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Iota Aurigae

October 20, 2023

Iota Aurigae (ι Aurigae, abbreviated Iota Aur, ι Aur), officially named Hassaleh /ˈhæsəleɪ/,[12] is a star in the northern constellation of Auriga. It has an apparent visual magnitude of 2.7,[2] which is bright enough to be readily visible to the naked eye. Parallax measurements give a distance estimate of roughly 490 light-years (150 parsecs) from the Sun.

ι Aurigae
Location of ι Aurigae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 04h 56m 59.62109s[1]
Declination +33° 09′ 57.9585″[1]
Apparent magnitude (V) 2.69[2]
Characteristics
Spectral type K3 II[3]
U−B color index +1.78[2]
B−V color index +1.53[2]
Variable type Suspected[4]
Astrometry
Radial velocity (Rv)+17.78[5] km/s
Proper motion (μ) RA: +6.79[1] mas/yr
Dec.: −14.88[1] mas/yr
Parallax (π)6.61 ± 0.38 mas[1]
Distance490 ± 30 ly
(151 ± 9 pc)
Absolute magnitude (MV)−3.20[6]
Details
Mass7.1 ± 0.7[7] M☉
Radius127[8] R☉
Luminosity4,581[6] L☉
Surface gravity (log g)1.74[9] cgs
Temperature4,160[9] K
Metallicity [Fe/H]–0.11[9] dex
Rotational velocity (v sin i)8[10] km/s
Age39.8 ± 4.9[7] Myr
Other designations
Hassaleh, Kabdhilinan, ι Aur, 3 Aurigae, BD+32°855, FK5 181, GC 6029, HD 31398, HIP 23015, HR 1577, SAO 57522[11]
Database references
SIMBADdata

Nomenclature Edit

ι Aurigae (Latinised to Iota Aurigae) is the star's Bayer designation.

It bore the traditional name Al Kab,[13] short for Kabdhilinan /kæbˈdɪlɪnæn/, from the Arabic كعب ذي العنان kaʽb ðīl-ʽinān[14][15] "the ankle[16] of the rein holder (charioteer)".[13] Under the name Alkab, this star is a marker on the astrolabe described by Geoffrey Chaucer in his Treatise on the Astrolabe in 1391.

It bore the novel name Hassaleh in Antonín Bečvář's 1951 atlas. The origin and meaning of the name have not been discovered despite extensive search, and no connection to any language has been discovered.[17] The IAU Working Group on Star Names (WGSN)has approved the proper name Hassaleh for this star.[12]

It is known as 五車一 (the First Star of the Five Chariots) in Chinese.[18]

Properties Edit

At Iota Aurigae's distance, extinction from interstellar dust is causing a magnitude reduction of about 0.6.[13] Examination of the spectrum yields a stellar classification of K3 II,[3] with the luminosity class of 'II' indicating this is a category of evolved star known as a bright giant. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[19] The effective temperature of the outer envelope is 4,160 K,[9] which is cooler than the Sun's effective temperature and gives Iota Aurigae the orange hue of a K-type star.[20]

It is a weak X-ray emitter with an X-ray luminosity of about 1.8 × 1027 ergs s−1. This emission is most likely coming from transient loops of plasma in Iota Aurigae's outer atmosphere, which have a temperature of around 3 million K.[21] This is a suspected variable star, although this variability remains unconfirmed.[4]

Unconfirmed substellar companions Edit

During the Extreme Solar Systems conference held on June 25–29, 2007, in Santorini, Greece, Reffert et al. announced the detection of two substellar objects orbiting Iota Aurigae in 2:1 resonance. Such companions would be brown dwarfs with orbital periods of approximately 2 and 4 years. No minimum mass for the candidates was provided. So far the detection has not been confirmed, though Hekker et al. (2008) listed significant radial velocity variations at periods of 767 and 1586 days.[22][23]

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, S2CID 18759600
  2. ^ a b c d 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
  3. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333
  4. ^ a b Strassmeier, K. G. (January 2008), "Stellar Activity with BRITE: the Aurigae field", Communications in Asteroseismology, 152: 124–130, Bibcode:2008CoAst.152..124S, doi:10.1553/cia152s124
  5. ^ Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304
  6. ^ a b Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644
  7. ^ a b 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
  8. ^ Harper, G. M. (1992), "The outer atmospheres of the 'hybrid' bright giants - The chromospheres of Alpha TrA (K4 II), IOTA AUR (K3 II), Gamma AQL (K3 II) and Theta HER (K1 II)", Monthly Notices of the Royal Astronomical Society, 256 (1): 37–64, arXiv:0809.0359, Bibcode:1992MNRAS.256...37H, doi:10.1093/mnras/256.1.37
  9. ^ a b c d McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527, ISSN 0067-0049
  10. ^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B
  11. ^ "iot Aur -- Variable Star", SIMBAD, Centre de Données astronomiques de Strasbourg, retrieved 2012-01-19
  12. ^ a b Naming Stars, IAU.org, retrieved 16 December 2017
  13. ^ a b c Kaler, James B., , Stars, University of Illinois at Urbana-Champaign, archived from the original on 2008-12-10, retrieved 2012-01-18
  14. ^ Allen, Richard Hinckley (1899), Star-names and their meanings, G. E. Stechert, p. 91
  15. ^ ʿAbd al-Raḥmān ibn ʿUmar al-Ṣūfī. صور الكواكب الثابتة (Book of Fixed Stars). Manuscript from the National Library of France.
  16. ^ Translation of the Arabic word كعب to English on the Almaany dictionaries website.
  17. ^ Kunitzsch, Paul; Smart, Tim (2006), A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.), Cambridge, Massachusetts: Sky Pub, ISBN 978-1-931559-44-7
  18. ^ Ian Ridpath, "Auriga", Star Tales, retrieved 2019-10-10
  19. ^ Garrison, R. F. (December 1993), , Bulletin of the American Astronomical Society, 25: 1319, Bibcode:1993AAS...183.1710G, archived from the original on 2019-06-25, retrieved 2012-02-04
  20. ^ , Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-01-16
  21. ^ Kashyap, V.; et al. (August 1994), "X-ray emission on hybrid stars: ROSAT observations of alpha Trianguli Australis and IOTA Aurigae", The Astrophysical Journal, 431 (1): 402–415, Bibcode:1994ApJ...431..402K, doi:10.1086/174494{{citation}}: CS1 maint: multiple names: authors list (link)
  22. ^ Hekker, S.; et al. (2008), "Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties", Astronomy and Astrophysics, 480 (1): 215–222, arXiv:0801.0741, Bibcode:2008A&A...480..215H, doi:10.1051/0004-6361:20078321, S2CID 33442610
  23. ^ Reffert, S.; et al. (2008), "Two brown dwarfs in resonance around a K3II giant", (PDF), p. 115, archived from the original (PDF) on 18 July 2011, retrieved 18 November 2009

External links Edit

  • HR 1577
  • Image Iota Aurigae

October 20, 2023
iota, aurigae, aurigae, abbreviated, iota, officially, named, hassaleh, star, northern, constellation, auriga, apparent, visual, magnitude, which, bright, enough, readily, visible, naked, parallax, measurements, give, distance, estimate, roughly, light, years,. Iota Aurigae i Aurigae abbreviated Iota Aur i Aur officially named Hassaleh ˈ h ae s e l eɪ 12 is a star in the northern constellation of Auriga It has an apparent visual magnitude of 2 7 2 which is bright enough to be readily visible to the naked eye Parallax measurements give a distance estimate of roughly 490 light years 150 parsecs from the Sun i AurigaeLocation of i Aurigae circled Observation dataEpoch J2000 Equinox J2000Constellation AurigaRight ascension 04h 56m 59 62109s 1 Declination 33 09 57 9585 1 Apparent magnitude V 2 69 2 CharacteristicsSpectral type K3 II 3 U B color index 1 78 2 B V color index 1 53 2 Variable type Suspected 4 AstrometryRadial velocity Rv 17 78 5 km sProper motion m RA 6 79 1 mas yr Dec 14 88 1 mas yrParallax p 6 61 0 38 mas 1 Distance490 30 ly 151 9 pc Absolute magnitude MV 3 20 6 DetailsMass7 1 0 7 7 M Radius127 8 R Luminosity4 581 6 L Surface gravity log g 1 74 9 cgsTemperature4 160 9 KMetallicity Fe H 0 11 9 dexRotational velocity v sin i 8 10 km sAge39 8 4 9 7 MyrOther designationsHassaleh Kabdhilinan i Aur 3 Aurigae BD 32 855 FK5 181 GC 6029 HD 31398 HIP 23015 HR 1577 SAO 57522 11 Database referencesSIMBADdata Contents 1 Nomenclature 2 Properties 2 1 Unconfirmed substellar companions 3 References 4 External linksNomenclature Editi Aurigae Latinised to Iota Aurigae is the star s Bayer designation It bore the traditional name Al Kab 13 short for Kabdhilinan k ae b ˈ d ɪ l ɪ n ae n from the Arabic كعب ذي العنان kaʽb dil ʽinan 14 15 the ankle 16 of the rein holder charioteer 13 Under the name Alkab this star is a marker on the astrolabe described by Geoffrey Chaucer in his Treatise on the Astrolabe in 1391 It bore the novel name Hassaleh in Antonin Becvar s 1951 atlas The origin and meaning of the name have not been discovered despite extensive search and no connection to any language has been discovered 17 The IAU Working Group on Star Names WGSN has approved the proper name Hassaleh for this star 12 It is known as 五車一 the First Star of the Five Chariots in Chinese 18 Properties EditAt Iota Aurigae s distance extinction from interstellar dust is causing a magnitude reduction of about 0 6 13 Examination of the spectrum yields a stellar classification of K3 II 3 with the luminosity class of II indicating this is a category of evolved star known as a bright giant Since 1943 the spectrum of this star has served as one of the stable anchor points by which other stars are classified 19 The effective temperature of the outer envelope is 4 160 K 9 which is cooler than the Sun s effective temperature and gives Iota Aurigae the orange hue of a K type star 20 It is a weak X ray emitter with an X ray luminosity of about 1 8 1027 ergs s 1 This emission is most likely coming from transient loops of plasma in Iota Aurigae s outer atmosphere which have a temperature of around 3 million K 21 This is a suspected variable star although this variability remains unconfirmed 4 Unconfirmed substellar companions Edit During the Extreme Solar Systems conference held on June 25 29 2007 in Santorini Greece Reffert et al announced the detection of two substellar objects orbiting Iota Aurigae in 2 1 resonance Such companions would be brown dwarfs with orbital periods of approximately 2 and 4 years No minimum mass for the candidates was provided So far the detection has not been confirmed though Hekker et al 2008 listed significant radial velocity variations at periods of 767 and 1586 days 22 23 References Edit 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 amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d 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 a b Morgan W W Keenan P C 1973 Spectral Classification Annual Review of Astronomy and Astrophysics 11 29 Bibcode 1973ARA amp A 11 29M doi 10 1146 annurev aa 11 090173 000333 a b Strassmeier K G January 2008 Stellar Activity with BRITE the Aurigae field Communications in Asteroseismology 152 124 130 Bibcode 2008CoAst 152 124S doi 10 1553 cia152s124 Famaey B et al January 2005 Local kinematics of K and M giants from CORAVEL Hipparcos Tycho 2 data Revisiting the concept of superclusters Astronomy and Astrophysics 430 1 165 186 arXiv astro ph 0409579 Bibcode 2005A amp A 430 165F doi 10 1051 0004 6361 20041272 S2CID 17804304 a b Anderson E Francis Ch 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 S2CID 119257644 a b Tetzlaff N Neuhauser 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 Harper G M 1992 The outer atmospheres of the hybrid bright giants The chromospheres of Alpha TrA K4 II IOTA AUR K3 II Gamma AQL K3 II and Theta HER K1 II Monthly Notices of the Royal Astronomical Society 256 1 37 64 arXiv 0809 0359 Bibcode 1992MNRAS 256 37H doi 10 1093 mnras 256 1 37 a b c d McWilliam Andrew December 1990 High resolution spectroscopic survey of 671 GK giants Astrophysical Journal Supplement Series 74 1075 1128 Bibcode 1990ApJS 74 1075M doi 10 1086 191527 ISSN 0067 0049 Bernacca P L Perinotto M 1970 A catalogue of stellar rotational velocities Contributi Osservatorio Astronomico di Padova in Asiago 239 1 1 Bibcode 1970CoAsi 239 1B iot Aur Variable Star SIMBAD Centre de Donnees astronomiques de Strasbourg retrieved 2012 01 19 a b Naming Stars IAU org retrieved 16 December 2017 a b c Kaler James B Al Kab Stars University of Illinois at Urbana Champaign archived from the original on 2008 12 10 retrieved 2012 01 18 Allen Richard Hinckley 1899 Star names and their meanings G E Stechert p 91 ʿAbd al Raḥman ibn ʿUmar al Ṣufi صور الكواكب الثابتة Book of Fixed Stars Manuscript from the National Library of France Translation of the Arabic word كعب to English on the Almaany dictionaries website Kunitzsch Paul Smart Tim 2006 A Dictionary of Modern star Names A Short Guide to 254 Star Names and Their Derivations 2nd rev ed Cambridge Massachusetts Sky Pub ISBN 978 1 931559 44 7 Ian Ridpath Auriga Star Tales retrieved 2019 10 10 Garrison R F December 1993 Anchor Points for the MK System of Spectral Classification Bulletin of the American Astronomical Society 25 1319 Bibcode 1993AAS 183 1710G archived from the original on 2019 06 25 retrieved 2012 02 04 The Colour of Stars Australia Telescope Outreach and Education Commonwealth Scientific and Industrial Research Organisation December 21 2004 archived from the original on February 22 2012 retrieved 2012 01 16 Kashyap V et al August 1994 X ray emission on hybrid stars ROSAT observations of alpha Trianguli Australis and IOTA Aurigae The Astrophysical Journal 431 1 402 415 Bibcode 1994ApJ 431 402K doi 10 1086 174494 a href Template Citation html title Template Citation citation a CS1 maint multiple names authors list link Hekker S et al 2008 Precise radial velocities of giant stars IV A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties Astronomy and Astrophysics 480 1 215 222 arXiv 0801 0741 Bibcode 2008A amp A 480 215H doi 10 1051 0004 6361 20078321 S2CID 33442610 Reffert S et al 2008 Two brown dwarfs in resonance around a K3II giant Extreme Solar Systems ASP Conference Series Vol 398 proceedings of the conference held 25 29 June 2007 at Santorini Island Greece PDF p 115 archived from the original PDF on 18 July 2011 retrieved 18 November 2009External links EditHR 1577 The Constellations and Named Stars Image Iota Aurigae Extreme Solar Systems posters Extreme Solar Systems Abstracts Retrieved from https en wikipedia org w index php title Iota Aurigae amp oldid 1170110775, 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