Delta Antliae

Delta Antliae
Diagram showing star positions and boundaries of the Antlia constellation and its surroundings


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: –29.47[1] mas/yr
Dec.: +1.66[1] mas/yr
Parallax (π)6.78 ± 0.74[1] mas
Distanceapprox. 480 ly
(approx. 150 pc)
Absolute magnitude (MV)–0.37[5]
Details
δ Ant A
Mass3.35 ± 0.15[5] M☉
Luminosity200[5] L☉
Temperature11,117[5] K
Rotational velocity (v sin i)27[6] km/s
Age214[5] Myr
Other designations
CD–29 8383, HD 90972, HIP 51376, HR 4118, NSV 4876, SAO 201442.
Database references
SIMBADdata

Delta Antliae (δ Ant, δ Antliae) is the Bayer designation for a binary star[5] 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, is located at a distance of roughly 480 light-years (150 parsecs) 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. 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[5] times the mass of the Sun. It is radiating around 200[5] times as much luminosity as the Sun from its outer atmosphere 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.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. ↑ 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. ↑ 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, 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. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 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.
  6. ↑ 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.
  7. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, retrieved 2012-01-16.

External links