Astronomy:Delta Antliae

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Short description: Star in the constellation Antlia
δ Antliae
Antlia constellation map.svg
Red circle.svg
Location of δ Antliae (circled)
Observation data
Equinox J2000.0]] (ICRS)
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, PPM 287759
Database references
SIMBADdata

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]

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. 1.0 1.1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V. 
  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, Bibcode1975MNSSA..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, Bibcode2000A&A...359..227H. 
  4. 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, Bibcode1967IAUS...30...57E. 
  5. 5.0 5.1 5.2 5.3 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. Bibcode2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 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, doi:10.1051/0004-6361:20010452, Bibcode2001A&A...372..152H. 
  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, doi:10.1051/0004-6361:20065224, Bibcode2007A&A...463..671R. 
  8. "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.