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74 Ophiuchi

April 12, 2024

74 Ophiuchi is a suspected binary star[9] in the equatorial constellation of Ophiuchus, near the border with Serpens Cauda. It is visible to the naked eye as a faint, yellow-hued point of light with a combined apparent visual magnitude of 4.85.[2] The system is located at a distance of 238 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +4.4 km/s.[5]

74 Ophiuchi
Location of 74 Ophiuchi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension 18h 20m 52.06435s[1]
Declination 03° 22′ 37.7817″[1]
Apparent magnitude (V) 4.85[2]
Characteristics
Spectral type G8III[3]
U−B color index +0.61[4]
B−V color index +0.91[4]
Astrometry
Radial velocity (Rv)+4.35[5] km/s
Proper motion (μ) RA: −7.646[1] mas/yr
Dec.: +12.546[1] mas/yr
Parallax (π)13.7320 ± 0.2060 mas[1]
Distance238 ± 4 ly
(73 ± 1 pc)
Absolute magnitude (MV)0.34[2]
Details
Mass2.38[6] M☉
Radius10.52+0.32
−1.04[1] R☉
Luminosity66.0±1.2[1] L☉
Surface gravity (log g)2.70[6] cgs
Temperature5,073+271
−76[1] K
Metallicity [Fe/H]-0.21[6] dex
Rotational velocity (v sin i)0.0[5] km/s
Age1.73[7] Gyr
Other designations
74 Oph, BD+03°3680, FK5 1476, GC 25036, GJ 9615 A, HD 168656, HIP 89918, HR 6866, SAO 123377, CCDM J18209+0323A, WDS J18209+0323A[8]
Database references
SIMBADdata

The primary member, designated component A, is an aging giant star with a stellar classification of G8III[3] and an estimated age of 1.73[7] billion years. Having exhausted the hydrogen supply at its core, the star has expanded to 10.5[1] times the Sun's radius. It is a red clump giant,[10] which means it is on the horizontal branch and is generating energy through helium fusion at its core. The star has 2.4[6] times the mass of the Sun and is radiating 66[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of around 5,073 K.[1]

The magnitude 11.5 secondary, component B, lies at an angular separation of 28.1″ from the primary, as of 2008.[9] A visual companion, component C, is magnitude 12.28 and has a separation of 57.9″.[11]

References edit

  1. ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c 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 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey. 5. Bibcode:1999MSS...C05....0H.
  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 c Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135 (1): 209–231. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  6. ^ a b c d Reffert, Sabine; et al. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. S2CID 59334290. Vizier catalog entry
  7. ^ a b Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  8. ^ "74 Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-26.
  9. ^ a b Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  10. ^ Alves, David R. (August 2000). "K-Band Calibration of the Red Clump Luminosity". The Astrophysical Journal. 539 (2): 732–741. arXiv:astro-ph/0003329. Bibcode:2000ApJ...539..732A. doi:10.1086/309278. S2CID 16673121.
  11. ^ Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry

April 12, 2024
ophiuchi, suspected, binary, star, equatorial, constellation, ophiuchus, near, border, with, serpens, cauda, visible, naked, faint, yellow, hued, point, light, with, combined, apparent, visual, magnitude, system, located, distance, light, years, from, based, p. 74 Ophiuchi is a suspected binary star 9 in the equatorial constellation of Ophiuchus near the border with Serpens Cauda It is visible to the naked eye as a faint yellow hued point of light with a combined apparent visual magnitude of 4 85 2 The system is located at a distance of 238 light years from the Sun based on parallax 1 and is drifting further away with a radial velocity of 4 4 km s 5 74 OphiuchiLocation of 74 Ophiuchi circled Observation dataEpoch J2000 Equinox J2000Constellation OphiuchusRight ascension 18h 20m 52 06435s 1 Declination 03 22 37 7817 1 Apparent magnitude V 4 85 2 CharacteristicsSpectral type G8III 3 U B color index 0 61 4 B V color index 0 91 4 AstrometryRadial velocity Rv 4 35 5 km sProper motion m RA 7 646 1 mas yr Dec 12 546 1 mas yrParallax p 13 7320 0 2060 mas 1 Distance238 4 ly 73 1 pc Absolute magnitude MV 0 34 2 DetailsMass2 38 6 M Radius10 52 0 32 1 04 1 R Luminosity66 0 1 2 1 L Surface gravity log g 2 70 6 cgsTemperature5 073 271 76 1 KMetallicity Fe H 0 21 6 dexRotational velocity v sin i 0 0 5 km sAge1 73 7 GyrOther designations74 Oph BD 03 3680 FK5 1476 GC 25036 GJ 9615 A HD 168656 HIP 89918 HR 6866 SAO 123377 CCDM J18209 0323A WDS J18209 0323A 8 Database referencesSIMBADdataThe primary member designated component A is an aging giant star with a stellar classification of G8III 3 and an estimated age of 1 73 7 billion years Having exhausted the hydrogen supply at its core the star has expanded to 10 5 1 times the Sun s radius It is a red clump giant 10 which means it is on the horizontal branch and is generating energy through helium fusion at its core The star has 2 4 6 times the mass of the Sun and is radiating 66 1 times the Sun s luminosity from its swollen photosphere at an effective temperature of around 5 073 K 1 The magnitude 11 5 secondary component B lies at an angular separation of 28 1 from the primary as of 2008 9 A visual companion component C is magnitude 12 28 and has a separation of 57 9 11 References edit a b c d e f g h i j k l Brown A G A et al Gaia collaboration August 2018 Gaia Data Release 2 Summary of the contents and survey properties Astronomy amp Astrophysics 616 A1 arXiv 1804 09365 Bibcode 2018A amp A 616A 1G doi 10 1051 0004 6361 201833051 Gaia DR2 record for this source at VizieR a b c 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 Houk N Swift C 1999 Michigan catalogue of two dimensional spectral types for the HD Stars Michigan Spectral Survey 5 Bibcode 1999MSS C05 0H 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 c Massarotti Alessandro Latham David W Stefanik Robert P Fogel Jeffrey 2008 Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity The Astronomical Journal 135 1 209 231 Bibcode 2008AJ 135 209M doi 10 1088 0004 6256 135 1 209 a b c d Reffert Sabine et al 2015 Precise radial velocities of giant stars Astronomy amp Astrophysics 574 A116 arXiv 1412 4634 Bibcode 2015A amp A 574A 116R doi 10 1051 0004 6361 201322360 hdl 10722 215277 S2CID 59334290 Vizier catalog entry a b Luck R Earle 2015 Abundances in the Local Region I G and K Giants Astronomical Journal 150 3 88 arXiv 1507 01466 Bibcode 2015AJ 150 88L doi 10 1088 0004 6256 150 3 88 S2CID 118505114 74 Oph SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 06 26 a b Eggleton P P Tokovinin A A September 2008 A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869 879 arXiv 0806 2878 Bibcode 2008MNRAS 389 869E doi 10 1111 j 1365 2966 2008 13596 x S2CID 14878976 Alves David R August 2000 K Band Calibration of the Red Clump Luminosity The Astrophysical Journal 539 2 732 741 arXiv astro ph 0003329 Bibcode 2000ApJ 539 732A doi 10 1086 309278 S2CID 16673121 Mason Brian D et al 2001 The 2001 US Naval Observatory Double Star CD ROM I The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Bibcode 2001AJ 122 3466M doi 10 1086 323920 Vizier catalog entry Retrieved from https en wikipedia org w index php title 74 Ophiuchi amp oldid 1154748506, wikipedia, wiki, book, books, library,

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