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Theta Boötis, Latinized from θ Boötis, is a star in the northern constellation of Boötes the herdsman, forming a corner of the upraised left hand of this asterism.[13] It has the traditional name Asellus Primus (/əˈsɛləs ˈpraɪməs/; Latin for "first donkey colt")[13] and the Flamsteed designation 23 Boötis. Faintly visible to the naked eye, this star has a yellow-white hue with an apparent visual magnitude of 4.05.[2] It is located at a distance of 47 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −10.6 km/s.[5]

Theta Boötis

θ Boötis in optical light
Location of θ Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 25m 11.79703s[1]
Declination +51° 51′ 02.6769″[1]
Apparent magnitude (V) 4.05[2] + 13.23[3]
Characteristics
Spectral type F7 V[2] + M2.5V[3]
U−B color index −0.02[4]
B−V color index +0.50[2]
Astrometry
Radial velocity (Rv)−10.627±0.0065[5] km/s
Proper motion (μ) RA: −235.40[1] mas/yr
Dec.: −399.07[1] mas/yr
Parallax (π)68.82 ± 0.14 mas[1]
Distance47.39 ± 0.10 ly
(14.53 ± 0.03 pc)
Absolute magnitude (MV)3.25[6]
Details
A
Mass1.41 M☉[7]
1.24[8] M☉
Radius1.733±0.011[9] R☉
Luminosity4.131±0.096[9] L☉
Surface gravity (log g)4.07[8] cgs
Temperature6,294±40[8] K
Metallicity [Fe/H]0.03[8] dex
Rotational velocity (v sin i)29.2[10] km/s
Age3.1 Gyr[11]
3.83[8] Gyr
B
Mass0.21[7] M☉
Other designations
Asellus Primus, θ Boo, 23 Boötis, NSV 6669, BD+52° 1804, FK5 531, GJ 549, HD 126660, HIP 70497, HR 5404, SAO 29137, WDS J14252+5151A, LTT 14245[12]
Database references
SIMBADdata
ARICNSdata

Properties


The stellar classification of Theta Boötis is F7 V,[2] matching an F-type main-sequence star. It is a solar-type star that may be near the end of its main sequence lifetime based on a high luminosity for a star of its type.[11] Theta Boötis is a suspected variable star[14] and a source of X-ray emission.[15] There is evidence for low amplitude radial velocity variation of about 5 km/s.[11] The star has a greater mass and a larger radius than the Sun. It is about 3–4 billion years old and is spinning with a projected rotational velocity of 29 km/s.[10] The star is radiating 4.1[9] times the luminosity of the Sun from its photosphere at an effective temperature of 6,294 K.[8]

There is a nearby 11th magnitude optical companion star about 70 arcseconds away. This is a class M2.5 red dwarf that is separated by a minimum of 1,000 AUs. It is uncertain whether they are gravitationally bound, but they do have a common motion through space and so the two stars probably share a common origin.[16][3]


Nomenclature


θ Boötis, along with the other Aselli (ι Boo and κ Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā‘), "the Whelps of the Hyenas".[13]

In Chinese, 天枪 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of θ Boötis, κ2 Boötis and ι Boötis.[17] Consequently, the Chinese name for θ Boötis itself is 天枪三 (Tiān Qiāng sān, English: the Third Star of Celestial Spear.)[18]


References


  1. 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
  2. Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M
  3. Lépine, Sébastien; Bongiorno, Bethany (March 2007), "New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems", The Astronomical Journal, 133 (3): 889–905, arXiv:astro-ph/0610605, Bibcode:2007AJ....133..889L, doi:10.1086/510333, S2CID 16800796.
  4. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
  5. Soubiran, C.; et al. (2018), "Gaia Data Release 2. The catalogue of radial velocity standard stars", Astronomy and Astrophysics, 616: A7, arXiv:1804.09370, Bibcode:2018A&A...616A...7S, doi:10.1051/0004-6361/201832795, S2CID 52952408.
  6. Holmberg, J.; et al. (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, S2CID 118577511.
  7. Tokovinin, A.; Kiyaeva, O. (February 21, 2016), "Eccentricity distribution of wide binaries", Monthly Notices of the Royal Astronomical Society, 456 (2): 2070–2079, arXiv:1512.00278, Bibcode:2016MNRAS.456.2070T, doi:10.1093/mnras/stv2825.
  8. Luck, R. Earle (January 2017), "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants", The Astronomical Journal, 153 (1): 19, arXiv:1611.02897, Bibcode:2017AJ....153...21L, doi:10.3847/1538-3881/153/1/21, S2CID 119511744, 21.
  9. 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, S2CID 18993744.. See Table 10.
  10. Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode:2009A&A...493.1099S, doi:10.1051/0004-6361:200810377
  11. Rachford, Brian L.; Foight, Dillon R. (June 2009), "Chromospheric Variability in Early F-Type Stars", The Astrophysical Journal, 698 (1): 786–802, arXiv:0904.1620, Bibcode:2009ApJ...698..786R, doi:10.1088/0004-637X/698/1/786, S2CID 693296.
  12. "tet Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 January 2018.
  13. Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p. 105, ISBN 0-486-21079-0, retrieved 2010-12-12.
  14. Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  15. Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv:0910.3229, Bibcode:2009ApJS..184..138H, doi:10.1088/0067-0049/184/1/138, S2CID 119267456.
  16. Kaler, James, "Asellus Primus", Stars, University of Illinois, retrieved 2016-01-07.
  17. (in 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.
  18. (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-11 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.



На других языках

[de] Theta Bootis

θ Bootis (Theta Bootis, Aussprache: "Bo-otes") ist ein Hauptreihenstern im Sternbild Bärenhüter. Er trägt den Eigennamen Asellus Primus (lat. erstes Eselchen). Theta Bootis hat eine scheinbare Helligkeit von 4,1 mag und gehört der Spektralklasse F7 an. Seine Entfernung beträgt ca. 47 Lichtjahre.
- [en] Theta Boötis

[es] Asellus Primus

Asellus Primus (θ Bootis / θ Boo / 23 Bootis)[1] es una estrella de la constelación de El Boyero con magnitud aparente +4,04. El nombre Asellus significa «asno» en latín, siendo tres las estrellas que llevan este nombre en la constelación: de este a oeste son Asellus Primus —la primera—, Asellus Secundus (ι Bootis) —la segunda— y Asellus Tertius (κ Bootis), la tercera y última. Asellus Primus se encuentra a 48 años luz de distancia del Sistema Solar.

[ru] Тета Волопаса

Тета Волопаса (θ Волопаса, Theta Boötis, сокращ. Theta Boo, θ Boo) — звезда в северном созвездии Волопаса. Звезда имеет видимую звёздную величину 4.05m[2], и, согласно шкале Бортля, видна невооружённым глазом даже на городском небе (англ. City sky).


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