Zeta1 Antliae

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.

For other stars with this designation, see Zeta Antliae.
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[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

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. 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. 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. 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. 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. 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. 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. 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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