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{{Starbox begin
{{Starbox begin}}
| name=IQ Aurigae
}}
{{Starbox observe
{{Starbox observe
| epoch=J2000
| epoch = J2000
| constell = [[Auriga (constellation)|Auriga]]
| ra={{RA|05|19|00.02928}}<ref name="van Leeuwen2007"/>
| dec={{DEC|+33|44|54.2159}}<ref name="van Leeuwen2007"/>
| ra = {{RA|05|19|00.02850}}<ref name=GaiaDR2/>
| appmag_v=5.35<ref name="MERMILLIOD"/>
| dec = {{DEC|+33|44|54.2374}}<ref name=GaiaDR2/>
| appmag_v = 5.38<ref name=Anderson2012/>
| constell=[[Auriga (constellation)|Auriga]]
}}
}}
{{Starbox character
{{Starbox character
| class=A0pSi<ref name=aj74_375/>
| type = main sequence<ref name=Robrade2011/>
| class = A0pSi<ref name=aj74_375/>
| r-i =
| b-v = {{Val|−0.167|0.004}}<ref name=Anderson2012/>
| v-r =
| b-v = −0.19<ref name="MERMILLIOD"/>
| u-b = −0.62<ref name="MERMILLIOD"/>
| variable = [[Alpha2 Canum Venaticorum variable|α<sup>2</sup> CVn]]<ref name=Samus2017/>
| u-b = −0.62<ref name="MERMILLIOD"/>
| variable=[[Alpha² Canum Venaticorum variable|α² CVn]]
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v=+28.6<ref name="Gontcharov"/>
| radial_v = +28.6<ref name="Gontcharov"/>
| prop_mo_ra=+14.17<ref name="van Leeuwen2007"/>
| prop_mo_ra = +13.557<ref name=GaiaDR2/>
| prop_mo_dec=-29.75<ref name="van Leeuwen2007"/>
| prop_mo_dec = −30.086<ref name=GaiaDR2/>
| parallax=7.89
| parallax = 6.8800
| p_error=0.37
| p_error = 0.1683
| parallax_footnote=<ref name="van Leeuwen2007"/>
| parallax_footnote = <ref name=GaiaDR2/>
| absmag_v=–0.42<ref name=aaa334_181/>
| absmag_v = –0.42<ref name=aaa334_181/>
}}
}}
{{Starbox detail
{{Starbox detail
| mass={{nowrap|3.95 ± 0.21}}<ref name=aaa334_181/>
| source = <ref name=aaa334_181/>
| radius={{nowrap|2.6 ± 0.4}}<ref name=aaa334_181/>
| mass = {{Val|3.95|0.21}}
| radius = {{Val|2.6|0.4}}
| luminosity=263<ref name=aaa334_181/>
| luminosity = 263
| temperature=14,454<ref name=aaa334_181/>
| temperature = 14,454
| metal_fe=1.70<ref name=aa_9_380/>
| gravity={{nowrap|4.34 ± 0.12}}<ref name=aaa334_181/>
| metal_fe = 1.70<ref name=aa_9_380/>
| gravity = {{nowrap|4.34 ± 0.12}}
| rotation=2.4660&nbsp;days<ref name=aaa334_181/>
| rotation = 2.4660&nbsp;days
| rotational_velocity=49<ref name=aa393_897/>
| rotational_velocity = 49
| age_myr=
| age_myr = 6.3<ref name=Robrade2011/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = {{odlist | V=IQ Aur | BD=+33° 1008 | HD=34452 | HIP=24799 | HR=1732 | SAO=57884 | AAVSO=0512+33 }}<ref name=SIMBAD/>
| names=[[Bonner Durchmusterung|BD]]+33° 1008, [[Henry Draper Catalogue|HD]] 34452, [[Hipparcos Catalogue|HIP]] 24799, [[Bright Star Catalogue|HR]] 1732, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 57884.
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+34452
| Simbad = IQ+Aur
| ARICNS =
}}
}}
{{Starbox end}}
{{Starbox end}}


'''IQ Aurigae''' is a [[variable star]] in the northern [[constellation]] of [[Auriga (constellation)|Auriga]]. The spectrum displays the characteristics of a [[peculiar star]]; in this instance a strong [[Spectral line|line]] of singly ionized silicon. For this reason it is known as a silicon star. It may also be helium deficient as the lines of helium are weaker than expected.<ref name=aa_9_380/>
'''IQ Aurigae''' is a (most likely) single,<ref name=Robrade2011/> [[variable star]] in the northern [[constellation]] of [[Auriga (constellation)|Auriga]]. It is visible to the naked eye as a dim, white-hued star with an [[apparent visual magnitude]] that fluctuates around 5.38.<ref name=Anderson2012/> The star is located at a distance of about 470&nbsp;[[light year]]s away from the Sun based on [[stellar parallax|Parallax]],<ref name=GaiaDR2/> and is drifting further away with a [[radial velocity]] of +28.6&nbsp;km/s.<ref name="Gontcharov"/>

This is a magnetic [[Ap star]] with a [[stellar classification]] of A0pSi.<ref name=Robrade2011/> It is known as a silicon star, having a strong [[Spectral line|line]] of singly ionized silicon, and may also be helium deficient as the lines of helium are weaker than expected.<ref name=aa_9_380/> The star is a [[Alpha2 Canum Venaticorum variable|Alpha<sup>2</sup> Canum Venaticorum]]-type variable, ranging in magnitude from 5.35 down to 5.43 with a rotationally-modulated period of 2.4660&nbsp;days.<ref name=Samus2017/> It is an [[X-ray astronomy|X-ray source]] with a high luminosity of {{Val|4e29|u=erg s<sup>−1</sup>}}, which may be caused by a combination of [[Shock (mechanics)|shocks]] in the [[stellar wind]] and [[magnetic reconnection]] occurring well above the stellar surface. The star has been observed to [[Flare star|flare]], during which the X-ray emission rose to {{Val|3.2e31|u=erg s<sup>−1</sup>}}.<ref name=Robrade2011/>

IQ Aurigae is 6.3<ref name=Robrade2011/>&nbsp;million years old and is spinning with a [[projected rotational velocity]] of 49&nbsp;km/s, giving it a rotation period of 2.47&nbsp;days.<ref name=aaa334_181/> It has nearly four times the [[mass of the Sun]] and 2.6 times the [[Sun's radius]]. The star is radiating 263 times the [[luminosity of the Sun]] from its active [[photosphere]] at an [[effective temperature]] of 14,454&nbsp;K.<ref name=aaa334_181/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=


<ref name=GaiaDR2>{{cite DR2|181233674136088960}}</ref>
<ref name="van Leeuwen2007">{{citation

| title=Validation of the new Hipparcos reduction
<ref name=SIMBAD>{{cite simbad | title=IQ Aur | accessdate=2019-08-17 }}</ref>
| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics
<ref name=Anderson2012>{{citation
| volume=474 | issue=2 | pages=653–664 | date=2007
| title=XHIP: An extended hipparcos compilation
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| doi=10.1051/0004-6361:20078357
| journal=Astronomy Letters
}}[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=114184 Vizier catalog entry ]</ref>
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | postscript=. }}</ref>

<ref name=Samus2017>{{citation | postscript=.
| title=General catalogue of variable stars: Version GCVS 5.1
| last1=Samus' | first1=N. N | last2=Kazarovets | first2=E. V
| last3=Durlevich | first3=O. V | last4=Kireeva | first4=N. N
| last5=Pastukhova | first5=E. N | journal=Astronomy Reports
| display-authors=1 | volume=61 | issue=1 | pages=80 | year=2017
| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S }}</ref>


<ref name=aaa334_181>{{citation
<ref name=aaa334_181>{{citation
Line 65: Line 77:
| journal=Astronomy and Astrophysics
| journal=Astronomy and Astrophysics
| volume=334 | pages=181–187 | date=June 1998
| volume=334 | pages=181–187 | date=June 1998
| bibcode=1998A&A...334..181N
| bibcode=1998A&A...334..181N | postscript=.
| arxiv=astro-ph/9802286
| arxiv=astro-ph/9802286 }}</ref>
}}</ref>


<ref name=Robrade2011>{{citation
<ref name="Gontcharov">{{Cite journal| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G| title = Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system| journal = Astronomy Letters| volume = 32| issue = 11| pages = 759–771| date = November 2006| last1 = Gontcharov | first1 = G. A.|arxiv = 1606.08053 }}</ref>
| title=New X-ray observations of IQ Aurigae and α2 Canum Venaticorum. Probing the magnetically channeled wind shock model in A0p stars
| last1=Robrade | first1=J. | last2=Schmitt | first2=J. H. M. M.
| journal=Astronomy & Astrophysics
| volume=531 | id=A58 | pages=11 | date=July 2011
| arxiv=1105.3688 | bibcode=2011A&A...531A..58R
| doi=10.1051/0004-6361/201116843 | postscript=. }}</ref>


<ref name=aj74_375>{{citation
<ref name="Gontcharov">{{citation
| last1=Gontcharov | first1=G. A.
| display-authors=1
| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
| last1=Cowley | first1=A.
| journal=Astronomy Letters
| last2=Cowley | first2=C.
| volume=32 | issue=11 | pages=759–771 | date=November 2006
| last3=Jaschek | first3=M.
| bibcode=2006AstL...32..759G | arxiv=1606.08053
| last4=Jaschek | first4=C.
| doi = 10.1134/S1063773706110065 | postscript=. }}</ref>

<ref name=aj74_375>{{citation | postscript=.
| last1=Cowley | first1=A. | last2=Cowley | first2=C.
| last3=Jaschek | first3=M. | last4=Jaschek | first4=C.
| title=A study of the bright A stars. I. A catalogue of spectral classifications
| title=A study of the bright A stars. I. A catalogue of spectral classifications
| journal=Astronomical Journal
| display-authors=1 | journal=Astronomical Journal
| volume=74 | pages=375–406 | date=April 1969
| volume=74 | pages=375–406 | date=April 1969
| doi=10.1086/110819
| doi=10.1086/110819 | bibcode=1969AJ.....74..375C }}</ref>
| bibcode=1969AJ.....74..375C
}}</ref>

<ref name=aa393_897>{{citation
| display-authors=1
| last1=Royer | first1=F.
| last2=Grenier | first2=S.
| last3=Baylac | first3=M.-O.
| last4=Gómez | first4=A. E.
| last5=Zorec | first5=J.
| title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i
| journal=Astronomy and Astrophysics | volume=393 | pages=897–911
| date=October 2002
| doi=10.1051/0004-6361:20020943
| bibcode=2002A&A...393..897R
|arxiv = astro-ph/0205255 }}</ref>


<ref name="MERMILLIOD">{{citation
<ref name="MERMILLIOD">{{citation
| last1=Mermilliod | first1=J.-C.
| last1=Mermilliod | first1=J.-C. | postscript=.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV data. SIMBAD
| journal=Catalogue of Eggen's UBV data. SIMBAD
| date=1986 | bibcode=1986EgUBV........0M
| date=1986 | bibcode=1986EgUBV........0M }}</ref>
}}</ref>


<ref name=aa_9_380>{{citation
<ref name=aa_9_380>{{citation
| last1=Tomley | first1=L. J.
| display-authors=1 | last1=Tomley | first1=L. J.
| last2=Wallerstein | first2=G.
| last2=Wallerstein | first2=G. | last3=Wolff | first3=S. C.
| last3=Wolff | first3=S. C.
| title=A spectroscopic analysis of the silicon star HD 34452.
| title=A spectroscopic analysis of the silicon star HD 34452.
| journal=Astronomy and Astrophysics
| journal=Astronomy and Astrophysics | postscript=.
| volume=9 | pages=380–391
| volume=9 | pages=380–391 | date=December 1970
| bibcode=1970A&A.....9..380T }}</ref>
| date=December 1970
| bibcode=1970A&A.....9..380T
}}</ref>


}}
}}
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{{Stars of Auriga}}
{{Stars of Auriga}}
<!-- Properties -->

[[Category:Auriga (constellation)]]
[[Category:A-type main-sequence stars]]
[[Category:Ap star]]
[[Category:Alpha2 Canum Venaticorum variables]]
[[Category:Alpha2 Canum Venaticorum variables]]
[[Category:Astronomical X-ray sources]]
<!-- Identifiers -->
[[Category:Auriga (constellation)]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|034452]]
[[Category:Henry Draper Catalogue objects|034452]]
[[Category:Hipparcos objects|024799]]
[[Category:Hipparcos objects|024799]]
[[Category:A-type main-sequence stars]]
[[Category:HR objects|1732]]
[[Category:Objects with variable star designations|Aurigae, IQ]]
[[Category:Objects with variable star designations|Aurigae, IQ]]
[[Category:Durchmusterung objects]]
[[Category:HR objects|1732]]

{{var-star-stub}}

Revision as of 14:18, 18 August 2019

IQ Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 19m 00.02850s[1]
Declination +33° 44′ 54.2374″[1]
Apparent magnitude (V) 5.38[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A0pSi[4]
U−B color index −0.62[5]
B−V color index −0.167±0.004[2]
Variable type α2 CVn[6]
Astrometry
Radial velocity (Rv)+28.6[7] km/s
Proper motion (μ) RA: +13.557[1] mas/yr
Dec.: −30.086[1] mas/yr
Parallax (π)6.8800 ± 0.1683 mas[1]
Distance470 ± 10 ly
(145 ± 4 pc)
Absolute magnitude (MV)–0.42[8]
Details[8]
Mass3.95±0.21 M☉
Radius2.6±0.4 R☉
Luminosity263 L☉
Surface gravity (log g)4.34 ± 0.12 cgs
Temperature14,454 K
Metallicity [Fe/H]1.70[9] dex
Rotation2.4660 days
Rotational velocity (v sin i)49 km/s
Age6.3[3] Myr
Other designations
IQ Aur, BD+33° 1008, HD 34452, HIP 24799, HR 1732, SAO 57884[10]
Database references
SIMBADdata

IQ Aurigae is a (most likely) single,[3] variable star in the northern constellation of Auriga. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude that fluctuates around 5.38.[2] The star is located at a distance of about 470 light years away from the Sun based on Parallax,[1] and is drifting further away with a radial velocity of +28.6 km/s.[7]

This is a magnetic Ap star with a stellar classification of A0pSi.[3] It is known as a silicon star, having a strong line of singly ionized silicon, and may also be helium deficient as the lines of helium are weaker than expected.[9] The star is a Alpha2 Canum Venaticorum-type variable, ranging in magnitude from 5.35 down to 5.43 with a rotationally-modulated period of 2.4660 days.[6] It is an X-ray source with a high luminosity of 4×1029 erg s−1, which may be caused by a combination of shocks in the stellar wind and magnetic reconnection occurring well above the stellar surface. The star has been observed to flare, during which the X-ray emission rose to 3.2×1031 erg s−1.[3]

IQ Aurigae is 6.3[3] million years old and is spinning with a projected rotational velocity of 49 km/s, giving it a rotation period of 2.47 days.[8] It has nearly four times the mass of the Sun and 2.6 times the Sun's radius. The star is radiating 263 times the luminosity of the Sun from its active photosphere at an effective temperature of 14,454 K.[8]

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c 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.
  3. ^ a b c d e f Robrade, J.; Schmitt, J. H. M. M. (July 2011), "New X-ray observations of IQ Aurigae and α2 Canum Venaticorum. Probing the magnetically channeled wind shock model in A0p stars", Astronomy & Astrophysics, 531: 11, arXiv:1105.3688, Bibcode:2011A&A...531A..58R, doi:10.1051/0004-6361/201116843, A58.
  4. ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  5. ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M.
  6. ^ a b Samus', N. N; et al. (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  7. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  8. ^ a b c d North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.
  9. ^ a b Tomley, L. J.; et al. (December 1970), "A spectroscopic analysis of the silicon star HD 34452.", Astronomy and Astrophysics, 9: 380–391, Bibcode:1970A&A.....9..380T.
  10. ^ "IQ Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-17.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=IQ_Aurigae&oldid=911381348"