Astronomy:Nu Chamaeleontis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 09h 46m 20.63010s[1] |
| Declination | −76° 46′ 34.0259″[1] |
| Apparent magnitude (V) | 5.43[2] |
| Characteristics | |
| Spectral type | G8III[3] |
| U−B color index | +0.57[4] |
| B−V color index | +0.89[4] |
| Astrometry | |
| Radial velocity (Rv) | 11.18±0.14[5] km/s |
| Proper motion (μ) | RA: +83.013[1] mas/yr Dec.: −56.328[1] mas/yr |
| Parallax (π) | 17.1643 ± 0.048[1] mas |
| Distance | 190.0 ± 0.5 ly (58.3 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.59[2] |
| Details | |
| Mass | 1.64±0.20[2] M☉ |
| Radius | 6.72±0.02[1] R☉ |
| Luminosity | 23.63±0.12[1] L☉ |
| Surface gravity (log g) | +3.07±0.15[2] cgs |
| Temperature | 4,985+5 −4[1] K |
| Rotational velocity (v sin i) | 1.2±1.0[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu Chamaeleontis is a single[7] star in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from ν Chamaeleontis, and abbreviated Nu Cha or ν Cha. This is a yellow-hued star, dimly visible to the naked eye, with an apparent visual magnitude of 5.43.[2] It is located at a distance of 190 light-years (58 pc) from the Sun, based on its parallax,[1] and is drifting further away with a radial velocity of +11 km/s.[5] It has an absolute magnitude of 1.59.[2]
This an aging G-type giant star with a stellar classification of G8III.[3] Having exhausted the supply of hydrogen at its core, it has expanded and cooled off the main sequence; at present it has 6.7[1] times the girth of the Sun. The star has 1.6[2] times the mass of the Sun and is radiating 24 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,985 K.[1] These coordinates are a source for X-ray emission, which is most likely (99.3% chance) coming from the star.[8]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. Bibcode: 1999A&A...352..555A.
- ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. 1. Bibcode: 1975mcts.book.....H.
- ↑ 4.0 4.1 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99. Bibcode: 1966CoLPL...4...99J.
- ↑ 5.0 5.1 5.2 de Medeiros, J. R. et al. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D.
- ↑ "nu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=nu.+Cha.
- ↑ 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.
- ↑ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009). "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources". The Astrophysical Journal Supplement 184 (1): 138–151. doi:10.1088/0067-0049/184/1/138. Bibcode: 2009ApJS..184..138H.
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