45 Herculis

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45 Herculis
V776HerLightCurve.png
An ultraviolet band light curve for V776 Herculis, adapted from Burke and Barr (1981) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Hercules
Right ascension 16h 47m 46.41942s [2]
Declination +05° 14′ 48.2789″ [2]
Apparent magnitude  (V)5.22 [3]
Characteristics
Spectral type A1 Vp Si [4] or B9p Cr [5]
U−B color index +0.005 [6]
B−V color index −0.025 [6]
Variable type α2 CVn [7]
Astrometry
Radial velocity (Rv)−13.13±0.09 [8]  km/s
Proper motion (μ)RA: −18.802 [2]   mas/yr
Dec.: −38.735 [2]   mas/yr
Parallax (π)8.1955 ± 0.2169  mas [2]
Distance 400 ± 10  ly
(122 ± 3  pc)
Absolute magnitude  (MV)−0.18 [9]
Orbit [8]
Period (P)99.51 ± 0.10 d
Eccentricity (e)0.445 ± 0.020
Argument of periastron (ω)
(primary)		167.1 ± 4.2°
Semi-amplitude (K1)
(primary)		4.75 ± 0.12 km/s
Details
Mass 2.85±0.11 [10]   M☉
Radius 4.3 [11]   R☉
Luminosity 129.7 [8]   L☉
Surface gravity (log g)3.55 [12]   cgs
Temperature 9,400 [8]   K
Metallicity [Fe/H]0.10 [12]   dex
Rotation 4.116476 ± 0.000022
Rotational velocity (v sin i)35.5 [13]  km/s
Age 351–469 [8]   Myr
Other designations
l Her, 45 Her, V776 Herculis, BD+05°3272, HD  151525, HIP  82216, HR  6234, SAO  121865, WDS 16478+0515 [14]
Database references
SIMBAD data

45 Herculis is a binary variable star in the northern constellation Hercules. It has the Bayer designation l Herculis and the variable star designation V776 Herculis. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 45th star in Flamsteed list of stars in the constellation Hercules, and is visible to the naked eye with a baseline apparent visual magnitude of 5.22. [3] Parallax measurements show this star to be about 400  light-years away from the Solar System. [2] It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s. [15]

Cowley et at. (1969) assigned this object a classification of B9p Cr, [5] while Abt and Morrell (1995) found a class of A1 Vp Si. [4] Both indicate this is a late B- or early A-type chemically peculiar, or Ap star, with abundance anomalies in chromium or silicon. It is classified as a magnetic Ap star, although its magnetic field is unusually weak for a star of this class. [8] It is an Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.21 down to 5.27. [7] The star has 2.9 [10] times the mass of the Sun and 4.9 [11] times the Sun's radius. It is radiating 120 [9] times the Sun's luminosity from its photosphere at an effective temperature of 9,333 K. [12]

Although 45 Herculis was long thought to be a solitary star, [16] a 2023 study confirmed that 45 Herculis is a single-lined spectroscopic binary. The pair of stars orbit each other every 99.51 days on a moderately eccentric orbit. The secondary star is likely a low-mass star. [8]

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References

  1. ↑ Burke, E. W. Jr.; Barr, T. H. (June 1981). "Photometric UBV period study of eight AP stars". Publications of the Astronomy Society of the Pacific. 93: 344–350. Bibcode:1981PASP...93..344B. doi: 10.1086/130836 . S2CID   122946991.
  2. 1 2 3 4 5 6 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.
  3. 1 2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  4. 1 2 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 .
  5. 1 2 Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
  6. 1 2 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  7. 1 2 Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID   125853869.
  8. 1 2 3 4 5 6 7 Kochukhov, O.; Gürsoytrak Mutlay, H.; Amarsi, A. M.; Petit, P.; Mutlay, I.; Gürol, B. (2023). "Surface structure of 45 Hercules: An otherwise unremarkable Ap star with a surprisingly weak magnetic field". Monthly Notices of the Royal Astronomical Society. 521 (3): 3480–3499. arXiv: 2303.03862 . Bibcode:2023MNRAS.521.3480K. doi: 10.1093/mnras/stad720 .
  9. 1 2 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.
  10. 1 2 Netopil, Martin; Paunzen, Ernst; Huemmerich, Stefan; Bernhard, Klaus (July 2017). "An Investigation of the Rotational Properties of Magnetic Chemically Peculiar Stars". Monthly Notices of the Royal Astronomical Society. 468 (3): 2745–2756. arXiv: 1703.05218 . Bibcode:2017MNRAS.468.2745N. doi: 10.1093/mnras/stx674 . S2CID   119215348.
  11. 1 2 Shulyak, D.; et al. (2014). "Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities". Monthly Notices of the Royal Astronomical Society. 443 (2): 1629. arXiv: 1406.6093 . Bibcode:2014MNRAS.443.1629S. doi: 10.1093/mnras/stu1259 . S2CID   96452769.
  12. 1 2 3 Wolff, Sidney Carne (October 1967). "A Spectroscopic and Photometric Study of the AP Stars". Astrophysical Journal Supplement. 15: 21. Bibcode:1967ApJS...15...21W. doi: 10.1086/190162 .
  13. ↑ Royer, F.; et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics. 393: 897–911. arXiv: astro-ph/0205255 . Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID   14070763.
  14. ↑ "45 Her". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-06-14.
  15. ↑ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  16. ↑ 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.
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