 The constellation Caelum near the horizon, with the four main stars marked by a line | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum |
| Right ascension | 05 04 26.19316 |
| Declination | −35° 42′ 17.7574″ |
| Apparent magnitude (V) | 6.28 – 6.39 (6.43 + 9.65) |
| Characteristics | |
| Spectral type | F2 IV/V |
| B−V color index | 0.311±0.006 |
| Variable type | δ Sct |
| Astrometry | |
| Radial velocity (Rv) | +6.4±0.8 km/s |
| Proper motion (μ) | RA: +28.39 mas/yr Dec.: +41.71 mas/yr |
| Parallax (π) | 9.5567 ± 0.0583 mas |
| Distance | 341 ± 2 ly (104.6 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.36 |
| Details | |
| Mass | 1.52 M☉ |
| Radius | 3.43±0.32 R☉ |
| Luminosity | 23.65 L☉ |
| Surface gravity (log g) | 3.80 cgs |
| Temperature | 7,227±246 K |
| Rotational velocity (v sin i) | 69.0±1.0 km/s |
| Age | 961 Myr |
| Other designations | |
| γ Cae, γ Caeli, X Caeli, BD+27°2400, GC 6214, HD 32846, HIP 23596, HR 1653, SAO 195534, CCDM 05044-3542, WDS J05044-3542AB | |
| Database references | |
| SIMBAD | data |
X Caeli, or Gamma Caeli, is a binary star system in the southern constellation of Caelum. It is barely visible to the naked eye with an apparent visual magnitude of 6.32. based upon an annual parallax shift of 9.6 mas, it is located 341 light-years from Earth. The system is moving further away with a heliocentric radial velocity of +6 km/s.
The yellow-white-hued primary, component A, has an apparent magnitude of +6.32 and stellar classification of F2 IV/V, showing mixed traits of an F-type main-sequence star and a subgiant. It is classified as a Delta Scuti-type variable star and its brightness varies from magnitude +6.28 to +6.39 with a period of 3.25 hours. A 2000 observing campaign identified at least six independent pulsation modes for this variation. The companion star, component B, has an apparent magnitude of +9.65 and, as of 2000, is at an angular separation of 0.890″ along a position angle of 183°.
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.
- VSX:Detail for X Cae, retrieved 2018-08-24.
- ^ 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.
- ^ Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ 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.
- Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
- ^ van Leeuwen, F. (November 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.
- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ Mantegazza, L.; et al. (February 2000), "Simultaneous intensive photometry and high resolution spectroscopy of delta Scuti stars. IV. An improved picture of the pulsational behaviour of X Caeli", Astronomy and Astrophysics, 354: 112–124, arXiv:astro-ph/9911337, Bibcode:2000A&A...354..112M.
- "HD 32846". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 August 2018.
- Mantegazza, L.; Poretti, E. (August 1996), "Simultaneous intensive photometry and high resolution spectroscopy of δ Scuti stars. II. X Caeli: a star with unusual spectral features", Astronomy & Astrophysics, 312: 855–864, Bibcode:1996A&A...312..855M.
External links
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