74 Ophiuchi

In the area of ​​74 Ophiuchi, numerous investigations, discussions and debates have arisen over the years. Since its inception, 74 Ophiuchi has been the subject of interest not only at an academic level, but also in society in general. Its impact has been such that it has permeated different aspects of daily life, from culture, politics, economy, to technology. In this article, we will thoroughly explore the importance of 74 Ophiuchi, its implications and its influence in today's world. From its origins to the present, we will analyze its evolution and its role in contemporary society.

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 -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

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]

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

  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