106 Herculis

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106 Herculis
106HerLightCurve.png
A light curve for 106 Herculis, plotted from TESS data [1]
Observation data
Epoch J2000        Equinox J2000
Constellation Hercules
Right ascension 18h 20m 17.91482s [2]
Declination +21° 57 40.6622 [2]
Apparent magnitude  (V)4.96 [3]
Characteristics
Spectral type M0 III [4]
U−B color index +1.98 [5]
B−V color index +1.58 [5]
Variable type suspected SR [6] [7]
Astrometry
Radial velocity (Rv)−35.20±0.29 [8]  km/s
Proper motion (μ)RA: +18.105 [2]   mas/yr
Dec.: -59.631 [2]   mas/yr
Parallax (π)8.5067 ± 0.1739  mas [2]
Distance 383 ± 8  ly
(118 ± 2  pc)
Absolute magnitude  (MV)−0.664 [8]
Details
Radius 44.32+2.70
−5.89
[2]   R
Luminosity 414.1±9.7 [2]   L
Surface gravity (log g)1.56±0.09 [4]   cgs
Temperature 3,789±6 [4]   K
Metallicity [Fe/H]0.00±0.03 [4]   dex
Rotational velocity (v sin i)5.0±1.0 [9]  km/s
Other designations
106 Her, NSV  24405, BD+21°3390, HD  168720, HIP  89861, HR  6868, SAO  85941 [10]
Database references
SIMBAD data

106 Herculis is a variable star in the northern constellation Hercules. It is visible to the naked eye as a faint, red-hued point of light with a baseline apparent visual magnitude of 4.96. [3] Based on its parallax, it is estimated to lie 383 light-years (117 parsecs) away from the Sun. [4] The star is moving closer to the Earth with a heliocentric radial velocity of -35 km/s. [8]

Eggleton and Tokovinin (2008) listed this as a suspected binary star system consisting of two roughly equal components. [11] It appears as an ageing red giant with a stellar classification of M0III. This is a suspected semiregular variable star with a very small amplitude and a period of 40 days or more. [7] Having exhausted the supply of hydrogen at its core, it has expanded to 44 [2] times the Sun's radius. It is radiating around 414 [2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of about 3,789 K. [4]

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<span class="mw-page-title-main">17 Persei</span> Star in the constellation Perseus

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References

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  7. 1 2 Percy, John R. (1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific. 105: 1422. Bibcode:1993PASP..105.1422P. doi: 10.1086/133324 .
  8. 1 2 3 Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (2008). "Vertical distribution of Galactic disk stars". Astronomy & Astrophysics. 480 (1): 91–101. arXiv: 0712.1370 . Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788. S2CID   16602121.
  9. Zamanov, R. K.; et al. (October 2008). "Rotational velocities of the giants in symbiotic stars - III. Evidence of fast rotation in S-type symbiotics". Monthly Notices of the Royal Astronomical Society. 390 (1): 377–382. arXiv: 0807.3817 . Bibcode:2008MNRAS.390..377Z. doi: 10.1111/j.1365-2966.2008.13751.x . S2CID   118697261.
  10. "106 Her". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-17.
  11. 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.