Astronomy:HD 165189 and HD 165190
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Short description: Star in the constellation Corona Australis
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|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[1] mas/yr Dec.: −105.835[1] mas/yr |
| Parallax (π) | 22.7417 ± 0.1025[1] mas |
| Distance | 143.4 ± 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[3] mas |
| 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 |
| 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 | |
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]
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 astronomical unit|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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 4.0 4.1 Corbally, C. J. (August 1984). "Close visual binaries. I - MK classifications". The Astrophysical Journal Supplement Series 55: 657. doi:10.1086/190973. ISSN 0067-0049. Bibcode: 1984ApJS...55..657C.
- ↑ 5.0 5.1 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. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ Izmailov, I. S. (January 2019). "The Orbits of 451 Wide Visual Double Stars". Astronomy Letters (Pleiades Publishing Ltd) 45 (1): 30–38. doi:10.1134/s106377371901002x. ISSN 1063-7737. Bibcode: 2019AstL...45...30I.
- ↑ 9.0 9.1 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.
- ↑ 10.0 10.1 10.2 10.3 10.4 Tokovinin, A.; Kiyaeva, O. (February 2016), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society 456 (2): 2070–2079, doi:10.1093/mnras/stv2825, Bibcode: 2016MNRAS.456.2070T.
- ↑ 11.0 11.1 11.2 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ 12.0 12.1 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. doi:10.1051/0004-6361/201016386. ISSN 0004-6361. Bibcode: 2011A&A...531A.143D.
- ↑ "CD-43 12272". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=CD-43+12272.
- ↑ 14.0 14.1 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, doi:10.1093/mnras/stv1981, Bibcode: 2015MNRAS.454..593B.
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