IQ Aurigae: Difference between revisions

IQ Aurigae
	; A light curve for IQ Aurigae from BRITE nanosatellites. Plotted from data published by Strassmeier et al. (2020), assuming a period of 2.463 days.
Observation data; Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	05h 19m 00.02846s
Declination	+33° 44′ 54.2208″
Apparent magnitude (V)	5.38
Characteristics
Evolutionary stage	main sequence
Spectral type	A0pSi
U−B color index	−0.62
B−V color index	−0.167±0.004
Variable type	α2 CVn
Astrometry
Radial velocity (Rv)	+28.6 km/s
Proper motion (μ)	RA: +13.573 mas/yr ; Dec.: −29.028 mas/yr
Parallax (π)	7.0526 ± 0.1065 mas
Distance	462 ± 7 ly ; (142 ± 2 pc)
Absolute magnitude (MV)	−0.42
Details
Mass	3.95±0.21 M☉
Radius	2.6±0.4 R☉
Luminosity	263 L☉
Surface gravity (log g)	4.34±0.12 cgs
Temperature	14,454 K
Metallicity [Fe/H]	1.70 dex
Rotation	2.4660 days
Rotational velocity (v sin i)	49 km/s
Age	6.3 Myr
Other designations
	IQ Aur, BD+33°1008, HD 34452, HIP 24799, HR 1732, SAO 57884
Database references
SIMBAD	data

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IQ Aurigae is a (most likely) single,^[4] 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.^[3] The star is located at a distance of about 460 light-years from the Sun based on parallax and is drifting further away with a radial velocity of +28.6 km/s.^[8]

This is a magnetic Ap star with a stellar classification of A0pSi.^[4] 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.^[10] The star is an Alpha² Canum Venaticorum-type variable, ranging in magnitude from 5.35 down to 5.43 with a rotationally-modulated period of 2.4660 days.^[7] 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.^[4]

IQ Aurigae is 6.3^[4] million years old and is spinning with a projected rotational velocity of 49 km/s, giving it a rotation period of 2.47 days.^[9] 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.^[9]

References

^ Strassmeier, K. G.; Granzer, T.; Weber, M.; Kuschnig, R.; Pigulski, A.; Popowicz, A.; Moffat, A. F.; Wade, G. A.; Zwintz, K.; Handler, G. (December 2020), "BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses", Astronomy & Astrophysics, 644: A104, arXiv:2010.10092, doi:10.1051/0004-6361/202039310, S2CID 224803974.
^ ^a ^b ^c ^d ^e 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.
^ ^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, S2CID 119257644.
^ ^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, S2CID 119245911, A58.
^ 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.
^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
^ ^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, S2CID 125853869.
^ ^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, S2CID 119231169.
^ ^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.
^ ^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.
^ "IQ Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-17.

External links

[Strassmeier-1] Strassmeier, K. G.; Granzer, T.; Weber, M.; Kuschnig, R.; Pigulski, A.; Popowicz, A.; Moffat, A. F.; Wade, G. A.; Zwintz, K.; Handler, G. (December 2020), "BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses", Astronomy & Astrophysics, 644: A104, arXiv:2010.10092, doi:10.1051/0004-6361/202039310, S2CID 224803974.

[GaiaDR3-2] 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.

[Anderson2012-3] 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.

[Robrade2011-4] ^ ^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, S2CID 119245911, A58.

[aj74_375-5] 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.

[MERMILLIOD-6] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.

[Samus2017-7] 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, S2CID 125853869.

[Gontcharov-8] 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, S2CID 119231169.

[aaa334_181-9] 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.

[aa_9_380-10] 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.

[SIMBAD-11] "IQ Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-17.

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@@ Line 1: / Line 1: @@
+{{Short description|Star in the constellation Auriga}}
 {{Starbox begin}}
+{{Starbox image
+| image = [[Image:IQAurLightCurve.png|250px]]
+| caption = A [[light curve]] for IQ Aurigae from [[BRITE]] [[Small_satellite#Nanosatellites|nanosatellites]]. Plotted from data published by Strassmeier ''et al.'' (2020),<ref name="Strassmeier"/> assuming a period of 2.463 days.
+}}
 {{Starbox observe
  | epoch    = J2000
  | constell = [[Auriga (constellation)|Auriga]]
- | ra       = {{RA|05|19|00.02850}}<ref name=GaiaDR2/>
+ | ra       = {{RA|05|19|00.02846}}<ref name=GaiaDR3/>
- | dec      = {{DEC|+33|44|54.2374}}<ref name=GaiaDR2/>
+ | dec      = {{DEC|+33|44|54.2208}}<ref name=GaiaDR3/>
  | appmag_v = 5.38<ref name=Anderson2012/>
 }}
@@ Line 16: / Line 21: @@
 {{Starbox astrometry
  | radial_v = +28.6<ref name="Gontcharov"/>
- | prop_mo_ra  = +13.557<ref name=GaiaDR2/>
+ | prop_mo_ra  = +13.573<ref name=GaiaDR3/>
- | prop_mo_dec = −30.086<ref name=GaiaDR2/>
+ | prop_mo_dec = −29.028<ref name=GaiaDR3/>
- | parallax = 6.8800
+ | parallax = 7.0526
- | p_error  = 0.1683
+ | p_error  = 0.1065
- | parallax_footnote = <ref name=GaiaDR2/>
+ | parallax_footnote = <ref name=GaiaDR3/>
- | absmag_v = –0.42<ref name=aaa334_181/>
+ | absmag_v = −0.42<ref name=aaa334_181/>
 }}
 {{Starbox detail
@@ Line 30: / Line 35: @@
  | temperature = 14,454
  | metal_fe = 1.70<ref name=aa_9_380/>
- | gravity  = {{nowrap|4.34 ± 0.12}}
+ | gravity  = {{val|4.34|0.12}}
  | rotation = 2.4660&nbsp;days
  | rotational_velocity = 49
@@ Line 36: / Line 41: @@
 }}
 {{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    = {{odlist | V=IQ Aur | BD=+33°1008 | HD=34452 | HIP=24799 | HR=1732 | SAO=57884 | AAVSO=0512+33 }}<ref name=SIMBAD/>
 }}
 {{Starbox reference
@@ Line 43: / Line 48: @@
 {{Starbox end}}
-'''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"/>
+'''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 460&nbsp;[[light-year]]s from the Sun based on [[stellar parallax|parallax]] 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/>
+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 an [[Alpha2 Canum Venaticorum variable|Alpha<sup>2</sup> Canum Venaticorum]]-type variable, ranging in magnitude from 5.35 down to 5.43 with a [[Rotational modulation|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/>
@@ Line 52: / Line 57: @@
 {{reflist|refs=
+<ref name="Strassmeier">{{citation |postscript=. |last1=Strassmeier |first1=K. G. |last2=Granzer |first2=T. |last3=Weber |first3=M. |last4=Kuschnig |first4=R. |last5=Pigulski |first5=A. |last6=Popowicz |first6=A. |last7=Moffat |first7=A. F. |last8=Wade |first8=G. A. |last9=Zwintz |first9=K. |last10=Handler |first10=G. |title=BRITE photometry and STELLA spectroscopy of bright stars in Auriga: Rotation, pulsation, orbits, and eclipses |journal=Astronomy & Astrophysics |date=December 2020 |volume=644 |page=A104 |doi=10.1051/0004-6361/202039310 |s2cid=224803974 |doi-access=free |arxiv=2010.10092 }}</ref>
-<ref name=GaiaDR2>{{cite DR2|181233674136088960}}</ref>
-<ref name=SIMBAD>{{cite simbad | title=IQ Aur | accessdate=2019-08-17 }}</ref>
+<ref name=GaiaDR3>{{cite Gaia DR3|181233674136088960}}</ref>
+<ref name=SIMBAD>{{cite simbad | title=IQ Aur | access-date=2019-08-17 }}</ref>
 <ref name=Anderson2012>{{citation
@@ Line 62: / Line 69: @@
  | volume=38 | issue=5 | pages=331 | year=2012
  | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
- | arxiv=1108.4971 | postscript=. }}</ref>
+ | arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>
 <ref name=Samus2017>{{citation | postscript=.
@@ Line 70: / Line 77: @@
  | 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>
+ | doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869
+ }}</ref>
 <ref name=aaa334_181>{{citation
@@ Line 86: / Line 94: @@
  | 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>
+ | doi=10.1051/0004-6361/201116843 | s2cid=119245911 | postscript=. }}</ref>
 <ref name="Gontcharov">{{citation
@@ Line 94: / Line 102: @@
  | volume=32 | issue=11 | pages=759–771 | date=November 2006
  | bibcode=2006AstL...32..759G | arxiv=1606.08053
- | doi = 10.1134/S1063773706110065 | postscript=. }}</ref>
+ | doi = 10.1134/S1063773706110065 | s2cid=119231169
+ | postscript=. }}</ref>
 <ref name=aj74_375>{{citation | postscript=.
@@ Line 107: / Line 116: @@
  | last1=Mermilliod | first1=J.-C. | postscript=.
  | 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 }}</ref>
@@ Line 126: / Line 135: @@
 {{Stars of Auriga}}
 <!-- Properties -->
+{{DEFAULTSORT:IQ Aurigae}}
 [[Category:A-type main-sequence stars]]
-[[Category:Ap star]]
+[[Category:Ap stars]]
 [[Category:Alpha2 Canum Venaticorum variables]]
 [[Category:Astronomical X-ray sources]]
@@ Line 135: / Line 146: @@
 [[Category:Henry Draper Catalogue objects|034452]]
 [[Category:Hipparcos objects|024799]]
-[[Category:HR objects|1732]]
+[[Category:Bright Star Catalogue objects|1732]]
 [[Category:Objects with variable star designations|Aurigae, IQ]]

Observation data Epoch J2000 Equinox J2000
A light curve for IQ Aurigae from BRITE nanosatellites. Plotted from data published by Strassmeier et al. (2020),^[1] assuming a period of 2.463 days.
Constellation	Auriga
Right ascension	05^h 19^m 00.02846^s^[2]
Declination	+33° 44′ 54.2208″^[2]
Apparent magnitude (V)	5.38^[3]
Characteristics
Evolutionary stage	main sequence^[4]
Spectral type	A0pSi^[5]
U−B color index	−0.62^[6]
B−V color index	−0.167±0.004^[3]
Variable type	α² CVn^[7]
Astrometry

Radial velocity (R_v)	+28.6^[8] km/s
Proper motion (μ)	RA: +13.573^[2] mas/yr Dec.: −29.028^[2] mas/yr
Parallax (π)	7.0526 ± 0.1065 mas^[2]
Distance	462 ± 7 ly (142 ± 2 pc)
Absolute magnitude (M_V)	−0.42^[9]

Details^[9]

Mass	3.95±0.21 `M`_☉
Radius	2.6±0.4 `R`_☉
Luminosity	263 `L`_☉
Surface gravity (log g)	4.34±0.12 cgs
Temperature	14,454 K
Metallicity [Fe/H]	1.70^[10] dex
Rotation	2.4660 days
Rotational velocity (v sin i)	49 km/s
Age	6.3^[4] Myr

Other designations
IQ Aur, BD+33°1008, HD 34452, HIP 24799, HR 1732, SAO 57884^[11]
Database references
SIMBAD	data