Astronomy:Delta Antliae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: +1.704[1] mas/yr |
| Parallax (π) | 7.0076 ± 0.2204[1] mas |
| 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 | |
| Database references | |
| SIMBAD | data |
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]
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 astronomical unit|AU.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Hurly, P. R. (1975), "Combined-light UBV Photometry of 103 Bright Southern Visual Doubles", Monthly Notes of the Astronomical Society of Southern Africa 34: 7, Bibcode: 1975MNSSA..34....7H.
- ↑ 3.0 3.1 3.2 3.3 Huélamo, N. et al. (July 2000), "X-ray emission from Lindroos binary systems", Astronomy and Astrophysics 359: 227–241, Bibcode: 2000A&A...359..227H.
- ↑ Evans, D. S. (June 20–24, 1966), "The Revision of the General Catalogue of Radial Velocities", in Batten, Alan Henry; Heard, John Frederick, Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30, 30, University of Toronto: International Astronomical Union, p. 57, Bibcode: 1967IAUS...30...57E.
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 Hubrig, S. et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics 372: 152–164, doi:10.1051/0004-6361:20010452, Bibcode: 2001A&A...372..152H.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
- ↑ 7.0 7.1 7.2 7.3 Gerbaldi, M. et al. (2001), "Binary systems with post-T Tauri secondaries", Astronomy & Astrophysics 379 (1): 162–184, doi:10.1051/0004-6361:20011298, ISSN 0004-6361, Bibcode: 2001A&A...379..162G.
- ↑ "Del Ant". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Del+Ant.
- ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16.
- ↑ 10.0 10.1 Wyatt, M. C. et al. (July 2003), "SCUBA observations of dust around Lindroos stars: evidence for a substantial submillimetre disc population", Monthly Notices of the Royal Astronomical Society 342 (3): 876–888, doi:10.1046/j.1365-8711.2003.06595.x, Bibcode: 2003MNRAS.342..876W.
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