Astronomy:X Caeli
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 05h 04m 26.157s[2] |
| Declination | −35° 42′ 18.38″[2] |
| Apparent magnitude (V) | 6.28 – 6.39[3] (6.43 + 9.65)[4] |
| Characteristics | |
| Spectral type | F2 IV/V[5] |
| B−V color index | 0.311±0.006[1] |
| Variable type | δ Sct[6] |
| Astrometry | |
| Radial velocity (Rv) | +6.4±0.8[7] km/s |
| Proper motion (μ) | RA: +28.361[2] mas/yr Dec.: +40.338[2] mas/yr |
| Parallax (π) | 9.7026 ± 0.0221[2] mas |
| Distance | 336.2 ± 0.8 ly (103.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 1.36[1] |
| Details | |
| X Cae A | |
| Mass | 1.52[8] M☉ |
| Radius | 3.43±0.32[9] R☉ |
| Luminosity | 23.65[1] L☉ |
| Surface gravity (log g) | 3.80[8] cgs |
| Temperature | 7,227±246[8] K |
| Rotational velocity (v sin i) | 69.0±1.0[9] km/s |
| Age | 961[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
X Caeli is a binary star[11] system in the southern constellation of Caelum. It has the Bayer designation Gamma2 Caeli, which is Latinized from γ2 Caeli and abbreviated Gamma2 Cae or γ2 Cae; X Caeli is the system's variable star designation. This system is barely visible to the naked eye with a combined apparent visual magnitude of 6.32.[1] Based upon an annual parallax shift of 9.7 mas,[2] it is located at a distance of 336 light-years (103 pc) from Earth. The system is moving further away from the Sun with a radial velocity of +6 km/s.[7]
Properties
The yellow-white-hued primary, component A, has an apparent magnitude of +6.32 and stellar classification of F2 IV/V,[5] showing mixed traits of an F-type main-sequence star and a subgiant. The spectral lines display a narrow absorption core that suggests the presence of a circumstellar shell.[12]
This star is classified as a Delta Scuti variable with a brightness varies from magnitude 6.28 to 6.39 over a period of 3.25 hours. A 2000 observing campaign identified at least six independent pulsation modes for this variation.[9][13] It has 1.5[8] times the mass of the Sun and 3.4 times the Sun's radius.[9] This star is radiating 24[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,227 K.[8] It is nearly a billion years old,[8] with a relatively high rate of rotation, showing a projected rotational velocity of 69 km/s.[9]
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°.[4] The orbital period for this binary star system is unknown.[11]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ VSX:Detail for X Cae, https://www.aavso.org/vsx/index.php?view=detail.top&oid=4518, retrieved 2018-08-24.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ↑ Samus', N. N et al. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 7.0 7.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 8.6 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 9.0 9.1 9.2 9.3 9.4 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, Bibcode: 2000A&A...354..112M.
- ↑ "HD 32846". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+32846.
- ↑ 11.0 11.1 Liakos, Alexios; Niarchos, Panagiotis (February 2017), "Catalogue and properties of δ Scuti stars in binaries", Monthly Notices of the Royal Astronomical Society 465 (1): 1181–1200, doi:10.1093/mnras/stw2756, Bibcode: 2017MNRAS.465.1181L.
- ↑ 12.0 12.1 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.
- ↑ Mantegazza, L.; Poretti, E. (February 1992), "Pulsational behaviour of the delta Scuti star X Caeli", Astronomy and Astrophysics 255: 153–157, Bibcode: 1992A&A...255..153M.
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