Beta Virginis

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Beta Virginis
Diagram showing star positions and boundaries of the Virgo constellation and its surroundings
Cercle rouge 100%.svg

Location of β Virginis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 11h 50m 41.71824s[1]
Declination +1° 45′ 52.9910″[1]
Apparent magnitude (V) 3.604[2]
Characteristics
Spectral type F9 V[3]
U−B color index +0.090[2]
B−V color index +0.553[2]
Astrometry
Radial velocity (Rv) +4.1[4] km/s
Proper motion (μ) RA: +740.23[1] mas/yr
Dec.: -270.43[1] mas/yr
Parallax (π) 91.50 ± 0.22[1] mas
Distance 35.65 ± 0.09 ly
(10.93 ± 0.03 pc)
Absolute magnitude (MV) 3.41[4]
Details
Mass 1.25[5] M
Radius 1.681 ± 0.008[6] R
Luminosity 3.572 ± 0.052[6] L
Surface gravity (log g) 4.25[7] cgs
Temperature 6,132 ± 26[6] K
Metallicity [Fe/H] 0.20[7] dex
Rotational velocity (v sin i) 4.3[5] km/s
Age 2.9 ± 0.3[4] Gyr
Other designations
Zavijava, Zavijah, Alaraph, Minelauva, 5 Virginis, BD +02°2489, FK5 445, Gl 449, HD 102870, HIP 57757, HR 4540, SAO 119076.[8]
Database references
SIMBAD data
ARICNS data

Beta Virginis (β Vir, β Virginis) is a star in the constellation Virgo. It has the traditional names Zavijava (also Zavijah) and Alaraph.[9] Despite being the beta star of the constellation Virgo it is only the fifth star in order of brightness.

Physically, Beta Virginis is larger and more massive than the Sun, and is comparatively metal-rich (that is, it has a higher preponderance of elements heavier than helium).[7]

Since it is close to the ecliptic, it can be occulted by the Moon and (very rarely) by planets. The next planetary occultation of Zavijava will take place on 11 August 2069, by Venus.

This was the star Einstein used during the solar eclipse of September 21, 1922, to determine the speed of light in space,[dubious ] as it was close to the Sun.

Etymology[edit]

The medieval name Zavijava (Zavijah, Zavyava, Zawijah) is from the Arabic زاوية العواء zāwiyat al-cawwa’ "Corner of the barking (dog)". Another name was Alaraph.

In Chinese, 太微右垣 (Tài Wēi Yòu Yuán), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of β Virginis, σ Leonis, ι Leonis, θ Leonis and δ Leonis.[10] Consequently, β Virginis itself is known as 太微右垣一 (Tài Wēi Zuǒ Yuán yī, English: the First Star of Right Wall of Supreme Palace Enclosure.),[11] representing 右執法 (Yòuzhífǎ), meaning The The Right Law Administrator.[12] 右執法 (Yòuzhífǎ), spelled Yew Chi Fa by R.H. Allen, means "the Right-hand Maintainer of Law" [13]

Hunt for substellar objects[edit]

According to Nelson & Angel (1998),[14] Beta Virginis could host two or three jovian planets in wide orbits. The authors have set an upper limit of 1.9, 5 and 23 Jupiter masses for the putative planets with orbital periods of 15, 25 and 50 years respectively. Also Campbell et al. 1988[15] inferred the existence of planetary objects or even brown dwarfs around Beta Virginis. However more recent studies have not confirmed the existence of any substellar companion around Beta Virginis yet. McDonald Observatory team has set limits to the presence of one or more planets[16] with masses between 0.16 and 4.2 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.

References[edit]

  1. ^ a b c d e 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 
  2. ^ a b c Gutierrez-Moreno, Adelina; Moreno, Hugo (June 1968), "A photometric investigation of the Scorpio-Centaurus association", Astrophysical Journal Supplement 15: 459, Bibcode:1968ApJS...15..459G, doi:10.1086/190168 
  3. ^ Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics 11 (1): 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333 
  4. ^ a b c Holmberg, J.; Nordström, B.; Andersen, J. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, arXiv:0811.3982, Bibcode:2009A&A...501..941H, doi:10.1051/0004-6361/200811191 
  5. ^ a b Carrier, F.; Eggenberger, P.; D'Alessandro, A.; Weber, L. (2005). "Solar-like oscillations in the F9 V β Virginis". New Astronomy 10 (4): 315–323. arXiv:astro-ph/0502014. Bibcode:2005NewA...10..315C. doi:10.1016/j.newast.2004.11.003. Retrieved 2007-06-05. 
  6. ^ a b c Boyajian, Tabetha S. et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101 . See Table 10.
  7. ^ a b c Gehren, T. (1978). "On the chemical composition and age of Beta VIR". Astronomy and Astrophysics 65 (3): 427–433. Bibcode:1978A&A....65..427G. 
  8. ^ "LHS 2465 -- High proper-motion Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-03-20 
  9. ^ Atlas of the Heavens, part II, catalogue, Antonín Bečvář
  10. ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  11. ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
  12. ^ (Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name, Hong Kong Space Museum. Accessed on line November 23, 2010.
  13. ^ [1]
  14. ^ The Range of Masses and Periods Explored by Radial Velocity Searches for Planetary Companions
  15. ^ A search for substellar companions to southern solar-type stars
  16. ^ Detection Limits from the McDonald Observatory Planet Search Program

External links[edit]

  • Kaler, Jim (2007). "Zavijava". Stars: Portraits of Stars and their Constellations. Retrieved 2007-06-06. 
  • "Zavijah". Alcyone. Retrieved 2007-06-06.