Astronomy:Delta1 Chamaeleontis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 10h 45m 16.31446s[1] |
| Declination | −80° 28′ 10.5409″[1] |
| Apparent magnitude (V) | 5.47[2] (6.266 + 6.503)[3] |
| Characteristics | |
| Spectral type | K0 III[4] |
| U−B color index | +0.74[2] |
| B−V color index | +0.95[2] |
| Astrometry | |
| Radial velocity (Rv) | +10.7[5] km/s |
| Proper motion (μ) | RA: −17.28[1] mas/yr Dec.: −29.25[1] mas/yr |
| Parallax (π) | 9.36 ± 0.45[1] mas |
| Distance | 350 ± 20 ly (107 ± 5 pc) |
| Absolute magnitude (MV) | +0.32[6] |
| Details | |
| Luminosity | 76[7] L☉ |
| Temperature | 5,052[7] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta1 Chamaeleontis, Latinized from δ1 Chamaeleontis, is a close double star located in the constellation Chamaeleon. It has a combined apparent visual magnitude of 5.47,[2] which is just bright enough for the star to be faintly seen on a dark rural night. With an annual parallax shift of 9.36 mas,[1] it is located around 350 light years from the Sun. This pair is one of two stars named Delta Chamaeleontis, the other being the slightly brighter Delta2 Chamaeleontis located about 6 arcminutes away.[9] Delta Chamaeleontis forms the southernmost component of the constellation's "dipper" or bowl. Together with Gamma Chamaeleontis, they point to a spot that is within 2° of the south celestial pole.[10]
The two components of Delta1 Chamaeleontis have visual magnitudes of 6.3 and 6.5. As of 2000, the pair had an angular separation of 0.783 arcseconds along a position angle of 83.8°.[3] They can be separated by a 7.9 in (20 cm) aperture telescope.[9] The pair is a source of X-ray emission with a flux of 27.4×10−17 W/m2.[11] The stellar classification of Delta1 Chamaeleontis is K0 III,[4] which matches an evolved K-type giant star.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J.
- ↑ 3.0 3.1 Fabricius, C.; Makarov, V. V. (April 2000), "Two-colour photometry for 9473 components of close Hipparcos double and multiple stars", Astronomy and Astrophysics 356: 141–145, Bibcode: 2000A&A...356..141F.
- ↑ 4.0 4.1 Houk, N.; Cowley, A. P. (1975), Catalogue of two-dimensional spectral types for the HD stars, I, University of Michigan, Bibcode: 1975mcts.book.....H.
- ↑ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Carnegie Institute of Washington, D.C.), Bibcode: 1953GCRV..C......0W.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "del01 Cha -- Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=del01+Cha, retrieved 2016-12-11.
- ↑ 9.0 9.1 Inglis, Michael (2012), Astronomy of the Milky Way: The Observer's Guide to the Southern Milky Way, The Patrick Moore Practical Astronomy Series, Springer Science & Business Media, p. 106, ISBN 978-1447106418, https://books.google.com/books?id=Gu4GCAAAQBAJ&pg=PA106.
- ↑ O'Meara, Stephen James (2002), Deep-Sky Companions: The Caldwell Objects, Cambridge University Press, p. 424, ISBN 0521827965, https://books.google.com/books?id=3Hg6YHgx9nAC&pg=PA427.
- ↑ Hunsch, M. et al. (January 1998), "The ROSAT all-sky survey catalogue of optically bright late-type giants and supergiants", Astronomy and Astrophysics Supplement 127 (2): 251–255, doi:10.1051/aas:1998347, Bibcode: 1998A&AS..127..251H.
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