Astronomy:BF Antliae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Antlia |
| Right ascension | 09h 56m 54.09215s[2] |
| Declination | −27° 28′ 30.5575″[2] |
| Apparent magnitude (V) | 6.32 (+0.01)[3] |
| Characteristics | |
| Spectral type | A4 V[3] |
| B−V color index | 0.173±0.008[4] |
| Variable type | δ Sct[3] |
| Astrometry | |
| Radial velocity (Rv) | +18.2±0.8[5] km/s |
| Proper motion (μ) | RA: −72.627[2] mas/yr Dec.: +23.234[2] mas/yr |
| Parallax (π) | 6.8977 ± 0.0578[2] mas |
| Distance | 473 ± 4 ly (145 ± 1 pc) |
| Absolute magnitude (MV) | 0.33[4] |
| 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 | |
| Database references | |
| SIMBAD | data |
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,[3] which indicates it lies near the lower limit of visibility for faint stars. The distance to BF Ant, as determined from its annual parallax shift of 6.9 mas,[2] is 473 light years. It is moving further away with a heliocentric radial velocity of +18 km/s.[5]
This is an A-type main-sequence star with a stellar classification of A4 V[3] 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.[3] These are short-period (six hours at most) pulsating stars that have been used as standard candles and as subjects to study astroseismology.[9] Handler and Shobbrook (2002) 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".[10]
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]
References
- ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Chang, S.-W. et al. (2013), "Statistical Properties of Galactic δ Scuti Stars: Revisited", The Astronomical Journal 145 (5): 10, doi:10.1088/0004-6256/145/5/132, 132, Bibcode: 2013AJ....145..132C.
- ↑ 4.0 4.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 5.0 5.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, A120, Bibcode: 2012A&A...537A.120Z.
- ↑ 7.0 7.1 Díaz, C. G. et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics 531: A143, doi:10.1051/0004-6361/201016386, Bibcode: 2011A&A...531A.143D.
- ↑ "BF Ant". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BF+Ant.
- ↑ Templeton, Matthew (16 July 2010). "Delta Scuti and the Delta Scuti Variables". Variable Star of the Season. AAVSO (American Association of Variable Star Observers). http://www.aavso.org/vsots_delsct. Retrieved 5 September 2015.
- ↑ Handler, G.; Shobbrook, R. R. (June 2002), "On the relationship between the Delta Scuti and Gamma Doradus pulsators", Monthly Notices of the Royal Astronomical Society 333 (2): 251–262, doi:10.1046/j.1365-8711.2002.05401.x, Bibcode: 2002MNRAS.333..251H.
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