Zeta2 Antliae

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Zeta2 Antliae
Antlia constellation map.svg
Red circle.svg
Location of ζ2 Antliae (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Antlia
Right ascension 09h 31m 32.15879s [1]
Declination −31° 52′ 18.5989″ [1]
Apparent magnitude  (V)5.91 [2]
Characteristics
Spectral type A9 IV [3]
U−B color index +0.16 [2]
B−V color index +0.23 [2]
Astrometry
Radial velocity (Rv)+19.8 ± 1.6 [4]  km/s
Proper motion (μ)RA: -47.968 ± 0.162 [5]   mas/yr
Dec.: -8.784 ± 0.179 [5]   mas/yr
Parallax (π)8.4565 ± 0.1075  mas [5]
Distance 386 ± 5  ly
(118 ± 2  pc)
Absolute magnitude  (MV)+0.44 [6]
Details
Mass 1.71 [7]   M☉
Radius 4.22 [7]   R☉
Luminosity 49.5 [7]   L☉
Surface gravity (log g)3.42 [7]   cgs
Temperature 7,455 [7]   K
Other designations
CD-31 7369, HD  82513, HIP  46734, HR  3789, SAO  200459, PPM  286565 [8]
Database references
SIMBAD data

Zeta2 Antliae is the Bayer designation for a star in the southern constellation of Antlia, the air pump. With an apparent visual magnitude of 5.91, [2] it is a relatively faint star that requires dark suburban skies for viewing with the naked eye. Parallax measurements show it to be located at a distance of roughly 386 light-years (118 parsecs ) from Earth. [1]

The spectrum of this star matches a stellar classification of A9 IV, [3] where the luminosity class of IV indicate that this is a subgiant star that is evolving away from the main sequence as the supply of hydrogen at its core is becoming exhausted. This is catalogued as an Am star, which means it is a chemically peculiar star that shows strong indications of certain trace metals in its spectrum. [6] The chemical peculiarity is now considered doubtful. [9]

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<span class="mw-page-title-main">Tau Ursae Majoris</span> Binary star in the constellation Ursa Major

Tau Ursae Majoris (τ UMa) is the Bayer designation for a binary star in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye, having an apparent visual magnitude of 4.66. With an annual parallax shift of 25.82 mas, it is located about 126 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.19 due to interstellar dust.

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Zeta<sup>1</sup> Antliae Binary star system in the constellation Antlia.

Zeta1 Antliae is the Bayer designation for a binary star system in the southern constellation of Antlia. Based upon parallax measurements, the pair are located at a distance of roughly 350 light-years from Earth. They have apparent magnitudes of +6.20 and +7.01 and are separated by 8.042 arcseconds. The apparent magnitude of the combined system is +5.76, which is bright enough to be seen with the naked eye in suitably dark skies.

<span class="mw-page-title-main">Mu Ophiuchi</span> Star in the constellation Ophiuchus

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<span class="mw-page-title-main">7 Sagittarii</span> Star in the constellation Sagittarius

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<span class="mw-page-title-main">Epsilon Pyxidis</span> Quadruple star system in the constellation Pyxis

Epsilon Pyxidis (ε Pyxidis) is quadruple star system in the southern constellation of Pyxis. It is faintly visible to the naked eye, having a combined apparent visual magnitude of +5.60. Based upon an annual parallax shift of 15.39 mas as seen from Earth, it is located around 212 light years from the Sun. The system is deemed to be a member of the Sirius supercluster of stars that share a common motion through space.

<span class="mw-page-title-main">V518 Carinae</span> Blue-hued variable star in the constellation Carina

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<span class="mw-page-title-main">Iota Mensae</span> Star in the constellation Mensa

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<span class="mw-page-title-main">2 Cassiopeiae</span> Star in the constellation Cassiopeia

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References

  1. 1 2 3 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, S2CID   18759600.
  2. 1 2 3 4 Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978), "UBVRI photometry of 225 Am stars", The Astronomical Journal, 83: 606–614, Bibcode:1978AJ.....83..606M, doi: 10.1086/112242 .
  3. 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
  4. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053 , Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID   119231169.
  5. 1 2 3 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. 1 2 Hauck, B.; Curchod, A. (December 1980), "Properties of AM stars in the Geneva photometric system", Astronomy and Astrophysics, 92 (3): 289–295, Bibcode:1980A&A....92..289H.
  7. 1 2 3 4 5 Stassun K.G.; et al. (October 2019), "The revised TESS Input Catalog and Candidate Target List", The Astronomical Journal , 158 (4): 138, arXiv: 1905.10694 , Bibcode:2019AJ....158..138S, doi: 10.3847/1538-3881/ab3467 , S2CID   166227927.
  8. ↑ "zet02 Ant". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2012-06-27.
  9. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi: 10.1051/0004-6361/200810788 .
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