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Upsilon Ophiuchi

March 10, 2023

Upsilon Ophiuchi is a triple star[12] system in the equatorial constellation of Ophiuchus. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.62.[2] The distance to this system is approximately 134 light years based on parallax.[1] It is drifting closer with a radial velocity of −30.6 km/s.[5]

Upsilon Ophiuchi
Location of υ Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 16h 27m 48.18720s[1]
Declination −8° 22′ 18.2245″[1]
Apparent magnitude (V) 4.62[2]
Characteristics
Spectral type kA2hA5VmA5[3]
U−B color index +0.06[4]
B−V color index +0.16[4]
Astrometry
Radial velocity (Rv)−30.60[5] km/s
Proper motion (μ) RA: −67.49[1] mas/yr
Dec.: −11.75[1] mas/yr
Parallax (π)24.42 ± 0.91 mas[1]
Distance134 ± 5 ly
(41 ± 2 pc)
Absolute magnitude (MV)1.75[2]
Orbit[6]
PrimaryAa
CompanionAb
Period (P)27.218±0.0005 d
Semi-major axis (a)≥ 0.0583 AU
Eccentricity (e)0.744±0.002
Periastron epoch (T)2,438,914.84±0.01 JD
Argument of periastron (ω)
(secondary)		333.7±0.7°
Semi-amplitude (K1)
(primary)		34.9±0.3 km/s
Semi-amplitude (K2)
(secondary)		41.1±0.3 km/s
Orbit[7]
PrimaryA
CompanionB
Period (P)82.8±1.4 yr
Semi-major axis (a)0.79±0.03″
Eccentricity (e)0.45±0.03
Inclination (i)31.2±5.7°
Longitude of the node (Ω)86.8±6.9°
Periastron epoch (T)B 1994.1±1.0
Argument of periastron (ω)
(secondary)		177.9±7.4°
Details
Mass1.94[8] M☉
Radius1.9[8] R☉
Luminosity16.56[2] L☉
Surface gravity (log g)4.45[9] cgs
Temperature8,364[9] K
Metallicity [Fe/H]+0.14[2] dex
Rotational velocity (v sin i)44[10] km/s
Other designations
Alkarab, υ Oph, 3 Ophiuchi, BD−08°4243, FK5 3299, GC 22134, HD 148367, HIP 80628, HR 6129, SAO 141187, CCDM J16278-0822AB, WDS J16278-0822[11]
Database references
SIMBADdata

The variable radial velocity of the brighter component was first observed by H. A. Abt in 1961. It is a double-lined spectroscopic binary system with an orbital period of 27.2 days and an eccentricity of 0.74.[6] They have a combined magnitude of 4.71. Both components are similar stars with a combined stellar classification of kA2hA5VmA5, and one or both are Am stars.[3] The third component has an 82.8 year orbit with the inner pair at an eccentricity of 0.45.[7] The system is a source for X-ray emission.[13]

References

  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  2. ^ a b c d e 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. S2CID 119257644. Vizier catalog entry
  3. ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. ^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. ISBN 9780598216885. LCCN 54001336.
  6. ^ a b Gutmann, F. (1965). "A study of the spectroscopic binary 3nu Ophiuchi (HD 148367)". Publications of the Dominion Astrophysical Observatory Victoria. 12: 391–399. Bibcode:1965PDAO...12..391G.
  7. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 24 May 2017.
  8. ^ a b Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  9. ^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607. Vizier catalog entry
  10. ^ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  11. ^ "ups Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-21.{{cite web}}: CS1 maint: postscript (link)
  12. ^ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976. Vizier catalog entry
  13. ^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429

March 10, 2023
upsilon, ophiuchi, triple, star, system, equatorial, constellation, ophiuchus, white, faintly, visible, naked, with, apparent, visual, magnitude, distance, this, system, approximately, light, years, based, parallax, drifting, closer, with, radial, velocity, lo. Upsilon Ophiuchi is a triple star 12 system in the equatorial constellation of Ophiuchus It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4 62 2 The distance to this system is approximately 134 light years based on parallax 1 It is drifting closer with a radial velocity of 30 6 km s 5 Upsilon OphiuchiLocation of y Ophiuchi circled Observation dataEpoch J2000 Equinox J2000Constellation OphiuchusRight ascension 16h 27m 48 18720s 1 Declination 8 22 18 2245 1 Apparent magnitude V 4 62 2 CharacteristicsSpectral type kA2hA5VmA5 3 U B color index 0 06 4 B V color index 0 16 4 AstrometryRadial velocity Rv 30 60 5 km sProper motion m RA 67 49 1 mas yr Dec 11 75 1 mas yrParallax p 24 42 0 91 mas 1 Distance134 5 ly 41 2 pc Absolute magnitude MV 1 75 2 Orbit 6 PrimaryAaCompanionAbPeriod P 27 218 0 0005 dSemi major axis a 0 0583 AUEccentricity e 0 744 0 002Periastron epoch T 2 438 914 84 0 01 JDArgument of periastron w secondary 333 7 0 7 Semi amplitude K1 primary 34 9 0 3 km sSemi amplitude K2 secondary 41 1 0 3 km sOrbit 7 PrimaryACompanionBPeriod P 82 8 1 4 yrSemi major axis a 0 79 0 03 Eccentricity e 0 45 0 03Inclination i 31 2 5 7 Longitude of the node W 86 8 6 9 Periastron epoch T B 1994 1 1 0Argument of periastron w secondary 177 9 7 4 DetailsMass1 94 8 M Radius1 9 8 R Luminosity16 56 2 L Surface gravity log g 4 45 9 cgsTemperature8 364 9 KMetallicity Fe H 0 14 2 dexRotational velocity v sin i 44 10 km sOther designationsAlkarab y Oph 3 Ophiuchi BD 08 4243 FK5 3299 GC 22134 HD 148367 HIP 80628 HR 6129 SAO 141187 CCDM J16278 0822AB WDS J16278 0822 11 Database referencesSIMBADdataThe variable radial velocity of the brighter component was first observed by H A Abt in 1961 It is a double lined spectroscopic binary system with an orbital period of 27 2 days and an eccentricity of 0 74 6 They have a combined magnitude of 4 71 Both components are similar stars with a combined stellar classification of kA2hA5VmA5 and one or both are Am stars 3 The third component has an 82 8 year orbit with the inner pair at an eccentricity of 0 45 7 The system is a source for X ray emission 13 References Edit a b c d e f Van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Vizier catalog entry a b c d e 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 S2CID 119257644 Vizier catalog entry a b Abt Helmut A Morrell Nidia I 1995 The Relation between Rotational Velocities and Spectral Peculiarities among A Type Stars Astrophysical Journal Supplement 99 135 Bibcode 1995ApJS 99 135A doi 10 1086 192182 a b Mallama A 2014 Sloan Magnitudes for the Brightest Stars The Journal of the American Association of Variable Star Observers 42 2 443 Bibcode 2014JAVSO 42 443M Vizier catalog entry a b Wilson R E 1953 General Catalogue of Stellar Radial Velocities Carnegie Institute Washington D C Publication Carnegie Institution for Science Bibcode 1953GCRV C 0W ISBN 9780598216885 LCCN 54001336 a b Gutmann F 1965 A study of the spectroscopic binary 3nu Ophiuchi HD 148367 Publications of the Dominion Astrophysical Observatory Victoria 12 391 399 Bibcode 1965PDAO 12 391G a b Sixth Catalog of Orbits of Visual Binary Stars United States Naval Observatory Retrieved 24 May 2017 a b Allende Prieto C Lambert D L 1999 Fundamental parameters of nearby stars from the comparison with evolutionary calculations Masses radii and effective temperatures Astronomy and Astrophysics 352 555 562 arXiv astro ph 9911002 Bibcode 1999A amp A 352 555A Vizier catalog entry a b David Trevor J Hillenbrand Lynne A 2015 The Ages of Early Type Stars Stromgren Photometric Methods Calibrated Validated Tested and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 arXiv 1501 03154 Bibcode 2015ApJ 804 146D doi 10 1088 0004 637X 804 2 146 S2CID 33401607 Vizier catalog entry Hoffleit D Warren W H 1995 VizieR Online Data Catalog Bright Star Catalogue 5th Revised Ed Hoffleit 1991 VizieR On line Data Catalog V 50 Originally Published in 1964BS C 0H 5050 Bibcode 1995yCat 5050 0H ups Oph SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 10 21 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link Eggleton P P Tokovinin A A 2008 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 Vizier catalog entry Schroder C Schmitt J H M M November 2007 X ray emission from A type stars Astronomy and Astrophysics 475 2 677 684 Bibcode 2007A amp A 475 677S doi 10 1051 0004 6361 20077429 Retrieved from https en wikipedia org w index php title Upsilon Ophiuchi amp oldid 1079518903, wikipedia, wiki, book, books, library,

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