Wikipedia

HR 8526

HR 8526, also known as HD 212168, is the primary of a triple star located in the southern circumpolar constellation Octans. The star and its companion have apparent magnitudes of 6.12 and 9.36 respectively.[2][4] The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements,[3][1] but is receding with a heliocentric radial velocity of 15 km/s.[8][9]

HR 8526
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
A
Right ascension 22h 25m 51.15504s[1]
Declination −75° 00′ 56.4763″[1]
Apparent magnitude (V) 6.12±0.01[2]
B
Right ascension 22h 25m 56.54954s[3]
Declination −75° 00′ 52.3437″[3]
Apparent magnitude (V) 9.35[4]
Characteristics
A
Spectral type G0 V[5]
U−B color index +0.14[6]
B−V color index +0.64[6]
B
Spectral type K2V[7]
Astrometry
A
Radial velocity (Rv)15±0.2[8] km/s
Proper motion (μ) RA: +57.385 mas/yr[1]
Dec.: +12.835 mas/yr[1]
Parallax (π)42.7219 ± 0.0196 mas[1]
Distance76.34 ± 0.04 ly
(23.41 ± 0.01 pc)
Absolute magnitude (MV)+4.31[4]
B
Radial velocity (Rv)15±0.5[9] km/s
Proper motion (μ) RA: +33.330 mas/yr[3]
Dec.: −3.785 mas/yr[3]
Parallax (π)42.692 ± 0.2479 mas[3]
Distance76.4 ± 0.4 ly
(23.4 ± 0.1 pc)
Absolute magnitude (MV)+6.92[10]
Orbit[11]
PrimaryBa
CompanionBb
Period (P)11 yr
Semi-major axis (a)0.254″
Inclination (i)87.3°
Longitude of the node (Ω)235°
Periastron epoch (T)2022.21
Argument of periastron (ω)
(secondary)		270°
Details
A
Mass1.05+0.04
−0.03[12] M☉
Radius1.17[13] R☉
Luminosity1.57[14] L☉
Surface gravity (log g)4.29±0.04[12] cgs
Temperature5,935[15] K
Metallicity [Fe/H]+0.02±0.06[12] dex
Rotational velocity (v sin i)3.6[16] km/s
Age4.7[17] Gyr
B
Mass0.76 (combined)[18] M☉
Other designations
72 G. Octantis[19], CD−75°1241, CPD−75°1748, HD 212168, HR 8526, WDS J22259-7501AB[20]
A: FK5 3789, GC 31308, HIP 110712, SAO 258036
B: HIP 110719
Database references
SIMBADA
B

This is a Sun-like star with a stellar classification of G0 V.[5] It has 105% the mass of the Sun[12] and 117% its girth.[13] It radiates 157% the luminosity of the Sun[14] from its photosphere at an effective temperature of 5,935 K,[15] giving it a whitish-yellow hue. HR 8526 has an iron abundance similar to the Sun's[12] and spins modestly with a projected rotational velocity of 3.6 km/s.[16] HD 212168 has a similar age to the Sun; the former is 4.7 billion years old[17] while the latter is 4.6 billion years old.

The B subsystem is located 14″ away along a position angle of 78°.[21] It has a combined mass 76% that of the Sun[18] and take roughly 11 years to orbit each other.[11] Spectral classifications for this star vary from G0-V to K2V.[7][22] The G0 class has been used as an argument that the two visible components form a purely optical pair,[23] but this has been dismissed as mis-identification or contamination and that the actual spectral class is early or mid K.[10]

DENIS J222644.3-750342 is a cool M8 red dwarf[24] located 264 arcseconds away from HR 8526.[21] In 2012, J.A. Caballero identified it as a companion to the AB system, making it a quadruple star system.[10]

References

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  1. ^ a b c d e 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.
  2. ^ 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.
  3. ^ a b c d e 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.
  4. ^ a b c 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.
  5. ^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256.
  6. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  7. ^ a b Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. eISSN 1538-4365.
  8. ^ a b 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.
  9. ^ a b Valenti, Jeff A.; Fischer, Debra A. (July 2005). "Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs". The Astrophysical Journal Supplement Series. 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. eISSN 1538-4365. ISSN 0067-0049.
  10. ^ a b c Caballero, J. A.; Montes, D. (2012). "Cool dwarfs in wide multiple systems - Paper 2: A distant M8.5 V companion to HD 212168 AB". The Observatory. 132 (3): 176. arXiv:1203.4272. Bibcode:2012Obs...132..176C.
  11. ^ a b Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A.; Horch, Elliott P.; Briceño, Cesar (8 July 2019). "Speckle Interferometry at SOAR in 2018". The Astronomical Journal. 158 (1): 48. arXiv:1905.10436. Bibcode:2019AJ....158...48T. doi:10.3847/1538-3881/ab24e4. eISSN 1538-3881.
  12. ^ a b c d e Ramírez, I.; Fish, J. R.; Lambert, D. L.; Allende Prieto, C. (13 August 2012). "Lithium Abundances in nearby FGK Dwarf and Subgiant Stars: Internal Destruction, Galactic Chemical Evolution, and Exoplanets". The Astrophysical Journal. 756 (1): 46. arXiv:1207.0499. Bibcode:2012ApJ...756...46R. doi:10.1088/0004-637X/756/1/46. eISSN 1538-4357. ISSN 0004-637X.
  13. ^ a b Ghezzi, L.; Cunha, K.; Smith, V. V.; de Araújo, F. X.; Schuler, S. C.; de la Reza, R. (19 August 2010). "Stellar Parameters and Metallicities of Stars Hosting Jovian and Neptunian Mass Planets: A Possible Dependence of Planetary Mass on Metallicity". The Astrophysical Journal. 720 (2): 1290–1302. arXiv:1007.2681. Bibcode:2010ApJ...720.1290G. doi:10.1088/0004-637X/720/2/1290. eISSN 1538-4357. ISSN 0004-637X.
  14. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. eISSN 1365-2966. ISSN 0035-8711.
  15. ^ a b Netopil, Martin (4 May 2017). "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system". Monthly Notices of the Royal Astronomical Society. 469 (3): 3042–3055. arXiv:1705.00883. Bibcode:2017MNRAS.469.3042N. doi:10.1093/mnras/stx1077. eISSN 1365-2966. ISSN 0035-8711.
  16. ^ a b Llorente de Andrés, F.; Chavero, C.; de la Reza, R.; Roca-Fàbrega, S.; Cifuentes, C. (October 2021). "The evolution of lithium in FGK dwarf stars". Astronomy & Astrophysics. 654: A137. arXiv:2108.05852. Bibcode:2021A&A...654A.137L. doi:10.1051/0004-6361/202141339. eISSN 1432-0746. ISSN 0004-6361.
  17. ^ a b Bensby, T.; Feltzing, S.; Oey, M. S. (February 2014). "Exploring the Milky Way stellar disk". Astronomy & Astrophysics. 562: A71. arXiv:1309.2631. Bibcode:2014A&A...562A..71B. doi:10.1051/0004-6361/201322631. eISSN 1432-0746. ISSN 0004-6361.
  18. ^ a b Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 87. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87. eISSN 1538-3881. ISSN 0004-6256.
  19. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  20. ^ "HR 8526". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 4, 2022.
  21. ^ a b Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. ISSN 0004-6256.
  22. ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". VizieR On-line Data Catalog. Bibcode:2014yCat....1.2023S.
  23. ^ Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  24. ^ Neill Reid, I.; Cruz, Kelle L.; Kirkpatrick, J. Davy; Allen, Peter R.; Mungall, F.; Liebert, James; Lowrance, Patrick; Sweet, Anne (15 August 2008). "Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release". The Astronomical Journal. 136 (3): 1290–1311. arXiv:0806.3413. Bibcode:2008AJ....136.1290R. doi:10.1088/0004-6256/136/3/1290. eISSN 1538-3881. ISSN 0004-6256.
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