HD 165189 and HD 165190 are components of a visual binary star[10] 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.[14]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Australis |
| HD 165189 | |
| Right ascension | 18h 06m 49.89293s[1] |
| Declination | −43° 25′ 30.8009″[1] |
| Apparent magnitude (V) | 5.62±0.01[2] |
| HD 165190 | |
| Right ascension | 18h 06m 49.91494s[3] |
| Declination | −43° 25′ 29.0976″[3] |
| Apparent magnitude (V) | 5.68±0.01[2] |
| Characteristics | |
| HD 165189 | |
| Spectral type | A6 V[4] |
| B−V color index | +0.230[5] |
| HD 165190 | |
| Spectral type | A7 V[4] |
| B−V color index | +0.262[5] |
| Astrometry | |
| Radial velocity (Rv) | −7.8±0.4[6] km/s |
| Absolute magnitude (MV) | +1.81[7] |
| HD 165189 | |
| Proper motion (μ) | RA: +10.915 mas/yr[1] Dec.: −105.835 mas/yr[1] |
| Parallax (π) | 22.7417 ± 0.1025 mas[1] |
| Distance | 143.4 ± 0.6 ly (44.0 ± 0.2 pc) |
| HD 165190 | |
| Proper motion (μ) | RA: −1.187 mas/yr[3] Dec.: −101.243 mas/yr[3] |
| Parallax (π) | 22.6753 ± 0.071 mas[3] |
| Distance | 143.8 ± 0.5 ly (44.1 ± 0.1 pc) |
| Orbit[8][9] | |
| 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 | |
| Mass | 1.59[10] M☉ |
| Radius | 1.7[1] R☉ |
| Luminosity | 8.6[1] L☉ |
| Surface gravity (log g) | 4.25[11] cgs |
| Temperature | 7,600[1] K |
| Metallicity [Fe/H] | −0.25[11] dex |
| Rotational velocity (v sin i) | 130±1[12] km/s |
| HD 165190 | |
| Mass | 1.58[10] M☉ |
| Radius | 1.7[3] R☉ |
| Luminosity | 8.2[3] L☉ |
| Surface gravity (log g) | 4.15[11] cgs |
| Temperature | 7,566[3] K |
| Metallicity [Fe/H] | −0.24[11] dex |
| Rotational velocity (v sin i) | 129±1[12] km/s |
| Age | 813[3] Myr |
| Other designations | |
| HD 165189: HR 6749 | |
| HD 165190: HR 6750 | |
| Database references | |
| SIMBAD | data |
| HD 165189 | |
| HD 165190 | |
The pair orbit each other with a period of 450 years and a large eccentricity of 0.650.[9] They have a projected separation of 70.1 AU.[10] Both components are A-type main-sequence stars; the primary has a stellar classification of A6 V while the secondary is A7 V.[14] They have similar masses of 1.59 and 1.58 times the mass of the Sun, respectively.[10]
References
edit- ^ a b c d e f g 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.
- ^ a b 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.
- ^ a b c d e f g h 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.
- ^ a b 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.
- ^ a b 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.
- ^ 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.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
- ^ 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.
- ^ a b 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.
- ^ a b c d e 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.
- ^ a b c d 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.
- ^ a b 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.
- ^ "CD-43 12272". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-07.
- ^ a b 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.