41 Ophiuchi

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41 Ophiuchi
Ophiuchus constellation map.svg
Red circle.svg
Location of 41 Ophiuchi (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Ophiuchus
Right ascension 17h 16m 36.68653s [1]
Declination −00° 26′ 43.0915″ [1]
Apparent magnitude  (V)4.72 [2]
(4.92 + 7.51) [3]
Characteristics
Evolutionary stage horizontal branch [4]
Spectral type K2III [5]
U−B color index +1.11 [6]
B−V color index +1.15 [6]
Astrometry
Radial velocity (Rv)−0.16 [7]  km/s
Proper motion (μ)RA: −31.645 [1]   mas/yr
Dec.: −57.144 [1]   mas/yr
Parallax (π)16.1517 ± 0.2358  mas [1]
Distance 202 ± 3  ly
(61.9 ± 0.9  pc)
Absolute magnitude  (MV)0.72 [2]
Orbit [8]
Period (P)140.76±0.23 yr
Semi-major axis (a)0.959±0.008″
Eccentricity (e)0.866±0.003
Inclination (i)65.1±0.0°
Longitude of the node (Ω)220.5±0.0°
Periastron epoch (T)1890.53±0.36  B
Argument of periastron (ω)
(secondary)		287.5±0.0°
Details
41 Oph A
Mass 1.46 [9]   M☉
Radius 11.80+0.27
−0.39 [1]   R☉
Luminosity 60.3±1.0 [1]   L☉
Surface gravity (log g)2.42 [10]   cgs
Temperature 4,509±65 [9]   K
Metallicity [Fe/H]+0.06 [2]   dex
Rotational velocity (v sin i)2.6 [7]  km/s
Age 3.73 [9]   Gyr
Other designations
41 Oph, BD−00°3255, GC  23320, HD  156266, HIP  84514, HR  6415, SAO  141586, CCDM J17166-0027AB, WDS J17166-0027 [11]
Database references
SIMBAD data

41 Ophiuchi is a binary star [8] system in the zodiac constellation of Ophiuchus, and is positioned less than half a degree to the south of the celestial equator. It is visible to the naked eye as a faint, orange-hued point of light with a combined apparent visual magnitude of 4.72. [2] The distance to this system is approximately 202  light years based on parallax. [12]

This is a visual binary with an orbital period of 141 years and an eccentricity of 0.866. [8] The magnitude 4.92 [3] primary, designated component A, is an aging K-type giant star with a stellar classification of K2III. [5] It is a red clump giant, [4] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. The star is 3.7 [9]  billion years old with 1.46 [9] times the mass of the Sun and has expanded to nearly 12 [1] times the Sun's radius. It is radiating 60 [1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,509 K. [9]

The secondary companion, component B, has a visual magnitude of 7.51 and an angular separation of 0.70″ from the primary along a position angle of 22°, as of 2017. [3]

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References

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  5. 1 2 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.
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  7. 1 2 Massarotti, Alessandro; et al. (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 .
  8. 1 2 3 Tokovinin, Andrei; et al. (August 2015). "Speckle Interferometry at SOAR in 2014". The Astronomical Journal. 150 (2): 17. arXiv: 1506.05718 . Bibcode:2015AJ....150...50T. doi:10.1088/0004-6256/150/2/50. S2CID   30737411. 50.
  9. 1 2 3 4 5 6 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.
  10. ↑ 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
  11. ↑ "41 Oph". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-21.
  12. ↑ 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
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