Beta Arae

From Wikipedia, the free encyclopedia
β Arae
Location of β Arae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Ara
Right ascension 17h 25m 17.989s[1]
Declination −55° 31′ 47.574″[1]
Apparent magnitude (V) 2.84[2]
Characteristics
Spectral type K3 Ib-II[3]
U−B color index +1.56[4]
B−V color index +1.46[4]
Astrometry
Radial velocity (Rv)−0.30±0.20[3] km/s
Proper motion (μ) RA: −8.51[5] mas/yr
Dec.: −25.24[5] mas/yr
Parallax (π)4.5601 ± 0.2077 mas[1]
Distance713+39
−34 ly
(218.8+12
−10.4 pc)[6]
Absolute magnitude (MV)−3.494[7]
Details[8]
Mass5.89±0.07 or 7.89±0.4 M☉
Radius141.4±6.6 R☉
Luminosity5774±535 L☉
Surface gravity (log g)0.97±0.06 cgs
Temperature4232±17 K
Metallicity [Fe/H]0.5±0.1 dex
Rotational velocity (v sin i)5.4±1.0[3] km/s
Age50.1±4.4[9] Myr
Other designations
CPD−55°8100, FK5 645, HD 157244, HIP 85258, HR 6461, SAO 244725[10]
Database references
SIMBADdata

Beta Arae (β Ara, β Arae), is the brightest star in the constellation of Ara. It is a very luminous, relatively young, giant or supergiant star with an apparent magnitude of 2.84 and an absolute magnitude of -3.494.[2][7] It is located about 713 light-years from Earth.[6] At this distance, its apparent magnitude is diminished by 0.193 magnitudes due to interstellar extinction between Earth and the star.[8]

Characteristics[edit]

The spectrum of this star matches a stellar classification of K3 Ib-IIa,[3] with the luminosity class notation 'Ib-IIa' indicating that the star lies part way between a higher luminosity bright giant (IIa) and a lower luminosity supergiant (Ib). It has an age estimated at 50 million years, having spent much of its life as a B-type star.[11] Currently, it has expanded to 141 times the Sun's size and emitts 5,800 times its luminosity.[8] Beta Arae is radiating energy from its outer envelope at an effective temperature of 4,200 K, which causes it to take on the orange hue of a K-type star.[12] This enlarged star appears to be rotating slowly with a projected rotational velocity of about 5 km/s.[3] The abundance of elements other than hydrogen and helium, its metallicity, is more than three times that of the Sun.[3][a]

Nomenclature[edit]

Beta Arae is the star's Bayer designation. Other designations include HD 157244 (from the [[Henry Draper Catalogue), HIP 85258 (from the Hipparcos catalogue) and HR 6461 (from the Bright Star Catalogue).[10]

Rarely, this star is called Vasat-ül-cemre a Turkisation of Arabic وسط الجمر (wasaṭ al-jamar), meaning "middle of the embers."[13] The constellation is named in Arabic المجمرة (al-mijmarah), meaning brazier/incense-burner.[14] In Chinese, 杵 (Chǔ), meaning Pestle, refers to an asterism of β, σ and α Arae.[15] The Chinese name for β Arae is 杵三 (Chǔ sān, English: the Third Star of Pestle.)[16]

Notes[edit]

  1. ^ The abundance is estimated by taking [Fe/H] to the power of ten:
              10[Fe/H] = 10+0.5 = 3.1

References[edit]

  1. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Wielen, R.; et al. (1999). "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions". Veröff. Astron. Rechen-Inst. Heidelb. 35 (35). Astronomisches Rechen-Institut Heidelberg: 1. Bibcode:1999VeARI..35....1W.
  3. ^ a b c d e f De Medeiros, J. R.; et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. arXiv:1312.3474. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
  4. ^ a b Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  5. ^ a b van Leeuwen, F. (November 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.
  6. ^ a b Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
  7. ^ a b Cassatella, A.; Altamore, A.; Badiali, M.; Cardini, D. (2001). "On the Wilson-Bappu relationship in the Mg II k line". Astronomy and Astrophysics. 374 (3): 1085–1091. arXiv:astro-ph/0106070. Bibcode:2001A&A...374.1085C. doi:10.1051/0004-6361:20010816. S2CID 16286422.
  8. ^ a b c Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C.; Vitali, S.; Worley, C.; de Brito Silva, D. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics. 682: A145. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. Beta Arae's database entry at VizieR.
  9. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  10. ^ a b "bet Ara -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-15.
  11. ^ "Beta Arae". stars.astro.illinois.edu. Retrieved 2024-05-22.
  12. ^ "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2012-03-18. Retrieved 2012-01-16.
  13. ^ "YILDIZ ADLARI SÖZLÜĞÜ" [Glossary of Star Names - V]. Mustafa Pultar (in Turkish). Retrieved 2020-03-04.
  14. ^ "Ara". Google. Archived from the original on 2020-07-26. Retrieved 2020-03-04.
  15. ^ 陳久金 (2005). 中國星座神話 [Chinese horoscope myth] (in Chinese). Wunan Book Publishing Co. ISBN 978-986-7332-25-7.
  16. ^ "天文教育資訊網". AEEA (Activities of Exhibition and Education in Astronomy) (in Chinese). 2006-07-01. Retrieved 2020-03-04.

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=Beta_Arae&oldid=1225274168"