BF Antliae
Star in the constellation Antlia
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BF Antliae, or HD 86301, is a variable star in the southern constellation of Antlia. It has a baseline apparent visual magnitude of 6.32,[4] which indicates it lies near the lower limit of naked eye visibility for faint stars. The distance to BF Ant, as determined from its annual parallax shift of 6.9 mas,[3] is 473 light years. It is moving further away with a heliocentric radial velocity of +18 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Antlia[2] |
| Right ascension | 09h 56m 54.09215s[3] |
| Declination | −27° 28′ 30.5575″[3] |
| Apparent magnitude (V) | 6.32 (+0.01)[4] |
| Characteristics | |
| Spectral type | A4 V[4] |
| B−V color index | 0.173±0.008[2] |
| Variable type | δ Sct[4] |
| Astrometry | |
| Radial velocity (Rv) | +18.2±0.8[5] km/s |
| Proper motion (μ) | RA: −72.627[3] mas/yr Dec.: +23.234[3] mas/yr |
| Parallax (π) | 6.8977±0.0578 mas[3] |
| Distance | 473 ± 4 ly (145 ± 1 pc) |
| Absolute magnitude (MV) | 0.33[2] |
| Details[6] | |
| Mass | 2.41±0.05 M☉ |
| Luminosity | 66.8+11.7 −10.0 L☉ |
| Temperature | 7,745+53 −71 K |
| Rotational velocity (v sin i) | 218.9±1.7[7] km/s |
| Other designations | |
| BF Ant, CD−26°7551, HD 86301, HIP 48776, HR 3933, SAO 178216[8] | |
| Database references | |
| SIMBAD | data |
In 2002, Gerald Handler and Robert R. Shobbrook discovered that the brightness of the star varies.[9] It was given its variable star designation, BF Antliae, in 2006.[10] It is an A-type main-sequence star with a stellar classification of A4 V[4] that is at the end of its main sequence lifespan.[6] It is a Delta Scuti variable that varies by 0.01 of a magnitude.[4] These are short-period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.[11] Handler and Shobbrook noted that the star lies near the "hot luminous border of the δ Scuti instability strip", and it appears "multiperiodic with a time scale of 3.8–6 hours".[9]
BF Antliae is spinning rapidly with a projected rotational velocity of 219 km/s.[7] It has 2.41 times the mass of the Sun and is radiating 67 times the Sun's luminosity from its photosphere at an effective temperature of 7,745 K.[6]