Location of ι Chamaeleontis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 09 24 09.22580 |
| Declination | −80° 47′ 12.7597″ |
| Apparent magnitude (V) | 5.34 |
| Characteristics | |
| Spectral type | F3/5 III/V |
| U−B color index | +0.01 |
| B−V color index | +0.454±0.003 |
| Astrometry | |
| Radial velocity (Rv) | −3.57±0.66 km/s |
| Proper motion (μ) | RA: -138.690 mas/yr Dec.: +134.928 mas/yr |
| Parallax (π) | 17.3878 ± 0.0925 mas |
| Distance | 187.6 ± 1.0 ly (57.5 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.52 |
| Details | |
| Radius | 3.63+0.10 −0.13 R☉ |
| Luminosity | 20.244±0.136 L☉ |
| Temperature | 6,429+63 −90 K |
| Metallicity | −0.04 dex |
| Rotational velocity (v sin i) | 129.7 km/s |
| Age | 1.2±0.1 Gyr |
| Other designations | |
| ι Cha, CD−80°329, FK5 2753, GC 13066, HD 82554, HIP 46107, HR 3795, SAO 258530 | |
| Database references | |
| SIMBAD | data |
ι Chamaeleontis, Latinized as Iota Chamaeleontis, is a single star in the southern circumpolar constellation of Chamaeleon. It is visible to the naked eye as a dim, yellow-white hued point of light, having an apparent magnitude of about 5.3. Based upon parallax measurements, this star is around 188 light years away from the Sun, but it is drifting closer with a radial velocity of −4 km/s.
Spectra of the star taken in different years have been given types of F3IV/V and F5III, leading to a mean published type of F3/5 III/V, with the suspicion that the spectrum is variable. It is an F-type star, likely an evolving subgiant. It is 1.2 billion years old with 3.6 times the Sun's radius. The star has a high rate of spin with a projected rotational velocity of 130 km/s, which is giving it an oblate shape with an equatorial bulge some 9% larger than the polar radius. It is radiating over 20 times the Sun's luminosity from its photosphere at an effective temperature of 6,429 K. An infrared excess suggests a circumstellar disk of dust is orbiting at a distance of 8.3 AU from the star with a mean temperature of 200 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
- Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
- Nordström, B.; et al. (2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs". Astronomy and Astrophysics. 418: 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. S2CID 11027621.
- ^ Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
- "iot Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 25 January 2016.
- 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- Allen, J. S. "The Classification of Stellar Spectra". UCL Department of Physics and Astronomy: Astrophysics Group. Retrieved 1 January 2014.
- van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2. S2CID 119273474.
- Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series. 225 (1): 24. arXiv:1606.01134. Bibcode:2016ApJS..225...15C. doi:10.3847/0067-0049/225/1/15. S2CID 118438871. 15.
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