. doi:10.3847/1538-4357/ac06a3.