HD 165189 and HD 165190

HD 165189 and HD 165190
Observation data
Epoch J2000      Equinox ICRS
Constellation Corona Australis
HD 165189
Right ascension 18h 06m 49.89293s
Declination −43° 25′ 30.8009″
Apparent magnitude (V) 5.62±0.01
HD 165190
Right ascension 18h 06m 49.91494s
Declination −43° 25′ 29.0976″
Apparent magnitude (V) 5.68±0.01
Characteristics
HD 165189
Evolutionary stage main sequence
Spectral type A6 V
B−V color index +0.230
HD 165190
Evolutionary stage main sequence
Spectral type A7 V
B−V color index +0.262
Astrometry
Radial velocity (Rv)−7.8±0.4 km/s
Absolute magnitude (MV)+1.81
HD 165189
Proper motion (μ) RA: +10.915 mas/yr
Dec.: −105.835 mas/yr
Parallax (π)22.7417±0.1025 mas
Distance143.4 ± 0.6 ly
(44.0 ± 0.2 pc)
HD 165190
Proper motion (μ) RA: −1.187 mas/yr
Dec.: −101.243 mas/yr
Parallax (π)22.6753±0.071 mas
Distance143.8 ± 0.5 ly
(44.1 ± 0.1 pc)
Orbit
Period (P)607±245 yr
Semi-major axis (a)4.63±1.83″
Eccentricity (e)0.896±0.068
Inclination (i)104±6°
Longitude of the node (Ω)84.2±5.5°
Periastron epoch (T)1854.7
Argument of periastron (ω)
(secondary)		282±9°
Details
HD 165189
Mass1.59 M☉
Radius1.7 R☉
Luminosity8.6 L☉
Surface gravity (log g)4.25 cgs
Temperature7,600 K
Metallicity [Fe/H]−0.25 dex
Rotational velocity (v sin i)130±1 km/s
HD 165190
Mass1.58 M☉
Radius1.7 R☉
Luminosity8.2 L☉
Surface gravity (log g)4.15 cgs
Temperature7,566 K
Metallicity [Fe/H]−0.24 dex
Rotational velocity (v sin i)129±1 km/s
Age813 Myr
Other designations
1 G. Coroane Australis, CD−43°12272, GC 24649, HIP 88726, CCDM J18068-4325, WDS J18068-4325
HD 165189: HR 6749
HD 165190: HR 6750
Database references
SIMBADdata
HD 165189
HD 165190

HD 165189 and HD 165190 are components of a visual binary star system located 143 light years away in the southern constellation of Corona Australis. It is visible to the naked eye with the primary having an apparent visual magnitude of 4.929±0.025. The system is a member of the Beta Pictoris Moving Group.

The pair orbit each other with a period of 450 years and a large eccentricity of 0.650. They have a projected separation of 70.1 AU. Both components are A-type main-sequence stars; the primary has a stellar classification of A6 V while the secondary is A7 V. They have similar masses of 1.59 and 1.58 times the mass of the Sun, respectively.

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 9 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
  4. 1 2 3 4 5 6 7 8 9 10 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  5. 1 2 Corbally, C. J. (August 1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series. 55: 657. Bibcode:1984ApJS...55..657C. doi:10.1086/190973. eISSN 1538-4365. ISSN 0067-0049.
  6. 1 2 Myers, J. R.; Sande, C. B.; Miller, A. C.; Warren, W. H.; Tracewell, D. A. (2015). "VizieR Online Data Catalog: SKY2000 Master Catalog, Version 5 (Myers+ 2006)". Vizier Online Data Catalog. Bibcode:2015yCat.5145....0M.
  7. ↑ 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  8. ↑ Izmailov, I. S. (January 2019). "The Orbits of 451 Wide Visual Double Stars". Astronomy Letters. 45 (1). Pleiades Publishing Ltd: 30–38. Bibcode:2019AstL...45...30I. doi:10.1134/s106377371901002x. ISSN 1063-7737. S2CID 149618866.
  9. 1 2 Alzner, A.; Argyle, R. (June 2001). "New orbits for WDS 05248-5219, WDS 18068-4325". IAU Commission 26. (Double Stars) Information Circular. 144: 1–2. Bibcode:2001IAUDS.144R...1A. S2CID 228383265.
  10. 1 2 3 4 5 Tokovinin, A.; Kiyaeva, O. (February 2016), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society, 456 (2): 2070–2079, arXiv:1512.00278, Bibcode:2016MNRAS.456.2070T, doi:10.1093/mnras/stv2825, S2CID 1615080.
  11. 1 2 3 4 Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
  12. 1 2 Díaz, C. G.; González, J. F.; Levato, H.; Grosso, M. (July 2011). "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum". Astronomy & Astrophysics. 531: A143. arXiv:1012.4858. Bibcode:2011A&A...531A.143D. doi:10.1051/0004-6361/201016386. eISSN 1432-0746. ISSN 0004-6361. S2CID 119286673.
  13. ↑ "CD-43 12272". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-07.
  14. 1 2 Bell, Cameron P. M.; et al. (November 2015), "A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood", Monthly Notices of the Royal Astronomical Society, 454 (1): 593–614, arXiv:1508.05955, Bibcode:2015MNRAS.454..593B, doi:10.1093/mnras/stv1981, S2CID 55297862.