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{{short description|Star in the constellation Eridanus}} |
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{{starbox short |
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{{Starbox begin |
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|constell= [[Eridanus (constellation)|Eridanus]] |
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|name= |
| name = [[Bayer designation|χ Eridani]]}} |
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{{Starbox observe |
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|type= G8IV <ref name=SIMBAD> SIMBAD, [http://simbak.cfa.harvard.edu/simbad/sim-basic?Ident=Chi+Eridani&submit=SIMBAD+search HD 11937] (accessed 11 September 2012) </ref> |
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| epoch = [[J2000.0]] |
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|ra= {{RA|01|55|57.47212}} <ref name=SIMBAD/> |
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| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) |
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|dec= {{DEC|-51|36|32.0325}} <ref name=SIMBAD/> |
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| constell = [[Eridanus (constellation)|Eridanus]] |
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| ra = {{RA|01|55|57.45606}}<ref name=GaiaDR2/> |
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| dec = {{DEC|−51|36|31.9736}}<ref name=GaiaDR2/> |
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| appmag_v = {{nowrap|3.70<ref name=Mermilliod1986/> / 10.7<ref name=Poveda1994/>}} |
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}} |
}} |
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{{Starbox character |
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'''Chi Eridani''' ('''χ Eri''') is a [[star]] in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. Its [[apparent magnitude]] is 3.70. |
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| class = G8IV<ref name=Torres2006/> or {{nowrap|G8IIIb CNIV}}<ref name=Houk1978/> |
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| u-b = +0.46<ref name=Mermilliod1986/> |
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| b-v = +0.85<ref name=Mermilliod1986/> |
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| r-i = |
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}} |
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{{Starbox astrometry |
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| radial_v = –6.30<ref name=Gontcharov2006/> |
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| prop_mo_ra = +682.281<ref name=GaiaDR2/> |
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| prop_mo_dec = −295.332<ref name=GaiaDR2/> |
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| parallax = 57.3774 |
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| p_error = 0.3291 |
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| parallax_footnote = <ref name=GaiaDR2/> |
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| absmag_v= {{nowrap|2.39 / 9.4}}<ref name=Poveda1994/> |
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}} |
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{{Starbox detail |
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| source = <ref name=Rains2020/> |
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| component1 = A |
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| mass = 1.58<ref name=Fuhrmann2012/> |
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| radius = {{Val|3.993|0.027}} |
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| luminosity = {{val|9.84|0.39}} |
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| temperature = {{Val|5115|49|fmt=commas}} |
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| gravity = {{Val|3.42|0.10}} |
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| metal_fe = {{Val|−0.18|0.07}} |
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| rotational_velocity = 4.50 |
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| age_myr = |
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}} |
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{{Starbox catalog |
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| names = {{odlist | B=χ Eri | FK5=68 | GJ=81 | HD=11937 | HIP=9007 | HR=566 | SAO=232573 }}<ref name=SIMBAD/> |
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}} |
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{{Starbox reference |
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|Simbad=chi+Eri |
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|ARICNS=00163|an=A |
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|ARICNS2=00164|an2=B |
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}} |
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{{Starbox end}} |
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'''χ Eridani''' (Latinised as '''Chi Eridani''') is a [[binary star]]<ref name=Eggleton2008/> system in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It is visible to the naked eye with an [[apparent visual magnitude]] of 3.70.<ref name=Mermilliod1986/> The distance to this system, as determined using the [[stellar parallax|parallax method]], is around 58 [[light year]]s.<ref name=GaiaDR2/> The pair had an [[angular separation]] of 5.0 [[arcsecond]]s as of 1994. This corresponds to a [[projected separation]] of around 128 [[Astronomical Unit|AU]].<ref name=Poveda1994/> |
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The primary component is an [[stellar evolution|evolving]] [[G-type star|G-type]] [[subgiant]] star with a [[stellar classification]] of G8 IV.<ref name=Torres2006/> It is about 1.6 times the mass of the Sun and has 4 times the Sun's radius.<ref name=Fuhrmann2012/> The star shines with 10 times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 5,115 K.<ref name=Rains2020/> Unusually for a star of this class, it shows a [[Photometry (astronomy)|photometric]] [[Variable star|variability]] of 0.04 in magnitude, which may be due to a previous mass transfer from the secondary companion, or else from an undiscovered third companion.<ref name=Fuhrmann2012/> |
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The companion is about 7 magnitudes fainter than the primary and may be the source of the [[X-ray astronomy|X |
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-ray emission]] from this system. This emission has a luminosity of {{Val|504.4e27|u=erg s<sup>−1</sup>}}.<ref name=Fuhrmann2012/> |
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==References== |
==References== |
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{{reflist |
{{reflist|refs= |
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<ref name=GaiaDR2>{{Cite Gaia DR2|4937200425855463936}}</ref> |
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{{Stars of Eridanus}} |
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<ref name=Houk1978>{{cite book |
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[[Category:Eridanus (constellation)]] |
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| last1=Houk | first1=N. |
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| title=Michigan catalogue of two-dimensional spectral types for the HD stars |
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| volume=2 | date=1978 | publisher=Dept. of Astronomy, University of Michigan |
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| bibcode=1978mcts.book.....H }}</ref> |
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<ref name=Gontcharov2006>{{cite journal |
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| last1=Gontcharov | first1=G. A. |
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| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system |
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| journal=Astronomy Letters | volume=32| issue=11| pages=759–771| date=November 2006 |
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| doi=10.1134/S1063773706110065| bibcode=2006AstL...32..759G |
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| arxiv=1606.08053 | s2cid=119231169 |
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}}</ref> |
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<ref name=Rains2020>{{cite journal |
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| title=Precision angular diameters for 16 southern stars with VLTI/PIONIER |
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| display-authors=1 | last1=Rains | first1=Adam D. |
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| last2=Ireland | first2=Michael J. | last3=White | first3=Timothy R. |
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| last4=Casagrande | first4=Luca | last5=Karovicova | first5=I. |
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| journal=Monthly Notices of the Royal Astronomical Society |
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| volume=493 | issue=2 | pages=2377–2394 | date=April 2020 |
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| arxiv=2004.02343 | bibcode=2020MNRAS.493.2377R |
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| doi=10.1093/mnras/staa282 | doi-access=free }}</ref> |
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<ref name=Eggleton2008>{{citation |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| title=A catalogue of multiplicity among bright stellar systems |
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| journal=[[Monthly Notices of the Royal Astronomical Society]] |
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| volume=389 | issue=2 | pages=869–879 | date=September 2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E |
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| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref> |
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<ref name=Torres2006>{{citation |
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| display-authors=1 |
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| last1=Torres | first1=C. A. O. | last2=Quast | first2=G. R. |
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| last3=Da Silva | first3=L. | last4=De La Reza | first4=R. |
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| last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M. |
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| title=Search for associations containing young stars (SACY). I. Sample and searching method |
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| journal=[[Astronomy and Astrophysics]] |
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| volume=460 | issue=3 | date=December 2006 | pages=695–708 |
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| doi=10.1051/0004-6361:20065602 | bibcode=2006A&A...460..695T |
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| arxiv=astro-ph/0609258 | s2cid=16080025 | postscript=. }}</ref> |
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<ref name=Fuhrmann2012>{{citation |
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| last1=Fuhrmann | first1=K. | last2=Chini | first2=R. |
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| title=Multiplicity among F-type Stars |
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| journal=The Astrophysical Journal Supplement |
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| volume=203 | issue=2 | pages=20 | id=30 | date=2012 |
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| doi=10.1088/0067-0049/203/2/30 | bibcode=2012ApJS..203...30F |
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| postscript=. | doi-access=free }}</ref> |
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<ref name=Poveda1994>{{citation |
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| display-authors=1 | last1=Poveda | first1=A. |
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| last2=Herrera | first2=M. A. | last3=Allen | first3=C. |
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| last4=Cordero | first4=G. | last5=Lavalley | first5=C. |
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| title=Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems |
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| journal=Revista Mexicana de Astronomía y Astrofísica |
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| volume=28 | issue=1 | pages=43–89 | date=April 1994 |
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| bibcode=1994RMxAA..28...43P | postscript=. }} See pp. 58–59.</ref> |
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<ref name=Mermilliod1986>{{citation |
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| last1=Mermilliod | first1=J.-C. |
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| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) |
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| journal=Catalogue of Eggen's UBV Data |
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| publisher=[[SIMBAD]] | date=1986 | bibcode=1986EgUBV........0M |
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| postscript=. }}</ref> |
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<ref name=SIMBAD>{{cite simbad |
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| title=* chi Eri -- Pre-main sequence Star |
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| access-date=2016-10-27 | postscript=. }}</ref> |
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}} |
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{{Stars of Eridanus|state=collapsed}} |
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{{DEFAULTSORT:Chi Eridani}} |
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[[Category:G-type subgiants]] |
[[Category:G-type subgiants]] |
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[[Category:Binary stars]] |
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[[Category:Eridanus (constellation)]] |
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[[Category:Bayer objects|Eridani, Chi]] |
[[Category:Bayer objects|Eridani, Chi]] |
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[[Category:Durchmusterung objects]] |
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[[Category:Gliese and GJ objects|0081]] |
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{{Star-stub}} |
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[[Category:Henry Draper Catalogue objects|011937]] |
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[[Category:Hipparcos objects|009007]] |
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[[Category:Bright Star Catalogue objects|0566]] |
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Latest revision as of 19:01, 18 July 2024
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 01h 55m 57.45606s[1] |
| Declination | −51° 36′ 31.9736″[1] |
| Apparent magnitude (V) | 3.70[2] / 10.7[3] |
| Characteristics | |
| Spectral type | G8IV[4] or G8IIIb CNIV[5] |
| U−B color index | +0.46[2] |
| B−V color index | +0.85[2] |
| Astrometry | |
| Radial velocity (Rv) | –6.30[6] km/s |
| Proper motion (μ) | RA: +682.281[1] mas/yr Dec.: −295.332[1] mas/yr |
| Parallax (π) | 57.3774 ± 0.3291 mas[1] |
| Distance | 56.8 ± 0.3 ly (17.43 ± 0.10 pc) |
| Absolute magnitude (MV) | 2.39 / 9.4[3] |
| Details[7] | |
| A | |
| Mass | 1.58[8] M☉ |
| Radius | 3.993±0.027 R☉ |
| Luminosity | 9.84±0.39 L☉ |
| Surface gravity (log g) | 3.42±0.10 cgs |
| Temperature | 5,115±49 K |
| Metallicity [Fe/H] | −0.18±0.07 dex |
| Rotational velocity (v sin i) | 4.50 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | A |
| B | |
χ Eridani (Latinised as Chi Eridani) is a binary star[10] system in the constellation Eridanus. It is visible to the naked eye with an apparent visual magnitude of 3.70.[2] The distance to this system, as determined using the parallax method, is around 58 light years.[1] The pair had an angular separation of 5.0 arcseconds as of 1994. This corresponds to a projected separation of around 128 AU.[3]
The primary component is an evolving G-type subgiant star with a stellar classification of G8 IV.[4] It is about 1.6 times the mass of the Sun and has 4 times the Sun's radius.[8] The star shines with 10 times the solar luminosity from its outer atmosphere at an effective temperature of 5,115 K.[7] Unusually for a star of this class, it shows a photometric variability of 0.04 in magnitude, which may be due to a previous mass transfer from the secondary companion, or else from an undiscovered third companion.[8]
The companion is about 7 magnitudes fainter than the primary and may be the source of the X -ray emission from this system. This emission has a luminosity of 504.4×1027 erg s−1.[8]
References
[edit]- ^ 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.
- ^ a b c d 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 c Poveda, A.; et al. (April 1994), "Statistical studies of visual double and multiple stars. II. A catalogue of nearby wide binary and multiple systems", Revista Mexicana de Astronomía y Astrofísica, 28 (1): 43–89, Bibcode:1994RMxAA..28...43P. See pp. 58–59.
- ^ a b Torres, C. A. O.; et al. (December 2006), "Search for associations containing young stars (SACY). I. Sample and searching method", Astronomy and Astrophysics, 460 (3): 695–708, arXiv:astro-ph/0609258, Bibcode:2006A&A...460..695T, doi:10.1051/0004-6361:20065602, S2CID 16080025.
- ^ Houk, N. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 2. Dept. of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 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 Rains, Adam D.; et al. (April 2020). "Precision angular diameters for 16 southern stars with VLTI/PIONIER". Monthly Notices of the Royal Astronomical Society. 493 (2): 2377–2394. arXiv:2004.02343. Bibcode:2020MNRAS.493.2377R. doi:10.1093/mnras/staa282.
- ^ a b c d Fuhrmann, K.; Chini, R. (2012), "Multiplicity among F-type Stars", The Astrophysical Journal Supplement, 203 (2): 20, Bibcode:2012ApJS..203...30F, doi:10.1088/0067-0049/203/2/30, 30.
- ^ "* chi Eri -- Pre-main sequence Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-27.
{{cite web}}: CS1 maint: postscript (link) - ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
