Zeta1 Antliae
Location of ζ1 Antliae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Antlia
Right ascension 09h 30m 46.09678s[1]
Declination −31° 53′ 21.1911″[1]
Apparent magnitude (V) 5.76[2] (6.20/7.01)[3]
Characteristics
Spectral type A0 V + A2 V[3]
U−B color index +0.05[2]
B−V color index +0.05[2]
Astrometry
ζ1 Ant A
Proper motion (μ) RA: +19.044[4] mas/yr
Dec.: −22.448[4] mas/yr
Parallax (π)9.3166 ± 0.0605 mas[4]
Distance350 ± 2 ly
(107.3 ± 0.7 pc)
ζ1 Ant B
Proper motion (μ) RA: +20.756[5] mas/yr
Dec.: −21.530[5] mas/yr
Parallax (π)9.3970 ± 0.0529 mas[5]
Distance347 ± 2 ly
(106.4 ± 0.6 pc)
Details
ζ1 Ant A
Mass2.46[6] M☉
Radius2.26[6] R☉
Luminosity39.8[6] L☉
Surface gravity (log g)4.1[6] cgs
Temperature9,641[6] K
Rotational velocity (v sin i)204[7] km/s
ζ1 Ant B
Mass2.23[6] M☉
Radius1.74[6] R☉
Luminosity16.9[6] L☉
Surface gravity (log g)4.3[6] cgs
Temperature8,872[6] K
Rotational velocity (v sin i)50[7] km/s
Other designations
HIP 46657, CD−31°7355, CCDM 09308-3153, PPM 286548[8]
ζ1 Ant A: GC 13137, HD 82384, HR 3781, SAO 200445
ζ1 Ant B: GC 13135, HD 82383, HR 3780, SAO 200444
Database references
SIMBADζ1 Ant A
ζ1 Ant B

Zeta1 Antliae is the Bayer designation for a binary star[3] system in the southern constellation of Antlia. Based upon parallax measurements, the pair are located at a distance of roughly 350 light-years (110 parsecs) from Earth.[1] They have apparent magnitudes of +6.20 and +7.01 and are separated by 8.042 arcseconds.[3] The apparent magnitude of the combined system is +5.76,[2] which is bright enough to be seen with the naked eye in suitably dark skies.

The two system components A and B are both A-type main sequence stars,[3] hotter, larger, and more luminous than the Sun. The primary is spinning rapidly and the secondary relatively slowly.[7] The primary has a mass of 2.46 M☉, an effective temperature of 9,641 K, a radius of 2.26 R☉, and a bolometric luminosity of 39.8 L☉. The secondary has a mass of 2.23 M☉, an effective temperature of 8,872 K, a radius of 1.74 R☉, and a bolometric luminosity of 16.9 L☉.[6]

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 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. 1 2 3 4 5 Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  4. 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.
  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 3 4 5 6 7 8 9 10 11 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.
  7. 1 2 3 Royer, F.; et al. (January 2012), "Rotational velocities of A-type stars. I. Measurement of v sin i in the southern hemisphere", Astronomy and Astrophysics, 381: 105–121, arXiv:astro-ph/0110490, Bibcode:2002A&A...381..105R, doi:10.1051/0004-6361:20011422, S2CID 13133418.
  8. ↑ "IDS 09265-3127 AB -- Double or multiple star", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-06-27.
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