X Caeli
Star in the constellation Caelum
title: "X Caeli" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["f-type-main-sequence-stars", "delta-scuti-variables", "binary-stars", "caelum", "bayer-objects", "bright-star-catalogue-objects", "durchmusterung-objects", "henry-draper-catalogue-objects", "hipparcos-objects", "objects-with-variable-star-designations"] description: "Star in the constellation Caelum" topic_path: "science/astronomy" source: "https://en.wikipedia.org/wiki/X_Caeli" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Star in the constellation Caelum ::
| name = X Caeli | epoch = J2000 | constell = Caelum | ra = | dec = | appmag_v = 6.286.39 (6.43 + 9.65) | type = | class = F2 IV/V | b-v = | u-b = | variable = δ Sct | radial_v = | prop_mo_ra = +28.361 | prop_mo_dec = +40.338 | pm_footnote = | parallax = 9.7026 | p_error = 0.0221 | parallax_footnote = | absmag_v = 1.36 | component1 = X Cae A | mass = 1.52 | radius = | luminosity = 23.65 | gravity = 3.80 | temperature = | metal_fe = | rotational_velocity = | age_myr = 961 | names = | Simbad = HD+32846
X Caeli is a binary star 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. Based upon an annual parallax shift of , it is located at a distance of 336 ly from Earth. The system is moving further away from the Sun with a radial velocity of +6 km/s.
Properties
::figure[src="https://upload.wikimedia.org/wikipedia/commons/9/93/XCaeLightCurve.png" caption="visual-band]] [[light curve]] for X Caeli, adapted from Mantegazza and Poretti (1996)"] ::
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. The spectral lines display a narrow absorption core that suggests the presence of a circumstellar shell.
This star is classified as a Delta Scuti variable with a brightness varies from magnitude over a period of 3.25 hours. A 2000 observing campaign identified at least six independent pulsation modes for this variation. It has 1.5 times the mass of the Sun and 3.4 times the Sun's radius. This star is radiating 24 times the luminosity of the Sun from its photosphere at an effective temperature of 7,227 K. It is nearly a billion years old, with a relatively high rate of rotation, showing a projected rotational velocity of 69 km/s.
The companion star, component B, has an apparent magnitude of +9.65 and, as of 2000, is at an angular separation of along a position angle of 183°. The orbital period for this binary star system is unknown.
References
| 4825052919883631616 | mode=cs2 | postscript=. }}
| title=Simultaneous intensive photometry and high resolution spectroscopy of δ Scuti stars. II. X Caeli: a star with unusual spectral features | last1=Mantegazza | first1=L. | last2=Poretti | first2=E. | journal=Astronomy & Astrophysics | date=August 1996 | volume=312 | pages=855–864 | bibcode=1996A&A...312..855M }}
| mode=cs2 | postscript=. | access-date=24 August 2018 }}
| title=General catalogue of variable stars: Version GCVS 5.1 | last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V | last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N | last5=Pastukhova | first5=E. N | journal=Astronomy Reports | volume=61 | pages=80–88 | year=2017 | issue=1 | postscript=. | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}
| title=The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | doi=10.1088/0004-637X/804/2/146 | postscript=. | arxiv=1501.03154 | bibcode=2015ApJ...804..146D | s2cid=33401607 }}
| title=Simultaneous intensive photometry and high resolution spectroscopy of delta Scuti stars. IV. An improved picture of the pulsational behaviour of X Caeli | display-authors=1 | last1=Mantegazza | first1=L. | last2=Zerbi | first2=F. M. | last3=Sacchi | first3=A. | journal=Astronomy and Astrophysics | postscript=. | volume=354 | pages=112–124 | date=February 2000 | bibcode=2000A&A...354..112M | arxiv=astro-ph/9911337 }}
| last1=Fabricius | first1=C. | last2=Makarov | first2=V. V. | title=Two-colour photometry for 9473 components of close Hipparcos double and multiple stars | journal=Astronomy and Astrophysics | volume=356 | pages=141–145 | date=April 2000 | bibcode=2000A&A...356..141F | postscript=. }}
| title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | location=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}
| last1=Gontcharov | first1=G. A. | title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system | journal=Astronomy Letters | postscript=. | volume=32| issue=11| pages=759–771| date=November 2006 | doi = 10.1134/S1063773706110065 | bibcode=2006AstL...32..759G | arxiv=1606.08053 | s2cid=119231169
|postscript=. |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=4518|title=VSX:Detail for X Cae|access-date=2018-08-24}}
| title=Catalogue and properties of δ Scuti stars in binaries | last1=Liakos | first1=Alexios | last2=Niarchos | first2=Panagiotis | journal=Monthly Notices of the Royal Astronomical Society | volume=465 | issue=1 | pages=1181–1200 | date=February 2017 | doi=10.1093/mnras/stw2756 | doi-access=free | arxiv=1611.00200 | bibcode=2017MNRAS.465.1181L }}
| title=Pulsational behaviour of the delta Scuti star X Caeli | last1=Mantegazza | first1=L. | last2=Poretti | first2=E. | journal=Astronomy and Astrophysics | volume=255 | pages=153–157 | date=February 1992 | bibcode=1992A&A...255..153M }}
References
- {{Cite XHIP. 23596
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