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{{Starbox begin
{{Starbox begin}}
| name=HD 130144
}}
{{Starbox observe
{{Starbox observe
| epoch=J2000
| epoch = J2000
| ra={{RA|14|46|05.94566}}<ref name="van Leeuwen2007"/>
| ra = {{RA|14|46|05.94566}}<ref name="van Leeuwen2007"/>
| dec={{DEC|+15|07|54.4332}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|+15|07|54.4332}}<ref name="van Leeuwen2007"/>
| appmag_v=5.82<ref name="MERMILLIOD"/>
| appmag_v = 5.78<ref name=Anderson_Francis_2012/> {{nowrap|(5.33 to 5.71)}}<ref name=Samus2017/>
| constell=[[Boötes (constellation)|Boötes]]
| constell = [[Boötes (constellation)|Boötes]]
}}
}}
{{Starbox character
{{Starbox character
| type =
| class=M5III<ref name=aa524_A57/>
| class = M5III<ref name=aa524_A57/>
| r-i =
| b-v = {{val|1.335|0.021}}<ref name=Anderson_Francis_2012/>
| v-r =
| b-v = +1.50<ref name="MERMILLIOD"/>
| u-b = +1.26<ref name="MERMILLIOD"/>
| u-b = +1.26<ref name="MERMILLIOD"/>
| variable = [[Slow irregular variable|Lb:]]<ref name=Samus2017/>
| variable=[[Slow irregular variable|Lb]]<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>


}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v={{val|-22.52|0.65}}<ref name="Famaey2009"/>
| radial_v = {{val|−22.52|0.65}}<ref name="Famaey2009"/>
| prop_mo_ra=−85.49<ref name="van Leeuwen2007"/>
| prop_mo_ra = −85.49<ref name="van Leeuwen2007"/>
| prop_mo_dec=+18.86<ref name="van Leeuwen2007"/>
| prop_mo_dec = +18.86<ref name="van Leeuwen2007"/>
| parallax=4.04
| parallax = 4.04
| p_error=0.38
| p_error = 0.38
| parallax_footnote=<ref name="van Leeuwen2007"/>
| parallax_footnote = <ref name="van Leeuwen2007"/>
| absmag_v=
| absmag_v = −1.17<ref name=Anderson_Francis_2012/>
}}
}}
{{Starbox detail
{{Starbox detail
| mass = {{val|3.1|0.5}}<ref name=aa524_A57/>
| mass=
| radius={{val|210|21}}<ref name=aa524_A57/>
| radius = {{val|210|21}}<ref name=aa524_A57/>
| luminosity=5,587<ref name=Mcdonald2012/>
| luminosity = 521.51<ref name=Anderson_Francis_2012/>
| temperature=3,333<ref name=Mcdonald2012/>
| temperature = 3,400<ref name=aa524_A57/>
| metal_fe=
| metal_fe =
| gravity=
| gravity =
| rotational_velocity=11<ref name=aa524_A57/>
| rotational_velocity = 8.5 or 11<ref name=aa524_A57/>
| age_gyr=
| age_gyr =
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=EK Boötis, [[Bonner Durchmusterung|BD]]+15° 2758, [[FK5]] 3168, [[Henry Draper Catalogue|HD]] 130144, [[Hipparcos Catalogue|HIP]] 72208, [[Bright Star Catalogue|HR]] 5512, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 101200.
| names = {{odlist | V=EK Boo | BD=+15° 2758 | FK5=3168 | HD=130144 | HIP=72208 | HR=5512 | SAO=101200 }}<ref name=SIMBAD/>
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+130144
| Simbad = EK+Boo
}}
}}
{{Starbox end}}
{{Starbox end}}


'''HD 130144''' (or '''EK Boötis''') is a [[semiregular variable star]] in the northern [[constellation]] of [[Boötes (constellation)|Boötes]]. The variation in luminosity has an amplitude of 0.38 in magnitude with no apparent periodicity. This is an [[X-ray astronomy|X-ray source]], and was possibly the first M-type giant star to have a [[Stellar magnetic field|magnetic field]] directly detected. It is considered to be a single star,<ref name=aa524_A57/> although there is nearby companion at an angular separation of 0.2023[[arc second|″]] along a [[position angle]] of 82.2° (as of 2010.4812).<ref name=Horch2011/>
'''HD 130144''' is a [[variable star]] in the northern [[constellation]] of [[Boötes (constellation)|Boötes]]. It has the [[variable star designation]] '''EK Boötis''' (or EK Boo), while ''HD 130144'' is the designation from the ''[[Henry Draper Catalogue]]''. The star is faintly visible to the naked eye with an [[apparent visual magnitude]] that ranges from 5.33 down to 5.71.<ref name=Samus2017/> [[Stellar parallax|Parallax]] measurements provide a distance estimate of approximately 810&nbsp;[[light year]]s from the [[Sun]]. It is drifting closer with a [[radial velocity]] of −23&nbsp;km/s.<ref name="Famaey2009"/>

This is an aging [[red giant star]] with a [[stellar classification]] of M5III.<ref name=aa524_A57/> It has an estimated 3.1 times the [[mass of the Sun]] and has expanded to around 210 times the [[Sun's radius]].<ref name=aa524_A57/> EK Boo is classified as a [[slow irregular variable]] that ranges in luminosity with an amplitude of 0.38 in magnitude and no apparent periodicity. This is an [[X-ray astronomy|X-ray source]], and was possibly the first M-type giant star to have a [[Stellar magnetic field|magnetic field]] directly detected. The strength of the field ranges from –0.1 to {{val|8|ul=G}}.<ref name=Renada_et_al_2009/>

HD 130144 has a high rotation rate for a star of this class, which may be the result of [[dredge-up]] of [[angular momentum]] from the interior, or else a merger with an orbiting companion.<ref name=Renada_et_al_2009/> It is considered to be a single star,<ref name=aa524_A57/> although there is nearby [[visual companion]] at an angular separation of {{val|0.20|u=arc second}} along a [[position angle]] of 82.2° (as of 2010.4812).<ref name=Horch2011/>


==References==
==References==
{{reflist|refs=
{{reflist|refs=

<ref name=SIMBAD>{{cite simbad
| title=EK Boo | access-date=2021-04-30 | postscript=. }}</ref>

<ref name=Anderson_Francis_2012>{{citation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| title=XHIP: An extended hipparcos compilation
| journal=Astronomy Letters | postscript=.
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>


<ref name="van Leeuwen2007">{{citation
<ref name="van Leeuwen2007">{{citation
| first=F. | last=van Leeuwen
| first=F. | last=van Leeuwen
| title=Validation of the new Hipparcos reduction
| title=Validation of the new Hipparcos reduction
| journal=Astronomy and Astrophysics
| journal=Astronomy and Astrophysics | postscript=.
| volume=474 | issue=2 | pages=653–664
| volume=474 | issue=2 | pages=653–664 | date=November 2007
| date=November 2007 | bibcode=2007A&A...474..653V
| bibcode=2007A&A...474..653V | s2cid=18759600
| doi=10.1051/0004-6361:20078357 | arxiv=0708.1752
| doi=10.1051/0004-6361:20078357 | arxiv=0708.1752 }}</ref>

| s2cid=18759600
<ref name=Samus2017>{{citation | postscript=.
}}</ref>
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=[[Astronomy Reports]]
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | s2cid=125853869
| doi=10.1134/S1063772917010085 }}</ref>

<ref name=Renada_et_al_2009>{{citation
| title=Dynamo-generated magnetic fields in fast rotating single giants
| first1=Renada | last1=Konstantinova-Antova
| first2=Michel | last2=Aurière
| first3=Klaus-Peter | last3=Schröder
| first4=Pascal | last4=Petit
| work=Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium
| volume=259 | pages=433–434 | date=April 2009
| doi=10.1017/S1743921309031020 | arxiv=0901.1537
| bibcode=2009IAUS..259..433K }}</ref>


<ref name="Famaey2009">{{citation
<ref name="Famaey2009">{{citation
| display-authors=1
| last1=Famaey | first1=B.
| last2=Pourbaix | first2=D.
| last3=Frankowski | first3=A.
| last4=Van Eck | first4=S.
| last5=Mayor | first5=M.
| last6=Udry | first6=S.
| last7=Jorissen | first7=H. A.
| title=Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations
| title=Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations
| display-authors=1 | last1=Famaey | first1=B.
| journal=Astronomy and Astrophysics
| last2=Pourbaix | first2=D. | last3=Frankowski | first3=A.
| last4=Van Eck | first4=S. | last5=Mayor | first5=M.
| last6=Udry | first6=S. | last7=Jorissen | first7=H. A.
| journal=Astronomy and Astrophysics | postscript=.
| volume=498 | issue=2 | pages=627–640 | year=2009
| volume=498 | issue=2 | pages=627–640 | year=2009
| arxiv=0901.0934
| arxiv=0901.0934 | bibcode=2009A&A...498..627F
| doi=10.1051/0004-6361/200810698 | s2cid=18739721 }}</ref>
| bibcode=2009A&A...498..627F
| doi=10.1051/0004-6361/200810698
| s2cid=18739721 }}</ref>


<ref name="MERMILLIOD">{{citation
<ref name="MERMILLIOD">{{citation
| last1=Mermilliod | first1=J.-C.
| last1=Mermilliod | first1=J.-C. | postscript=.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV Data. SIMBAD
| journal=Catalogue of Eggen's UBV Data. SIMBAD
| date=1986 | bibcode=1986EgUBV........0M
| date=1986 | bibcode=1986EgUBV........0M }}</ref>
}}</ref>

<ref name=Mcdonald2012>{{cite journal
| 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
| s2cid=118665352
}}</ref>


<ref name=Horch2011>{{citation
<ref name=Horch2011>{{citation
| display-authors=1
| last1=Horch, Elliott P.
| last2=Gomez, Shamilia C.
| last3=Sherry, William H.
| last4=Howell, Steve B.
| last5=Ciardi, David R.
| last6=Anderson, Lisa M.
| last7=van Altena, William F.
| title=Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June
| title=Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June
| display-authors=1 | last1=Horch | first1=Elliott P.
| journal=The Astronomical Journal
| volume=141 | issue=2 | id=45 | pages=13
| last2=Gomez | first2=Shamilia C. | last3=Sherry | first3=William H.
| last4=Howell | first4=Steve B. | last5=Ciardi | first5=David R.
| date=February 2011
| last6=Anderson | first6=Lisa M. | last7=van Altena | first7=William F.
| doi=10.1088/0004-6256/141/2/45
| journal=The Astronomical Journal | postscript=.
| bibcode=2011AJ....141...45H
| volume=141 | issue=2 | id=45 | pages=13 | date=February 2011
| url=http://authors.library.caltech.edu/22553/1/Horch2011p12763Astron_J.pdf
| doi=10.1088/0004-6256/141/2/45 | bibcode=2011AJ....141...45H
}}</ref>
| url=http://authors.library.caltech.edu/22553/1/Horch2011p12763Astron_J.pdf }}</ref>


<ref name=aa524_A57>{{citation
<ref name=aa524_A57>{{citation
| last1=Konstantinova-Antova | first1=R.
| last2=Aurière | first2=M.
| last3=Charbonnel | first3=C.
| last4=Drake | first4=N. A.
| last5=Schröder | first5=K.-P.
| last6=Stateva | first6=I.
| last7=Alecian | first7=E.
| last8=Petit | first8=P.
| last9=Cabanac | first9=R.
| title=Direct detection of a magnetic field in the photosphere of the single M giant EK Bootis. How common is magnetic activity among M giants?
| title=Direct detection of a magnetic field in the photosphere of the single M giant EK Bootis. How common is magnetic activity among M giants?
| display-authors=1 | last1=Konstantinova-Antova | first1=R.
| journal=Astronomy and Astrophysics
| last2=Aurière | first2=M. | last3=Charbonnel | first3=C.
| last4=Drake | first4=N. A. | last5=Schröder | first5=K.-P.
| last6=Stateva | first6=I. | last7=Alecian | first7=E.
| last8=Petit | first8=P. | last9=Cabanac | first9=R.
| journal=Astronomy and Astrophysics | postscript=.
| volume=524 | id=A57 | pages=9 | date=December 2010
| volume=524 | id=A57 | pages=9 | date=December 2010
| doi=10.1051/0004-6361/201014503
| doi=10.1051/0004-6361/201014503 | arxiv=1009.2001
| bibcode=2010A&A...524A..57K
| bibcode=2010A&A...524A..57K | s2cid=119184105 }}</ref>
|arxiv = 1009.2001 | s2cid=119184105
}}</ref>


}}
}}
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{{Stars of Boötes}}
{{Stars of Boötes}}


[[Category:Boötes]]
[[Category:M-type giants]]
[[Category:Slow irregular variables]]
[[Category:Slow irregular variables]]
[[Category:Boötes]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|130144]]
[[Category:Henry Draper Catalogue objects|130144]]
[[Category:Hipparcos objects|072208]]
[[Category:Hipparcos objects|072208]]
[[Category:M-type giants]]
[[Category:HR objects|5512]]
[[Category:HR objects|5512]]
[[Category:Objects with variable star designations|Boötis, EK]]
[[Category:Objects with variable star designations|Boötis, EK]]
[[Category:Durchmusterung objects]]


{{giant-star-stub}}
{{var-star-stub}}

Revision as of 14:46, 1 May 2021

HD 130144
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 46m 05.94566s[1]
Declination +15° 07′ 54.4332″[1]
Apparent magnitude (V) 5.78[2] (5.33 to 5.71)[3]
Characteristics
Spectral type M5III[4]
U−B color index +1.26[5]
B−V color index 1.335±0.021[2]
Variable type Lb:[3]
Astrometry
Radial velocity (Rv)−22.52±0.65[6] km/s
Proper motion (μ) RA: −85.49[1] mas/yr
Dec.: +18.86[1] mas/yr
Parallax (π)4.04 ± 0.38 mas[1]
Distance810 ± 80 ly
(250 ± 20 pc)
Absolute magnitude (MV)−1.17[2]
Details
Mass3.1±0.5[4] M☉
Radius210±21[4] R☉
Luminosity521.51[2] L☉
Temperature3,400[4] K
Rotational velocity (v sin i)8.5 or 11[4] km/s
Other designations
EK Boo, BD+15° 2758, FK5 3168, HD 130144, HIP 72208, HR 5512, SAO 101200[7]
Database references
SIMBADdata

HD 130144 is a variable star in the northern constellation of Boötes. It has the variable star designation EK Boötis (or EK Boo), while HD 130144 is the designation from the Henry Draper Catalogue. The star is faintly visible to the naked eye with an apparent visual magnitude that ranges from 5.33 down to 5.71.[3] Parallax measurements provide a distance estimate of approximately 810 light years from the Sun. It is drifting closer with a radial velocity of −23 km/s.[6]

This is an aging red giant star with a stellar classification of M5III.[4] It has an estimated 3.1 times the mass of the Sun and has expanded to around 210 times the Sun's radius.[4] EK Boo is classified as a slow irregular variable that ranges in luminosity with an amplitude of 0.38 in magnitude and no apparent periodicity. This is an X-ray source, and was possibly the first M-type giant star to have a magnetic field directly detected. The strength of the field ranges from –0.1 to 8 G.[8]

HD 130144 has a high rotation rate for a star of this class, which may be the result of dredge-up of angular momentum from the interior, or else a merger with an orbiting companion.[8] It is considered to be a single star,[4] although there is nearby visual companion at an angular separation of 0.20 arc second along a position angle of 82.2° (as of 2010.4812).[9]

References

  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c d 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.
  3. ^ a b c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  4. ^ a b c d e f g h Konstantinova-Antova, R.; et al. (December 2010), "Direct detection of a magnetic field in the photosphere of the single M giant EK Bootis. How common is magnetic activity among M giants?", Astronomy and Astrophysics, 524: 9, arXiv:1009.2001, Bibcode:2010A&A...524A..57K, doi:10.1051/0004-6361/201014503, S2CID 119184105, A57.
  5. ^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M.
  6. ^ a b Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698, S2CID 18739721.
  7. ^ "EK Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-04-30.{{cite web}}: CS1 maint: postscript (link)
  8. ^ a b Konstantinova-Antova, Renada; Aurière, Michel; Schröder, Klaus-Peter; Petit, Pascal (April 2009), "Dynamo-generated magnetic fields in fast rotating single giants", Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, vol. 259, pp. 433–434, arXiv:0901.1537, Bibcode:2009IAUS..259..433K, doi:10.1017/S1743921309031020
  9. ^ Horch, Elliott P.; et al. (February 2011), "Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June" (PDF), The Astronomical Journal, 141 (2): 13, Bibcode:2011AJ....141...45H, doi:10.1088/0004-6256/141/2/45, 45.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=HD_130144&oldid=1020871132"