| 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] |
| Distance | 37.66 ± 0.02 ly (11.546 ± 0.005 pc) |
| Orbit[3] | |
| Primary | CC Eridani A |
| Companion | CC 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 | |
| Mass | 0.57 M☉ |
| Radius | 0.645 R☉ |
| Age | 30[6] Myr |
| CC Eridani B | |
| Mass | 0.306 M☉ |
| Radius | 0.41 R☉ |
| Other designations | |
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
editCC 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
editVariability
editTwo 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
edit- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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
- ^ 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.
- ^ 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.
- ^ "CC Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-05-12.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
