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Iota Boötis

From Wikipedia, the free encyclopedia
Binary star system in the northern constellation of Boötes
ι Boötis
Location of ι Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
ConstellationBoötes
Right ascension14h 16m 09.92976s[1]
Declination+51° 22′ 02.0287″[1]
Apparent magnitude (V)4.75[2](4.73 – 4.78[3])
Characteristics
Spectral typeA7 V[4]
U−Bcolor index+0.06[5]
B−Vcolor index+0.20[5]
R−Icolor index+0.09[5]
Variable typeDelta Scuti variable[3]
Astrometry
Radial velocity (Rv)−18.7[6] km/s
Proper motion (μ)RA: −149.277[1]mas/yr
Dec.: +89.135[1]mas/yr
Parallax (π)33.8856±0.0820 mas[1]
Distance96.3 ± 0.2 ly
(29.51 ± 0.07 pc)
Absolute magnitude (MV)+2.38[7]
Details
Mass1.81[4] M☉
Radius1.7[1] R☉
Luminosity8.8[1] L☉
Surface gravity (log g)4.14[1] cgs
Temperature7,764[1] K
Metallicity [Fe/H]+0.19[8] dex
Rotational velocity (v sin i)144[9] km/s
Age785[1] Myr
Other designations
Asellus Secondus,[10]21 Boötis,BD+52°1784,FK5 528,HD 125161,HIP 69713,HR 5350,SAO 29071,Wo 9474,WDS J14162+5122
Database references
SIMBADdata
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Iota Boötis (ι Boo, ι Boötis) is a member of abinary star system in theconstellationBoötes, approximately 96light-years from Earth. It has the traditional nameAsellus Secundus/əˈsɛləssɪˈkʌndəs/ (Latin for "seconddonkey colt") and theFlamsteed designation21 Boötis. The companion isHD 234121, a K0main sequence star.

Components

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ι Boötis and its nearby companion HD 234121 (the faint component C is also visible to the south)
Avisual bandlight curve for Iota Boötis, adapted from Kiss (1995)[11]

Iota Boötis has a companion at anangular distance of 38.6arcseconds, easily separated with binoculars.

The primary component is a whiteA-typemain-sequence dwarf with a meanapparent magnitude of +4.75. It is classified as aDelta Scuti-typevariable star and its brightness varies from magnitude +4.73 to +4.78 with a stable period of 38 minutes.[7]

The companion, HD 234121, is a magnitude 7.3 main-sequence star belonging tospectral class K0V.[12][13] It is separated from ι Boo by1,100 AU.[4] HD 234121 has a mass of 0.8 M☉, a luminosity of 0.4 L☉, a temperature of5,090 K, and a radius of 0.8 R☉.[14]

TheWashington Double Star Catalog lists a third component, a 14th-magnitude star at 90 arcseconds,[13] but it is an unrelated background star.[15]

Nomenclature

[edit]

This star, along with the otherAselli (θ Boo andκ Boo) andλ Boo, wereAulād al Dhiʼbah (أولاد الضّباع -awlād al-ḍibā‘), "the Whelps of the Hyenas".[the transcription does not match the Arabic][16]

InChinese,天槍 (Tiān Qiāng), meaningCelestial Spear, refers to anasterism consisting of ι Boötis,κ2 Boötis andθ Boötis.[17] Consequently, theChinese name for ι Boötis itself is天槍二 (Tiān Qiāng èr, English:the Second Star of Celestial Spear).[18]

References

[edit]
  1. ^abcdefghijVallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties".Astronomy and Astrophysics.674: A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this source atVizieR.
  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. ^abSamus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S.1.Bibcode:2009yCat....102025S.
  4. ^abcDe Rosa, R. J.; Patience, J.; Wilson, P. A.; Schneider, A.; Wiktorowicz, S. J.; Vigan, A.; Marois, C.; Song, I.; MacIntosh, B.; Graham, J. R.; Doyon, R.; Bessell, M. S.; Thomas, S.; Lai, O. (2014)."The VAST Survey - III. The multiplicity of A-type stars within 75 pc".Monthly Notices of the Royal Astronomical Society.437 (2): 1216.arXiv:1311.7141.Bibcode:2014MNRAS.437.1216D.doi:10.1093/mnras/stt1932.S2CID 88503488.
  5. ^abcDucati, 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.
  6. ^Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities".Determination of Radial Velocities and Their Applications.30: 57.Bibcode:1967IAUS...30...57E.
  7. ^abKiss, L. L.; Alfaro, E. J.; Bakos, G.; Csak, B.; Szatmary, K. (1999). "On the monoperiodicity of the suspected delta Scuti star Iota Bootis".Information Bulletin on Variable Stars.4698: 1.Bibcode:1999IBVS.4698....1K.
  8. ^Gray, R. O.; Graham, P. W.; Hoyt, S. R. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. II. Basic Parameters of Program Stars and the Role of Microturbulence".The Astronomical Journal.121 (4): 2159.Bibcode:2001AJ....121.2159G.doi:10.1086/319957.
  9. ^Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities".Astronomy & Astrophysics.537: A120.arXiv:1201.2052.Bibcode:2012A&A...537A.120Z.doi:10.1051/0004-6361/201117691.S2CID 55586789.
  10. ^Star Name - R.H. Allen p.105
  11. ^Kiss, L. L. (August 1995). "BV Photometry of the Delta Scuti Star iota Bootis".Information Bulletin on Variable Stars.4237: 1.Bibcode:1995IBVS.4237....1K.
  12. ^Abt, H. A. (March 1981). "Visual multiples. VII - MK classifications".Astrophysical Journal Supplement Series.45:437–456.Bibcode:1981ApJS...45..437A.doi:10.1086/190719.
  13. ^abMason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog".The Astronomical Journal.122 (6): 3466.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.
  14. ^Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties".Astronomy and Astrophysics.674: A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this source atVizieR.
  15. ^Vallenari, A.; et al. (Gaia collaboration) (2023)."Gaia Data Release 3. Summary of the content and survey properties".Astronomy and Astrophysics.674: A1.arXiv:2208.00211.Bibcode:2023A&A...674A...1G.doi:10.1051/0004-6361/202243940.S2CID 244398875. Gaia DR3 record for this source atVizieR.
  16. ^Allen, R. H. (1963).Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 105.ISBN 0-486-21079-0. Retrieved2010-12-12.
  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 theWayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.

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