| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 10h 45m 47.00487s [1] |
| Declination | −80° 32′ 24.6785″ [1] |
| Apparent magnitude (V) | 4.42 [2] |
| Characteristics | |
| Spectral type | B3 V [3] or B2.5 IV [4] |
| U−B color index | −0.728 [2] |
| B−V color index | −0.192 [2] |
| Astrometry | |
| Radial velocity (Rv) | +22.6 [5] km/s |
| Proper motion (μ) |
RA: −36.86
[1]
mas/
yr Dec.: +5.90 [1] mas/ yr |
| Parallax (π) | 9.30 ± 0.13 mas [1] |
| Distance | 351 ± 5
ly (108 ± 2 pc) |
| Absolute magnitude (MV) | −0.71 [6] |
| Details | |
| Mass | 5.0±0.1 [7] M☉ |
| Radius | 3.9 [8] R☉ |
| Luminosity | 503 [9] L☉ |
| Temperature | 15,873 [9] K |
| Age | 32.6±16.3 [7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta2 Chamaeleontis, Latinized from δ2 Chamaeleontis, is a solitary [11] star located in the southern circumpolar constellation of Chamaeleon. It has an apparent visual magnitude of 4.42, [2] which is bright enough for the star to be seen with the naked eye. Based upon an annual parallax shift of 9.30 mas, [1] it is located around 351 light years from the Sun. This star is one of two stars named Delta Chamaeleontis, the other being the fainter Delta1 Chamaeleontis located about 6 arcminutes away. [12] 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. [13]
This is a B-type main sequence star with a stellar classification of B3 V. [3] However, Hiltner et al. (1969) give a classification of B2.5 IV, [4] which would suggest it is a more evolved subgiant star. It is estimated to have five [7] times the mass of the Sun and 3.9 [8] times the Sun's radius. With an age of 32.6 [7] million years, it is radiating over 500 times the solar luminosity from its outer atmosphere at an effective temperature of 15,873 [9] K. There is a 70% likelihood that this star is a member of Gould's Belt. [14]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement Series, 15: 459, Bibcode: 1968ApJS...15..459G, doi: 10.1086/190168.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313, Bibcode: 1969ApJ...157..313H, doi: 10.1086/150069.
- ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E.
- ^ 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.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883, Bibcode: 2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "del02 Cha – Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-11.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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.
- ^ 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.
- ^ O'Meara, Stephen James (2002), Deep-Sky Companions: The Caldwell Objects, Cambridge University Press, p. 424, ISBN 0521827965.
- ^ Bobylev, V. V.; Bajkova, A. T. (September 2007), "Kinematics of the Scorpius-Centaurus OB association", Astronomy Letters, 33 (9): 571–583, arXiv: 0708.0943, Bibcode: 2007AstL...33..571B, doi: 10.1134/S1063773707090010, S2CID 15785349.
| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Chamaeleon |
| Right ascension | 10h 45m 47.00487s [1] |
| Declination | −80° 32′ 24.6785″ [1] |
| Apparent magnitude (V) | 4.42 [2] |
| Characteristics | |
| Spectral type | B3 V [3] or B2.5 IV [4] |
| U−B color index | −0.728 [2] |
| B−V color index | −0.192 [2] |
| Astrometry | |
| Radial velocity (Rv) | +22.6 [5] km/s |
| Proper motion (μ) |
RA: −36.86
[1]
mas/
yr Dec.: +5.90 [1] mas/ yr |
| Parallax (π) | 9.30 ± 0.13 mas [1] |
| Distance | 351 ± 5
ly (108 ± 2 pc) |
| Absolute magnitude (MV) | −0.71 [6] |
| Details | |
| Mass | 5.0±0.1 [7] M☉ |
| Radius | 3.9 [8] R☉ |
| Luminosity | 503 [9] L☉ |
| Temperature | 15,873 [9] K |
| Age | 32.6±16.3 [7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta2 Chamaeleontis, Latinized from δ2 Chamaeleontis, is a solitary [11] star located in the southern circumpolar constellation of Chamaeleon. It has an apparent visual magnitude of 4.42, [2] which is bright enough for the star to be seen with the naked eye. Based upon an annual parallax shift of 9.30 mas, [1] it is located around 351 light years from the Sun. This star is one of two stars named Delta Chamaeleontis, the other being the fainter Delta1 Chamaeleontis located about 6 arcminutes away. [12] 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. [13]
This is a B-type main sequence star with a stellar classification of B3 V. [3] However, Hiltner et al. (1969) give a classification of B2.5 IV, [4] which would suggest it is a more evolved subgiant star. It is estimated to have five [7] times the mass of the Sun and 3.9 [8] times the Sun's radius. With an age of 32.6 [7] million years, it is radiating over 500 times the solar luminosity from its outer atmosphere at an effective temperature of 15,873 [9] K. There is a 70% likelihood that this star is a member of Gould's Belt. [14]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement Series, 15: 459, Bibcode: 1968ApJS...15..459G, doi: 10.1086/190168.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ^ a b Hiltner, W. A.; et al. (July 1969), "MK Spectral Types for Bright Southern OB Stars", Astrophysical Journal, 157: 313, Bibcode: 1969ApJ...157..313H, doi: 10.1086/150069.
- ^ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick (eds.), Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, vol. 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E.
- ^ 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.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv: 1007.4883, Bibcode: 2011MNRAS.410..190T, doi: 10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv: 1208.2037, Bibcode: 2012MNRAS.427..343M, doi: 10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "del02 Cha – Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-11.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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.
- ^ 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.
- ^ O'Meara, Stephen James (2002), Deep-Sky Companions: The Caldwell Objects, Cambridge University Press, p. 424, ISBN 0521827965.
- ^ Bobylev, V. V.; Bajkova, A. T. (September 2007), "Kinematics of the Scorpius-Centaurus OB association", Astronomy Letters, 33 (9): 571–583, arXiv: 0708.0943, Bibcode: 2007AstL...33..571B, doi: 10.1134/S1063773707090010, S2CID 15785349.