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- References
{{For|other star systems with this Bayer designation|Tau Eridani}}{{DISPLAYTITLE:Tau9 Eridani}}{{Starbox begin
| name= τ9 Eridani
}}{{Starbox observe
| constell = Eridanus
| epoch = J2000.0 (ICRS)
| ra = {{RA|03|59|55.48381}}
| dec = {{DEC|−24|00|58.3798}}
| appmag_v = 4.63[3]
}}{{Starbox character
| class = {{nowrap|B9.5V Si}}[4]
| b-v = −0.13[3]
| u-b = −0.40[3]
| variable = α2 CVn[7]
}}{{Starbox astrometry
| radial_v = {{Val|25.5|0.5}}[8]
| prop_mo_ra = +12.12
| prop_mo_dec = +16.48
| parallax = 9.96
| p_error = 0.22
| parallax_footnote =
| absmag_v = −0.44[7]
}}{{Starbox orbit
| reference = [13]
| period_unitless = 5.9537 days
| axis =
| axis_unitless =
| eccentricity = 0.1
| periastron = 2417600.95 JD
| periarg = 151
| k1 = 37.6
}}{{Starbox detail
| component1 = τ9 Eri A
| mass = 3.26[14]
| radius = 3.26[14]
| luminosity = 166[16]
| temperature = 10,866[16]
| metal_fe =
| gravity = {{Val|4.11|0.11}}[18]
| rotational_velocity = 30[19]
| age_myr =
}}{{Starbox catalog
| names = τ9 Eridani, τ9 Eri, 36 Eridani, CD−24° 2022, FK5 2287, HD 25267, HIP 18673, HR 1240, SAO 169017.[20]
}}{{Starbox reference
|Simbad=tau09+Eri
}}{{Starbox end}}Tau9 Eridani (τ9 Eri) is a binary star in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 4.63.[3] The distance to this system can be estimated using the parallax method, which yields a value of roughly 327 light years.[3]This is a single-lined spectroscopic binary system with an orbital period of 5.9537 days and an eccentricity of 0.1.[13] The primary component, τ9 Eri A, is a magnetic chemically peculiar star[14] with a stellar classification of {{nowrap|B9.5V Si}},[4] indicating that it is a B-type main sequence star that shows abundance anomalies in its silicon absorption lines.[4] It is an Alpha² Canum Venaticorum variable[7] with a rotational periodicity of 5.954 days.[28] The averaged strength of the stellar effective magnetic field is {{Val|240.6|91.0|ul=G}}.[4] Tau9 Eridani A has an estimated 326%[14] the mass of the Sun and 3.1 times the Sun's radius.[18] It shines with 166[16] times the solar luminosity from a outer atmosphere at an effective temperature of 10,866 K.[16] The star is spinning with a projected rotational velocity of 30 km/s.[19] References1. ^1 2 {{citation | display-authors=1 | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 | date=July 2002 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | postscript=. }}
2. ^1 2 3 4 {{citation | display-authors=1 | last1=Shulyak | first1=D. | last2=Paladini | first2=C. | last3=Causi | first3=G. Li | last4=Perraut | first4=K. | last5=Kochukhov | first5=O. | title=Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities | journal=Monthly Notices of the Royal Astronomical Society | volume=443 | issue=2 | pages=1629–1642 | date=September 2014 | doi=10.1093/mnras/stu1259 | bibcode=2014MNRAS.443.1629S | arxiv=1406.6093 | postscript=. }}
3. ^1 2 3 4 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
4. ^1 {{citation | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | last1=De Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | journal=Astronomy & Astrophysics | volume=546 | pages=A61 | year=2012 | bibcode=2012A&A...546A..61D | doi=10.1051/0004-6361/201219219 | postscript=. |arxiv = 1208.3048 }}
5. ^1 2 {{citation | title=SB9: The ninth catalogue of spectroscopic binary orbits | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | journal=Astronomy and Astrophysics | volume=424 | issue=2 | pages=727–732 | year=2004 | doi=10.1051/0004-6361:20041213 | arxiv=astro-ph/0406573 | bibcode=2004A&A...424..727P | postscript=. }}
6. ^1 2 3 {{citation | title=Random forest automated supervised classification of Hipparcos periodic variable stars | journal=Monthly Notices of the Royal Astronomical Society | display-authors=1 | last1=Dubath |first1=P. | last2=Rimoldini | first2=L. | last3=Süveges | first3=M. | last4=Blomme | first4=J. | last5=López | first5=M. | last6=Sarro | first6=L. M. | last7=De Ridder | first7=J. | last8=Cuypers | first8=J. | last9=Guy | first9=L. | last10=Lecoeur | first10=I. | last11=Nienartowicz | first11=K. | last12=Jan | first12=A. | last13=Beck | first13=M. | last14=Mowlavi | first14=N. | last15=De Cat | first15=P. | last16=Lebzelter | first16=T. | last17=Eyer | first17=L. | volume=414 | issue=3 | pages=2602–2617 | year=2011 | bibcode=2011MNRAS.414.2602D | doi=10.1111/j.1365-2966.2011.18575.x | postscript=. |arxiv = 1101.2406 }}
7. ^1 2 3 4 {{citation | title=Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars | display-authors=1 | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. V. | last3=Madej | first3=J. | journal=Monthly Notices of the Royal Astronomical Society | volume=394 | issue=3 | pages=1338–1350 | date=April 2009 | doi=10.1111/j.1365-2966.2008.14227.x | bibcode=2009MNRAS.394.1338B | postscript=. }}
8. ^1 {{citation | title=A catalog of stellar magnetic rotational phase curves | display-authors=1 | last1=Bychkov | first1=V. D. | last2=Bychkova | first2=L. V. | last3=Madej | first3=J. | journal=Astronomy and Astrophysics | volume=430 | pages=1143–1154 | date=February 2005 | doi=10.1051/0004-6361:20034563 | bibcode=2005A&A...430.1143B | postscript=. }}
9. ^1 2 {{citation | last1=North | first1=P. | title=Do SI stars undergo any rotational braking? | journal=Astronomy and Astrophysics | volume=334 | pages=181–187 |date=June 1998 | bibcode=1998A&A...334..181N | arxiv=astro-ph/9802286 | postscript=. }}
10. ^1 2 3 4 5 {{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | publisher=SIMBAD | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}
11. ^1 {{cite simbad | title=tau09 Eri | accessdate=2016-10-13 | postscript=. }}
}}{{Stars of Eridanus|state=collapsed}} 11 : B-type main-sequence stars|Ap star|Eridanus (constellation)|Bayer objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Durchmusterung objects|Alpha2 Canum Venaticorum variables|Spectroscopic binaries |