IQ Aurigae: Difference between revisions
PopePompus (talk | contribs) Added a light curve |
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{{Short description| |
{{Short description|Star in the constellation Auriga}} |
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{{Starbox begin}} |
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{{Starbox image |
{{Starbox image |
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| epoch = J2000 |
| epoch = J2000 |
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| constell = [[Auriga (constellation)|Auriga]] |
| constell = [[Auriga (constellation)|Auriga]] |
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| ra = {{RA|05|19|00. |
| ra = {{RA|05|19|00.02846}}<ref name=GaiaDR3/> |
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| dec = {{DEC|+33|44|54. |
| dec = {{DEC|+33|44|54.2208}}<ref name=GaiaDR3/> |
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| appmag_v = 5.38<ref name=Anderson2012/> |
| appmag_v = 5.38<ref name=Anderson2012/> |
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}} |
}} |
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{{Starbox astrometry |
{{Starbox astrometry |
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| radial_v = +28.6<ref name="Gontcharov"/> |
| radial_v = +28.6<ref name="Gontcharov"/> |
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| prop_mo_ra = +13. |
| prop_mo_ra = +13.573<ref name=GaiaDR3/> |
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| prop_mo_dec = |
| prop_mo_dec = −29.028<ref name=GaiaDR3/> |
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| parallax = |
| parallax = 7.0526 |
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| p_error = 0. |
| p_error = 0.1065 |
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| parallax_footnote = <ref name= |
| parallax_footnote = <ref name=GaiaDR3/> |
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| absmag_v = |
| absmag_v = −0.42<ref name=aaa334_181/> |
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}} |
}} |
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{{Starbox detail |
{{Starbox detail |
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| temperature = 14,454 |
| temperature = 14,454 |
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| metal_fe = 1.70<ref name=aa_9_380/> |
| metal_fe = 1.70<ref name=aa_9_380/> |
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| gravity = {{ |
| gravity = {{val|4.34|0.12}} |
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| rotation = 2.4660 days |
| rotation = 2.4660 days |
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| rotational_velocity = 49 |
| rotational_velocity = 49 |
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}} |
}} |
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{{Starbox catalog |
{{Starbox catalog |
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| names = {{odlist | V=IQ Aur | BD=+33° |
| names = {{odlist | V=IQ Aur | BD=+33°1008 | HD=34452 | HIP=24799 | HR=1732 | SAO=57884 | AAVSO=0512+33 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
{{Starbox reference |
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'''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 |
'''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 [[light-year]]s from the Sun based on [[stellar parallax|parallax]] and is drifting further away with a [[radial velocity]] of +28.6 km/s.<ref name="Gontcharov"/> |
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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 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 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/> |
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{{reflist|refs= |
{{reflist|refs= |
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<ref name="Strassmeier">{{ |
<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> |
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<ref name= |
<ref name=GaiaDR3>{{cite Gaia DR3|181233674136088960}}</ref> |
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<ref name=SIMBAD>{{cite simbad | title=IQ Aur | access-date=2019-08-17 }}</ref> |
<ref name=SIMBAD>{{cite simbad | title=IQ Aur | access-date=2019-08-17 }}</ref> |
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[[Category:Henry Draper Catalogue objects|034452]] |
[[Category:Henry Draper Catalogue objects|034452]] |
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[[Category:Hipparcos objects|024799]] |
[[Category:Hipparcos objects|024799]] |
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[[Category: |
[[Category:Bright Star Catalogue objects|1732]] |
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[[Category:Objects with variable star designations|Aurigae, IQ]] |
[[Category:Objects with variable star designations|Aurigae, IQ]] |
Revision as of 19:00, 4 January 2024
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. | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 05h 19m 00.02846s[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 (Rv) | +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 (MV) | −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 | |
Database references | |
SIMBAD | data |
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.