Tau1 Eridani

{{short description|Binary star system in the constellation Eridanus}}

{{For|other star systems with this Bayer designation|Tau Eridani}}

{{Starbox begin

| name=τ¹ Eridani

}}

{{Starbox observe

| epoch=J2000

| constell=Eridanus{{cite constellation|90 Cet}}

| ra={{RA|02|45|06.18710}}

| dec={{DEC|−18|34|21.2149}}

| appmag_v=4.46

}}

{{Starbox character

| class=F7V{{Cite journal | doi = 10.1088/0067-0049/180/1/117| title = MK Classifications of Spectroscopic Binaries| journal = The Astrophysical Journal Supplement Series| volume = 180| issue = 1| pages = 117–118| year = 2009| last1 = Abt | first1 = H. A. | bibcode = 2009ApJS..180..117A| s2cid = 122811461}}

| b-v=+0.48

| u-b=+0.00

| variable=

}}

{{Starbox astrometry

| radial_v=+25.9

| prop_mo_ra=+334.20

| prop_mo_dec=+37.19

| parallax=70.32

| p_error=1.83

| parallax_footnote =

| absmag_v=+3.68

}}

{{Starbox orbit

| reference =

| primary =

| name =

| period =

| period_unitless = 958 d

| axis =

| axis_unitless =

| eccentricity = 0.45

| inclination =

| node =

| periastron = 39391.9

| periarg = 180

| periarg_primary =

| k1 =

| k2 =

}}

{{Starbox detail

| radius=1.325

| luminosity=2.572

| mass=1.15

| temperature=6,357

| gravity=4.34

| metal_fe={{nowrap|−0.08 ± 0.06}}

| age_gyr=

| rotation = {{val|3.847|ul=days}}

| rotational_velocity=28.02

}}

{{Starbox catalog

| names={{odlist | F=1 Eri | BD=−19°518 | FK5=2075 | GJ=111 | HD=17206 | HIP=12843 | HR=818 | SAO=11557 }}

}}

{{Starbox reference

| Simbad=tau01+Eri

}}

Tau¹ Eridani, Latinized from τ¹ Eridani, is a binary star system in the constellation Eridanus. It has an apparent magnitude of 4.46, making it visible to the naked eye in suitably dark conditions. This is a spectroscopic binary with an orbital period of 958 days. It is located about 46 light years from the Earth. At present, the system is moving away from the Sun with a radial velocity of +26 km/s. About 305,000 years ago, perihelion passage was made at an estimated distance of {{Convert|9.35|pc|ly|order=flip|abbr=on}}.{{citation

| last1=Bailer-Jones | first1=C. A. L.

| title=Close encounters of the stellar kind

| journal=Astronomy & Astrophysics

| volume=575 | id=A35 | pages=13 | date=March 2015

| doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B

| postscript=. |arxiv = 1412.3648 | s2cid=59039482

}}

Tau¹ Eridani was a latter designation of 90 Ceti.{{cite journal

| last=Wagman | first=M.

| title=Flamsteed's Missing Stars

| bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305| s2cid=118445625

}}

Debris disk

A moderate far-infrared excess was observed for this star system, in the 12μm, 25μm, 60μm and 100μm wavelengths, by the Infrared Astronomical Satellite (IRAS), and published in 1993. This discovery was subsequently interpreted as indicating a debris disk with a radius near 500 AU. It was further speculated that, if the star system had been observed at longer wavelengths, it was likely the debris disk would have been seen to have a radius considerably wider than 500 AU.

Later observations made by the Spitzer Space Telescope, published in 2004, detected no substantial infrared excess around the stars, within the 14-35μm range of wavelengths.

References

{{reflist|refs=

{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}

{{cite simbad

| title=* tau01 Eri

| accessdate=2015-04-15

| postscript=.

}}

{{citation

| first1=F. | last1=van Leeuwen

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664

| date=November 2007

| bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| arxiv=0708.1752

| s2cid=18759600

| postscript=.

}}

{{Citation |last1=Schofield |first1=Mathew |last2=Chaplin |first2=William J. |last3=Huber |first3=Daniel |last4=Campante |first4=Tiago L. |last5=Davies |first5=Guy R. |last6=Miglio |first6=Andrea |last7=Ball |first7=Warrick H. |last8=Appourchaux |first8=Thierry |last9=Basu |first9=Sarbani |last10=Bedding |first10=Timothy R. |last11=Christensen-Dalsgaard |first11=Jørgen |last12=Creevey |first12=Orlagh |last13=García |first13=Rafael A. |last14=Handberg |first14=Rasmus |last15=Kawaler |first15=Steven D. |date=2019-03-01 |title=The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite |bibcode=2019ApJS..241...12S |arxiv=1901.10148 |journal=The Astrophysical Journal Supplement Series |volume=241 |issue=1 |pages=12 |doi=10.3847/1538-4365/ab04f5 |doi-access=free |issn=0067-0049}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/ApJS/241/12&TIC=326242565 tau1 Eridani's database entry] at VizieR.

{{citation

| display-authors=1

| last1=Allende Prieto | first1=C.

| last2=Barklem | first2=P. S.

| last3=Lambert | first3=D. L.

| last4=Cunha | first4=K.

| title=S⁴N: A spectroscopic survey of stars in the solar neighborhood. The Nearest 15 pc

| journal=Astronomy and Astrophysics

| volume=420 | pages=183–205 | date=June 2004

| doi=10.1051/0004-6361:20035801 | bibcode=2004A&A...420..183A

| arxiv = astro-ph/0403108 | s2cid=14393039 | postscript=.

}}

[http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/420/183/table%5b235%5d&HIP=12843 Vizier catalog entry ]

{{citation

| display-authors=1

| last1=Nordström | first1=B.

| last2=Andersen | first2=J.

| last3=Holmberg | first3=J.

| last4=Jørgensen | first4=B. R.

| last5=Mayor | first5=M.

| last6=Pont | first6=F.

| title=The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs

| date=2004 | journal=Publications of the Astronomical Society of Australia

| volume=21 | issue=2 | pages=129–133

| doi=10.1071/AS04013 | bibcode=2004PASA...21..129N | postscript=.

| doi-access=free}}

{{citation

| display-authors=1

| last1=Martínez-Arnáiz

| first1=R.

| last2=Maldonado

| first2=J.

| last3=Montes

| first3=D.

| last4=Eiroa

| first4=C.

| last5=Montesinos

| first5=B.

| title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter

| journal=Astronomy and Astrophysics

| volume=520

| page=A79

| date=September 2010

| doi=10.1051/0004-6361/200913725

| bibcode=2010A&A...520A..79M

| arxiv=1002.4391

| s2cid=43455849

| postscript=.

| url=http://eprints.ucm.es/37826/1/davidmontes17libre.pdf

| access-date=2018-11-04

| archive-date=2017-09-22

| archive-url=https://web.archive.org/web/20170922031257/http://eprints.ucm.es/37826/1/davidmontes17libre.pdf

| url-status=dead

}}

{{citation

| last=Mermilliod | first=J.-C.

| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)

| journal=Catalogue of Eggen's UBV Data

| date=1986

| publisher=SIMBAD

| bibcode=1986EgUBV........0M

| postscript=.

}}

{{citation

| display-authors=1

| last1=Batten | first1=A. H.

| last2=Fletcher | first2=J. M.

| last3=Mann | first3=P. J.

| title=Seventh catalogue of the orbital elements of spectroscopic binary systems

| journal=Publications of the Dominion Astrophysical Observatory Victoria

| volume=15 | pages=121–295;150–151 | date=1978 | bibcode=1978PDAO...15..121B

| postscript=.

}}

{{citation

| display-authors=1

| last1=Tokovinin | first1=Andrei

| last2=Hartung | first2=Markus

| last3=Hayward | first3=Thomas L.

| last4=Makarov | first4=Valeri V.

| title=Revealing Companions to Nearby Stars with Astrometric Acceleration

| journal=The Astronomical Journal

| bibcode=2012AJ....144....7T | doi=10.1088/0004-6256/144/1/7

| arxiv=1204.4206 | s2cid=30955275 | postscript=.

}}

{{citation

| display-authors=1

| first1= Dana E | last1=Backman

| first2= Paresce| last2=Francesco

| title=Main-sequence stars with circumstellar solid material - The VEGA phenomenon

| journal=Protostars and planets III (A93-42937 17-90)

| pages=1253–1304

| date=1993

| bibcode=1993prpl.conf.1253B

| postscript=.

}}

{{Cite journal | doi = 10.1086/117107| title = A reinterpretation of millimeter observations of nearby IRAS excess stars| journal = The Astronomical Journal| volume = 108| pages = 701| year = 1994| last1 = Weintraub | first1 = D. A. | last2 = Stern | first2 = S. A.| display-authors=1 |bibcode = 1994AJ....108..701W | doi-access = free}}

{{Cite journal | doi = 10.1086/422975| title = Mid-Infrared Spectra of Dust Debris around Main-Sequence Stars| journal = The Astrophysical Journal Supplement Series| volume = 154| issue = 1| pages = 453–457| year = 2004| last1 = Jura | first1 = M.| last2 = Chen | first2 = C. H.| last3 = Furlan | first3 = E.| last4 = Green | first4 = J.| last5 = Sargent | first5 = B.| last6 = Forrest | first6 = W. J.| last7 = Watson | first7 = D. M.| last8 = Barry | first8 = D. J.| last9 = Hall | first9 = P.| last10 = Herter | first10 = T. L.| last11 = Houck | first11 = J. R.| last12 = Sloan | first12 = G. C.| last13 = Uchida | first13 = K.| last14 = d’Alessio | first14 = P.| last15 = Brandl | first15 = B. R.| last16 = Keller | first16 = L. D.| last17 = Kemper | first17 = F.| last18 = Morris | first18 = P.| last19 = Najita | first19 = J.| last20 = Calvet | first20 = N.| last21 = Hartmann | first21 = L.| last22 = Myers | first22 = P. C.| display-authors=1|arxiv = astro-ph/0405632 |bibcode = 2004ApJS..154..453J | s2cid = 396660}}

{{citation

| display-authors=1

| last1=Hempelmann | first1=A.

| last2=Mittag| first2=M.

| last3=Gonzalez-Perez| first3=J.

| last4=Schmitt| first4=J.

| last5=Schroder| first5=K.

| title=Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability

| journal=Astronomy and Astrophysics

| volume=586 | page=A14 | date=February 2016

| doi=10.1051/0004-6361/201526972| bibcode=2016A&A...586A..14H | doi-access=free

}}