Delta Antliae
Star in the constellation Antlia
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Delta Antliae is a binary star[5] system in the southern constellation of Antlia. Its Bayer designation is Latinized from δ Antliae, and is abbreviated Del Ant or δ Ant, respectively. The combined apparent visual magnitude of the system is +5.57,[2] allowing it to be viewed from the suburbs with the naked eye. Based on the parallax shift of this system, it is located at a distance of approximately 470 light-years from Earth.[1] The system is reduced in magnitude by 0.03 due to extinction caused by intervening gas and dust.[3]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h 29m 35.379s[1] |
| Declination | −30° 36′ 25.43″[1] |
| Apparent magnitude (V) | +5.55[2] (5.58/9.65)[3] |
| Characteristics | |
| Spectral type | B9.5 V + F9 Ve[3] |
| U−B color index | −0.18[2] |
| B−V color index | −0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | +14[4] km/s |
| Proper motion (μ) | RA: −29.598 mas/yr[1] Dec.: +1.704 mas/yr[1] |
| Parallax (π) | 7.0076±0.2204 mas[1] |
| Distance | 470 ± 10 ly (143 ± 4 pc) |
| Absolute magnitude (MV) | –0.37[5] |
| Details | |
| δ Ant A | |
| Mass | 3.35±0.15[5] M☉ |
| Luminosity | 200[5] L☉ |
| Temperature | 11,117[5] K |
| Rotational velocity (v sin i) | 27[6] km/s |
| Age | 214[5] Myr |
| δ Ant B | |
| Mass | 1.22–1.31[7] M☉ |
| Luminosity | 2.58[7] L☉ |
| Temperature | 5,948[7] K |
| Other designations | |
| δ Ant, Del Ant, NSV 4876, CD−29 8383, HD 90972, HIP 51376, HR 4118, SAO 201442, PPM 287759[8] | |
| Database references | |
| SIMBAD | data |
The primary component of the system has a stellar classification of B9.5 V, indicating that it is a B-type main sequence star. This star has an estimated 3.4[5] times the mass of the Sun. It is radiating around 200[5] times as much luminosity as the Sun from its photosphere at an effective temperature of 11,117 K.[5] At this heat, it shines with the characteristic blue-white hue of a B-type star.[9] The companion is an F-type main sequence star with a classification of F9 Ve, where the 'e' indicates that there are emission lines in the spectrum.
This is a young system with age estimates of 120[10] and 214[5] million years, with the secondary still in the post T Tauri stage.[7] The two stars are separated by 11 arcseconds,[3] corresponding to a physical separation of about 2,200 AU.[10]