Astronomy:HR 8526

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Short description: Star in the constellation Octans
HR 8526
Observation data
{{#ifeq:J2000.0 (ICRS)|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0 (ICRS)]]      [[Astronomy:Equinox (celestial coordinates)|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[1] mas/yr
Dec.: +12.835[1] mas/yr
Parallax (π)42.7219 ± 0.0196[1] mas
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
Dec.: −3.785 mas/yr
Parallax (π)42.692 ± 0.2479[3] mas
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
CD−75°1241, CPD−75°1748, HD 212168, HR 8526, WDS J22259-7501AB[19]
A: {{{names1}}}
B: {{{names2}}}
Database references
SIMBADA
B

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]

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°.[20] 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][21] The G0 class has been used as an argument that the two visible components form a purely optical pair,[22] 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[23] located 264 arcseconds away from HR 8526.[20] In 2012, J.A. Caballero identified it as a companion to the AB system, making it a quadruple star system.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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. ↑ 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. ↑ 3.0 3.1 3.2 3.3 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. ↑ 4.0 4.1 4.2 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. 
  5. ↑ 5.0 5.1 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. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G. 
  6. ↑ 6.0 6.1 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. ↑ 7.0 7.1 Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. Bibcode: 2018ApJS..235....6T. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 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. doi:10.1086/430500. ISSN 0067-0049. Bibcode: 2005ApJS..159..141V. 
  10. ↑ 10.0 10.1 10.2 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. Bibcode: 2012Obs...132..176C. 
  11. ↑ 11.0 11.1 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. doi:10.3847/1538-3881/ab24e4. Bibcode: 2019AJ....158...48T. 
  12. ↑ 12.0 12.1 12.2 12.3 12.4 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. doi:10.1088/0004-637X/756/1/46. ISSN 0004-637X. Bibcode: 2012ApJ...756...46R. 
  13. ↑ 13.0 13.1 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. doi:10.1088/0004-637X/720/2/1290. ISSN 0004-637X. Bibcode: 2010ApJ...720.1290G. 
  14. ↑ 14.0 14.1 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. doi:10.1111/j.1365-2966.2012.21873.x. ISSN 0035-8711. Bibcode: 2012MNRAS.427..343M. 
  15. ↑ 15.0 15.1 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. doi:10.1093/mnras/stx1077. ISSN 0035-8711. Bibcode: 2017MNRAS.469.3042N. 
  16. ↑ 16.0 16.1 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. doi:10.1051/0004-6361/202141339. ISSN 0004-6361. Bibcode: 2021A&A...654A.137L. 
  17. ↑ 17.0 17.1 Bensby, T.; Feltzing, S.; Oey, M. S. (February 2014). "Exploring the Milky Way stellar disk". Astronomy & Astrophysics 562: A71. doi:10.1051/0004-6361/201322631. ISSN 0004-6361. Bibcode: 2014A&A...562A..71B. 
  18. ↑ 18.0 18.1 Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 87. doi:10.1088/0004-6256/147/4/87. ISSN 0004-6256. Bibcode: 2014AJ....147...87T. 
  19. ↑ "HR 8526". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+8526. 
  20. ↑ 20.0 20.1 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. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M. 
  21. ↑ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". VizieR On-line Data Catalog. Bibcode: 2014yCat....1.2023S. 
  22. ↑ 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. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  23. ↑ 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. doi:10.1088/0004-6256/136/3/1290. ISSN 0004-6256. Bibcode: 2008AJ....136.1290R. 
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