Chi Eridani: Difference between revisions

χ Eridani
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Eridanus
Right ascension	01h 55m 57.45606s
Declination	−51° 36′ 31.9736″
Apparent magnitude (V)	3.70 / 10.7
Characteristics
Spectral type	G8IV or G8IIIb CNIV
U−B color index	+0.46
B−V color index	+0.85
Astrometry
Radial velocity (Rv)	–6.30 km/s
Proper motion (μ)	RA: +682.281 mas/yr ; Dec.: −295.332 mas/yr
Parallax (π)	57.3774 ± 0.3291 mas
Distance	56.8 ± 0.3 ly ; (17.43 ± 0.10 pc)
Absolute magnitude (MV)	2.39 / 9.4
Details
A
Mass	1.58 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
	χ Eri, FK5 68, GJ 81, HD 11937, HIP 9007, HR 566, SAO 232573
Database references
SIMBAD	data
ARICNS	A
	B

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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

^ ^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^ ^a ^b ^c ^d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.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.

[GaiaDR2-1] ^ ^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.

[Mermilliod1986-2] Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.

[Poveda1994-3] 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.

[Torres2006-4] 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.

[Houk1978-5] 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.

[Gontcharov2006-6] 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.

[Rains2020-7] 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.

[Fuhrmann2012-8] 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.

[SIMBAD-9] "* chi Eri -- Pre-main sequence Star". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-27.{{cite web}}: CS1 maint: postscript (link)

[Eggleton2008-10] 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.

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[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

@@ Line 6: / Line 6: @@
  | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
  | constell = [[Eridanus (constellation)|Eridanus]]
- | ra = {{RA|01|55|57.47212}}<ref name=vanLeeuwen2007/>
+ | ra = {{RA|01|55|57.45606}}<ref name=GaiaDR2/>
- | dec = {{DEC|−51|36|32.0325}}<ref name=vanLeeuwen2007/>
+ | dec = {{DEC|−51|36|31.9736}}<ref name=GaiaDR2/>
  | appmag_v = {{nowrap|3.70<ref name=Mermilliod1986/> / 10.7<ref name=Poveda1994/>}}
 }}
 {{Starbox character
- | class = G8IV<ref name=Torres2006/>
+ | class = G8IV<ref name=Torres2006/> or {{nowrap|G8IIIb CNIV}}<ref name=Houk1978/>
  | u-b = +0.46<ref name=Mermilliod1986/>
  | b-v = +0.85<ref name=Mermilliod1986/>
@@ Line 17: / Line 17: @@
 }}
 {{Starbox astrometry
- | radial_v =
+ | radial_v = –6.30<ref name=Gontcharov2006/>
- | prop_mo_ra = +680.92<ref name=vanLeeuwen2007/>
+ | prop_mo_ra = +682.281<ref name=GaiaDR2/>
- | prop_mo_dec = −283.46<ref name=vanLeeuwen2007/>
+ | prop_mo_dec = −295.332<ref name=GaiaDR2/>
- | parallax = 56.02
+ | parallax = 57.3774
- | p_error = 0.38
+ | p_error = 0.3291
- | parallax_footnote = <ref name=vanLeeuwen2007/>
+ | parallax_footnote = <ref name=GaiaDR2/>
  | absmag_v= {{nowrap|2.39 / 9.4}}<ref name=Poveda1994/>
 }}
 {{Starbox detail
- | source = <ref name=Fuhrmann2012/>
+ | source = <ref name=Rains2020/>
- | component1 = χ Eri A
+ | component1 = A
- | mass = 1.58
+ | mass = 1.58<ref name=Fuhrmann2012/>
- | radius = {{Val|4.06|0.16}}
+ | radius = {{Val|3.993|0.027}}
- | luminosity = 392<ref name=Mcdonald2012/>
+ | luminosity = {{val|9.84|0.39}}
- | temperature = {{Val|5135|80|fmt=commas}}
+ | temperature = {{Val|5115|49|fmt=commas}}
- | gravity = {{Val|3.42|-0.10}}
+ | gravity = {{Val|3.42|0.10}}
  | metal_fe = {{Val|−0.18|0.07}}
- | rotational_velocity = {{Val|2.0|1.0}}
+ | rotational_velocity = 4.50
  | age_myr =
 }}
 {{Starbox catalog
- | names = χ Eri, [[Catalogues of Fundamental Stars|FK5]] 68, [[Gliese Catalogue of Nearby Stars|GJ]] 81, [[Henry Draper Catalogue|HD]] 11937, [[Hipparcos Catalogue|HIP]] 9007, [[Bright Star Catalogue|HR]]&nbsp;566, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 232573.<ref name=SIMBAD/>
+ | names = {{odlist | B=χ Eri | FK5=68 | GJ=81 | HD=11937 | HIP=9007 | HR=566 | SAO=232573 }}<ref name=SIMBAD/>
 }}
 {{Starbox reference
@@ Line 46: / Line 46: @@
 }}
 {{Starbox end}}
-'''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&nbsp;[[light year]]s.<ref name=vanLeeuwen2007/> The pair had an [[angular separation]] of 5.0&nbsp;[[arcsecond]]s as of 1994. This corresponds to a [[projected separation]] of around 128&nbsp;[[Astronomical Unit|AU]].<ref name=Poveda1994/>
+'''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&nbsp;[[light year]]s.<ref name=GaiaDR2/> The pair had an [[angular separation]] of 5.0&nbsp;[[arcsecond]]s as of 1994. This corresponds to a [[projected separation]] of around 128&nbsp;[[Astronomical Unit|AU]].<ref name=Poveda1994/>
-The primary component is an [[stellar evolution|evolving]] [[G-type star|G-type]] [[subgiant]] star with a [[stellar classification]] of G8&nbsp;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 392<ref name=Mcdonald2012/> times the [[solar luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 5,135&nbsp;K.<ref name=Fuhrmann2012/> 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/>
+The primary component is an [[stellar evolution|evolving]] [[G-type star|G-type]] [[subgiant]] star with a [[stellar classification]] of G8&nbsp;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&nbsp;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/>
 The companion is about 7 magnitudes fainter than the primary and may be the source of the [[X-ray astronomy|X
@@ Line 56: / Line 57: @@
 {{reflist|refs=
+<ref name=GaiaDR2>{{Cite Gaia DR2|4937200425855463936}}</ref>
-<ref name=vanLeeuwen2007>{{citation
- | title=Validation of the new Hipparcos reduction
+<ref name=Houk1978>{{cite book
- | last1=van Leeuwen | first1=F.
+ | last1=Houk | first1=N.
- | journal=Astronomy and Astrophysics
+ | title=Michigan catalogue of two-dimensional spectral types for the HD stars
- | volume=474 | issue=2 | pages=653–664 | date=2007
+ | volume=2 | date=1978 | publisher=Dept. of Astronomy, University of Michigan
- | arxiv=0708.1752 | bibcode=2007A&A...474..653V
+ | bibcode=1978mcts.book.....H }}</ref>
- | doi=10.1051/0004-6361:20078357 | postscript=. }}</ref>
+<ref name=Gontcharov2006>{{cite journal
+ | last1=Gontcharov | first1=G. A.
+ | title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system
+ | journal=Astronomy Letters | volume=32| issue=11| pages=759–771| date=November 2006
+ | doi=10.1134/S1063773706110065| bibcode=2006AstL...32..759G
+ | arxiv=1606.08053 | s2cid=119231169
+ }}</ref>
+<ref name=Rains2020>{{cite journal
+ | title=Precision angular diameters for 16 southern stars with VLTI/PIONIER
+ | display-authors=1 | last1=Rains | first1=Adam D.
+ | last2=Ireland | first2=Michael J. | last3=White | first3=Timothy R.
+ | last4=Casagrande | first4=Luca | last5=Karovicova | first5=I.
+ | journal=Monthly Notices of the Royal Astronomical Society
+ | volume=493 | issue=2 | pages=2377–2394 | date=April 2020
+ | arxiv=2004.02343 | bibcode=2020MNRAS.493.2377R
+ | doi=10.1093/mnras/staa282 | doi-access=free }}</ref>
 <ref name=Eggleton2008>{{citation
@@ Line 69: / Line 88: @@
  | journal=[[Monthly Notices of the Royal Astronomical Society]]
  | volume=389 | issue=2 | pages=869–879 | date=September 2008
- | doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E
+ | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
- | arxiv=0806.2878 | postscript=. }}</ref>
+ | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}</ref>
 <ref name=Torres2006>{{citation
  | display-authors=1
- | last=Torres | first=C. A. O. | last2=Quast | first2=G. R.
+ | last1=Torres | first1=C. A. O. | last2=Quast | first2=G. R.
  | last3=Da Silva | first3=L. | last4=De La Reza | first4=R.
  | last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M.
@@ Line 81: / Line 100: @@
  | volume=460 | issue=3 | date=December 2006 | pages=695–708
  | doi=10.1051/0004-6361:20065602 | bibcode=2006A&A...460..695T
- | arxiv=astro-ph/0609258 | postscript=. }}</ref>
+ | arxiv=astro-ph/0609258 | s2cid=16080025 | postscript=. }}</ref>
 <ref name=Fuhrmann2012>{{citation
- | last=Fuhrmann | first=K. | last2=Chini | first2=R.
+ | last1=Fuhrmann | first1=K. | last2=Chini | first2=R.
  | title=Multiplicity among F-type Stars
  | journal=The Astrophysical Journal Supplement
  | volume=203 | issue=2 | pages=20 | id=30 | date=2012
  | doi=10.1088/0067-0049/203/2/30 | bibcode=2012ApJS..203...30F
- | postscript=. }}</ref>
+ | postscript=. | doi-access=free }}</ref>
-<ref name=Mcdonald2012>{{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=. }}</ref>
 <ref name=Poveda1994>{{citation
@@ Line 112: / Line 122: @@
  | last1=Mermilliod | first1=J.-C.
  | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
- | journal=Catalogue of Eggen's UBV data
+ | journal=Catalogue of Eggen's UBV Data
  | publisher=[[SIMBAD]] | date=1986 | bibcode=1986EgUBV........0M
  | postscript=. }}</ref>
@@ Line 118: / Line 128: @@
 <ref name=SIMBAD>{{cite simbad
  | title=* chi Eri -- Pre-main sequence Star
- | accessdate=2016-10-27 | postscript=. }}</ref>
+ | access-date=2016-10-27 | postscript=. }}</ref>
 }}
@@ Line 124: / Line 134: @@
 {{Stars of Eridanus|state=collapsed}}
+{{DEFAULTSORT:Chi Eridani}}
 [[Category:G-type subgiants]]
+[[Category:Binary stars]]
 [[Category:Eridanus (constellation)]]
 [[Category:Bayer objects|Eridani, Chi]]
+[[Category:Durchmusterung objects]]
+[[Category:Gliese and GJ objects|0081]]
 [[Category:Henry Draper Catalogue objects|011937]]
 [[Category:Hipparcos objects|009007]]
-[[Category:HR objects|0566]]
+[[Category:Bright Star Catalogue objects|0566]]
-[[Category:Binary stars]]
-[[Category:Gliese and GJ objects|0081]]
-[[Category:Durchmusterung objects]]

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Eridanus
Right ascension	01^h 55^m 57.45606^s^[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 (R_v)	–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 (M_V)	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
χ Eri, FK5 68, GJ 81, HD 11937, HIP 9007, HR 566, SAO 232573^[9]
Database references
SIMBAD	data
ARICNS	A
	B