Delta Antliae

Delta Antliae (δ Ant, δ Antliae) is the Bayer designation for a binary star[6] system in the southern constellation of Antlia. The combined apparent visual magnitude of the system is +5.57,[2] allowing it to be viewed from the suburbs with the naked eye. Judging by the parallax shift of this system, it is located at a distance of 450 ± 10 light-years from Earth.[5] The system is reduced in magnitude by 0.03 due to extinction caused by intervening gas and dust.[3]

Delta Antliae
Location of δ Antliae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension  10h 29m 35.37844s[1]
Declination –30° 36′ 25.4413″[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: –32.512 ± 0.387[5] mas/yr
Dec.: +0.918 ± 0.318[5] mas/yr
Parallax (π)7.1868 ± 0.2204[5] mas
Distance450 ± 10 ly
(139 ± 4 pc)
Absolute magnitude (MV)–0.37[6]
Details
δ Ant A
Mass3.35 ± 0.15[6] M☉
Luminosity200[6] L☉
Temperature11,117[6] K
Rotational velocity (v sin i)27[7] km/s
Age214[6] Myr
Other designations
CD–29 8383, HD 90972, HIP 51376, HR 4118, NSV 4876, SAO 201442.
Database references
SIMBADdata

The primary component of the system has a stellar classification of B9.5 V, indicating that it is a B-type main sequence star. 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. The two stars are separated by 11 arcseconds.[3]

Delta Antliae A, the brighter member of this system, has an estimated 3.4[6] times the mass of the Sun. It is radiating around 200[6] times as much luminosity as the Sun from its outer atmosphere at an effective temperature of 11,117 K.[6] At this heat, it shines with the characteristic blue-white hue of a B-type star.[8]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. 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. Huélamo, N.; et al. (July 2000), "X-ray emission from Lindroos binary systems", Astronomy and Astrophysics, 359: 227–241, arXiv:astro-ph/0005348, Bibcode:2000A&A...359..227H.
  4. Evans, D. S. (June 20–24, 1966), Batten, Alan Henry; Heard, John Frederick (eds.), The Revision of the General Catalogue of Radial Velocities, University of Toronto: International Astronomical Union, Bibcode:1967IAUS...30...57E.
  5. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  6. 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, arXiv:astro-ph/0103201, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452.
  7. 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, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
  8. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16.
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