X Caeli
Star in the constellation Caelum
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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]
| Observation data Epoch J2000 Equinox 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 mas/yr[2] Dec.: +40.338 mas/yr[2] |
| Parallax (π) | 9.7026±0.0221 mas[2] |
| 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 | |
| γ2 Cae, γ2 Caeli, X Caeli, CD−35°2090, GC 6214, HD 32846, HIP 23596, HR 1653, SAO 195534, CCDM 05044-3542, WDS J05044-3542AB[10] | |
| Database references | |
| SIMBAD | data |
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]