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Iota Boötis

October 20, 2023

Iota Boötis (ι Boo, ι Boötis) is a member of a binary star system in the constellation Boötes, approximately 96 light-years from Earth. It has the traditional name Asellus Secundus /əˈsɛləs sɪˈkʌndəs/ (Latin for "second donkey colt") and the Flamsteed designation 21 Boötis. The companion is HD 234121, a K0 main sequence star.

ι Boötis
Location of ι Boötis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 16m 09.92976s[1]
Declination +51° 22′ 02.0287″[1]
Apparent magnitude (V) 4.75[2] (4.73 – 4.78[3])
Characteristics
Spectral type A7 V[4]
U−B color index +0.06[5]
B−V color index +0.20[5]
R−I color index +0.09[5]
Variable type Delta 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.)

Components Edit

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

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

The primary component is a white A-type main-sequence dwarf with a mean apparent magnitude of +4.75. It is classified as a Delta Scuti-type variable 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 to spectral class K0V.[12][13] It is separated from ι Boo by 1,100 AU.[4] HD 234121 has a mass of 0.8 M☉, a luminosity of 0.4 L☉, a temperature of 5,090 K, and a radius of 0.8 R☉.[14]

The Washington 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 other Aselli (θ Boo and κ Boo) and λ Boo, were Aulād al Dhiʼbah (أولاد الضّباع - awlād al-ḍibā‘), "the Whelps of the Hyenas".[the transcription does not match the Arabic][16]

In Chinese, 天槍 (Tiān Qiāng), meaning Celestial Spear, refers to an asterism consisting of ι Boötis, κ2 Boötis and θ Boötis.[17] Consequently, the Chinese name for ι Boötis itself is 天槍二 (Tiān Qiāng èr, English: the Second Star of Celestial Spear).[18]

References Edit

  1. ^ a b c d e f g h i j 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 at VizieR.
  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. ^ a b Samus, 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. ^ a b c De 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. ^ a b c 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.
  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. ^ a b Kiss, 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. ^ a b Mason, 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 at VizieR.
  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 at VizieR.
  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. Retrieved 2010-12-12.
  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 2010-08-11 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.

External links Edit

  • HR 5350
  • CCDM J14162+5122
  • Image Iota Boötis

October 20, 2023
iota, boötis, boötis, member, binary, star, system, constellation, boötes, approximately, light, years, from, earth, traditional, name, asellus, secundus, latin, second, donkey, colt, flamsteed, designation, boötis, companion, 234121, main, sequence, star, boö. Iota Bootis i Boo i Bootis is a member of a binary star system in the constellation Bootes approximately 96 light years from Earth It has the traditional name Asellus Secundus e ˈ s ɛ l e s s ɪ ˈ k ʌ n d e s Latin for second donkey colt and the Flamsteed designation 21 Bootis The companion is HD 234121 a K0 main sequence star i BootisLocation of i Bootis circled Observation dataEpoch J2000 Equinox J2000Constellation BootesRight ascension 14h 16m 09 92976s 1 Declination 51 22 02 0287 1 Apparent magnitude V 4 75 2 4 73 4 78 3 CharacteristicsSpectral type A7 V 4 U B color index 0 06 5 B V color index 0 20 5 R I color index 0 09 5 Variable type Delta Scuti variable 3 AstrometryRadial velocity Rv 18 7 6 km sProper motion m RA 149 277 1 mas yr Dec 89 135 1 mas yrParallax p 33 8856 0 0820 mas 1 Distance96 3 0 2 ly 29 51 0 07 pc Absolute magnitude MV 2 38 7 DetailsMass1 81 4 M Radius1 7 1 R Luminosity8 8 1 L Surface gravity log g 4 14 1 cgsTemperature7 764 1 KMetallicity Fe H 0 19 8 dexRotational velocity v sin i 144 9 km sAge785 1 MyrOther designationsAsellus Secondus 10 21 Bootis BD 52 1784 FK5 528 HD 125161 HIP 69713 HR 5350 SAO 29071 Wo 9474 WDS J14162 5122Database referencesSIMBADdataData sources Hipparcos Catalogue CCDM 2002 Bright Star Catalogue 5th rev ed Contents 1 Components 2 Nomenclature 3 References 4 External linksComponents Edit nbsp i Bootis and its nearby companion HD 234121 the faint component C is also visible to the south nbsp A visual band light curve for Iota Bootis adapted from Kiss 1995 11 Iota Bootis has a companion at an angular distance of 38 6 arcseconds easily separated with binoculars The primary component is a white A type main sequence dwarf with a mean apparent magnitude of 4 75 It is classified as a Delta Scuti type variable 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 to spectral class K0V 12 13 It is separated from i Boo by 1 100 AU 4 HD 234121 has a mass of 0 8 M a luminosity of 0 4 L a temperature of 5 090 K and a radius of 0 8 R 14 The Washington Double Star Catalog lists a third component a 14th magnitude star at 90 arcseconds 13 but it is an unrelated background star 15 Nomenclature EditThis star along with the other Aselli 8 Boo and k Boo and l Boo were Aulad al Dhiʼbah أولاد الض باع awlad al ḍiba the Whelps of the Hyenas the transcription does not match the Arabic 16 In Chinese 天槍 Tian Qiang meaning Celestial Spear refers to an asterism consisting of i Bootis k2 Bootis and 8 Bootis 17 Consequently the Chinese name for i Bootis itself is 天槍二 Tian Qiang er English the Second Star of Celestial Spear 18 References Edit a b c d e f g h i j 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR 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 amp AS 85 1015M a b Samus 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 a b c De 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 a b c 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 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 a b Kiss 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 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 Zorec J Royer F 2012 Rotational velocities of A type stars IV Evolution of rotational velocities Astronomy amp Astrophysics 537 A120 arXiv 1201 2052 Bibcode 2012A amp A 537A 120Z doi 10 1051 0004 6361 201117691 S2CID 55586789 Star Name R H Allen p 105 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 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 a b Mason 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 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR Allen R H 1963 Star Names Their Lore and Meaning Reprint ed New York Dover Publications Inc p 105 ISBN 0 486 21079 0 Retrieved 2010 12 12 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 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 External links EditHR 5350 CCDM J14162 5122 Image Iota Bootis The Constellations and Named Stars Retrieved from https en wikipedia org w index php title Iota Bootis amp oldid 1172394236, wikipedia, wiki, book, books, library,

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