45 Herculis

Last updated
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)−16.1±2 [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]
Details
Mass 2.85±0.11 [10]   M☉
Radius 4.86 [11]   R☉
Luminosity 120.06 [9]   L☉
Surface gravity (log g)3.00 [12]   cgs
Temperature 9,333 [12]   K
Metallicity [Fe/H]0.10 [12]   dex
Rotational velocity (v sin i)44 [13]  km/s
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 solitary [15] 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. [8]

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 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]

Related Research Articles

7 Andromedae is a single, yellow-white hued star in the northern constellation of Andromeda. 7 Andromedae is the Flamsteed designation. It is visible to the naked eye with an apparent visual magnitude of 4.52, and is located 79.6 light years from Earth, based on an annual parallax shift of 41 mas. The star is moving further from the Sun with a heliocentric radial velocity of 12 km/s.

55 Arietis is a single star in the northern zodiac constellation of Aries. 55 Arietis is the Flamsteed designation. It is faintly visible to the naked eye as a dim, blue-white hued point of light with an apparent visual magnitude of 5.72. Based upon an annual parallax shift of 3.6 mas, it is approximately 910 light-years distant from Earth, give or take a 30 light-year margin of error. Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster. It may be a runaway star, having a peculiar velocity of 25.9+3.9
−6.1 km/s relative to its neighbors.

<span class="mw-page-title-main">56 Arietis</span> Star in the constellation Aries

56 Arietis is a single, variable star in the northern zodiac constellation of Aries. It has the variable star designation SX Arietis, while 56 Arietis is the Flamsteed designation. This object is visible to the naked eye as a faint, blue-white hued point of light with a baseline apparent visual magnitude of 5.79. The estimated distance to this star is approximately 415 light-years, based on parallax, and it is drifting further away with a radial velocity of +18 km/s.

53 Arietis is a variable star in the northern constellation of Aries. 53 Arietis is the Flamsteed designation; it also bears the variable star designation UW Arietis. It is a B-type main sequence star with a stellar classification of B1.5 V and mean apparent magnitude of 6.10, which is near the lower limit for naked eye visibility. Based upon an annual parallax shift of 3.2 mas, the estimated distance to this star is roughly 1,020 light-years.

<span class="mw-page-title-main">Omega Herculis</span> Variable star in the constellation Hercules

Omega Herculis is a binary star system in the northern constellation of Hercules. Based upon an annual parallax shift of 13.04 mas as seen from Earth, it is located around 250 light-years from the Sun. It is faintly visible to the naked eye, having a combined apparent visual magnitude of 4.58. The system is a candidate for membership in the Ursa Major Moving Group, although this remains uncertain.

<span class="mw-page-title-main">31 Camelopardalis</span> Binary star system in the constellation Camelopardalis

31 Camelopardalis is a binary star system in the northern circumpolar constellation of Camelopardalis. It is visible to the naked eye as a dim point of light with a peak apparent visual magnitude of +5.12. Parallax measurements provide a distance estimate of approximately 460 light years away from the Sun, and the system is drifting closer to the Earth with a radial velocity of −3 km/s.

72 Herculis is a single star in the northern constellation of Hercules. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 72nd star in Flamsteed's list of stars in Hercules. This star is faintly visible to the naked eye with an apparent visual magnitude of 5.4. Parallax measurements show this star to be located at a distance of about 47 light years from the Sun. It is drifting closer with a radial velocity of −78.6 km/s, and is predicted to come to within 32.1 light-years in around 98,000 years.

<span class="mw-page-title-main">Pi Herculis</span> Star in the constellation Hercules

Pi Herculis is a third-magnitude star in the constellation Hercules. As one of the four stars in the Keystone asterism, it is one of the constellation's more easily recognized. It has an apparent visual magnitude of +3.2, which is visible to the naked eye and makes it one of its brighter members. The Gaia spacecraft mission estimated its distance at roughly 112 parsecs from Earth, or about 367 light years away. The overall reduction in the star's visual magnitude due to extinction from the intervening cosmic dust is 0.11.

Tau<sup>9</sup> Eridani Binary star in the constellation Eridanus

Tau9 Eridani is a binary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.63. The distance to this system can be estimated using the parallax method, which yields a value of roughly 327 light years.

<span class="mw-page-title-main">1 Geminorum</span> Triple star system in the constellation Gemini

1 Geminorum is a star in the constellation Gemini. Its apparent magnitude is 4.15.

<span class="mw-page-title-main">Phi Herculis</span> Star in the constellation Hercules

Phi Herculis is a binary star system in the northern constellation of Hercules. Based upon an annual parallax shift of 15.99 mas as seen from Earth, it is located around 204 light years from the Sun. With a combined apparent visual magnitude of 4.24, it is bright enough to be seen with the naked eye.

Chi Herculis, Latinized from χ Herculis, is a Sun-like star in the northern constellation of Hercules. Based upon an annual parallax shift of 63.16 mas as seen from Earth, it is located 51.6 light years from the Sun. The star is faintly visible to the naked eye with an apparent visual magnitude of 4.59. It has a relatively high proper motion, showing a transverse movement of 0.769 arc seconds per year and is drifting closer to the Sun with a radial velocity of −56 km/s.

g Herculis Star in the constellation Hercules

g Herculis is a binary star system in the northern constellation of Hercules. It has the Flamsteed designation 30 Herculis, while g Herculis is the Bayer designation. This system is visible to the naked eye as a faint, red-hued point of light. Based upon a measured parallax of 9.2 mas, it is located around 354 light years away from the Sun. The system is moving further from the Earth with a heliocentric radial velocity of 1.5 km/s.

29 Herculis is a single star located around 351 light years away from the Sun in the northern constellation of Hercules, a few degrees away from Omega Herculis. It has the Bayer designation h Herculis, while 29 Herculis is the Flamsteed designation. This star is visible to the naked eye as a faint, orange-hued point of light with an apparent visual magnitude of 4.84. It is moving further from the Earth with a heliocentric radial velocity of +3 km/s. The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.195 arc seconds per annum.

60 Herculis is a single star located 134 light years away from the Sun in the northern constellation of Hercules, and is positioned just seven degrees away from Rasalgethi. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.871. This star is moving closer to the Earth with a heliocentric radial velocity of −4 km/s.

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. Based on its parallax, it is estimated to lie 383 light-years away from the Sun. The star is moving closer to the Earth with a heliocentric radial velocity of -35 km/s.

90 Tauri is a star in the zodiac constellation of Taurus, located 144 light-years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.27. 90 Tauri is a member of the Hyades cluster and is listed as a double star.

<span class="mw-page-title-main">41 Tauri</span> Star in the constellation Taurus

41 Tauri is a single-lined spectroscopic binary system in the zodiacal constellation of Taurus; 41 Tauri is its Flamsteed designation. The star has a visual magnitude of 5.19, making it visible to the naked eye from brighter suburban skies. Parallax measurements put it at a distance of roughly 404 light years from the Sun.

<span class="mw-page-title-main">9 Ceti</span> Star in the constellation Cetus

9 Ceti is a star in the equatorial constellation of Cetus. It has the variable star designation BE Ceti, while 9 Ceti is the Flamsteed designation. It has an apparent visual magnitude of 6.4, which is below the limit that can be seen with the naked eye by a typical observer. Based upon parallax measurements, this star is 69.6 light years away from the Sun.

<span class="mw-page-title-main">1 Lyncis</span> Red giant star in the constellation Lynx

1 Lyncis is a single star in the northern constellation of Lynx. It is also known by its variable star designation of UW Lyncis; 1 Lyncis is the Flamsteed designation. This object is visible to the naked eye as a faint, reddish-hued star with an apparent visual magnitude of 4.95. It is moving further from the Earth with a heliocentric radial velocity of 12 km/s.

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 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
  9. 1 2 3 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 4 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. ↑ 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.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.