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{{Short description|Star in the constellation Leo}}
{{Starbox begin
{{Starbox begin
| name=Sigma Leonis
| name=Sigma Leonis
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| ra={{RA|11|21|08.1943}}<ref name=aaa323_L49/>
| ra={{RA|11|21|08.1943}}<ref name=aaa323_L49/>
| dec={{DEC|+06|01|45.558}}<ref name=aaa323_L49/>
| dec={{DEC|+06|01|45.558}}<ref name=aaa323_L49/>
| appmag_v=4.044<ref name=simbad/>
| appmag_v=4.046<ref name=Cousins1984/>
| constell=[[Leo (constellation)|Leo]]
| constell=[[Leo (constellation)|Leo]]
}}
}}
{{Starbox character
{{Starbox character
| class=B9.5Vs<ref name=simbad/>
| class=B9.5&nbsp;Vs<ref name=Chini2012/>
| b-v=–0.06<ref name=clpl4/>
| b-v=–0.06<ref name=clpl4/>
| u-b=–0.12<ref name=clpl4/>
| u-b=–0.12<ref name=clpl4/>
Line 22: Line 23:
| p_error=0.81
| p_error=0.81
| parallax_footnote=<ref name=aaa323_L49/>
| parallax_footnote=<ref name=aaa323_L49/>
| absmag_v=
| absmag_v= −0.10<ref name=Anderson2012/>
}}
}}
{{Starbox detail
{{Starbox detail
| mass=
| mass=2.76<ref name=David2015/>
| radius=3.3<ref name=mnras385_1_481/>
| radius=3.3<ref name=mnras385_1_481/>
| luminosity=
| luminosity=133<ref name=Anderson2012/>
| temperature=10,250<ref name=mnras385_1_481/>
| temperature=10,250<ref name=mnras385_1_481/>
| metal_fe=+0.0<ref name=mnras385_1_481/>
| metal_fe=+0.0<ref name=mnras385_1_481/>
| rotation=
| rotation=
| rotational_velocity=70<ref name=csrv/>
| rotational_velocity=70<ref name=csrv/>
| gravity=3.83 ± 0.03<ref name=aj129_3_1642/>
| gravity={{Val|3.83|0.03}}<ref name=aj129_3_1642/>
| age_myr=293<ref name=David2015/>
| age=
}}
}}
{{Starbox catalog
{{Starbox catalog
⚫
| names = {{odlist | B=σ&nbsp;Leo | F=77&nbsp;Leo | BD=−06°2437 | FK5=427 | HD=98664 | HIP=55434 | HR=4386 | SAO=118804 | GC=| LHS=}}<ref name=simbad>{{cite web | title=sig Leo -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Sigma+Leonis | accessdate=2010-06-23 }}</ref>
| names=77 Leo, [[Harvard Revised catalogue|HR]] 4386, [[Bonner Durchmusterung|BD]]+06 2437, [[Henry Draper catalogue|HD]] 98664, [[Smithsonian Astrophysical Observatory|SAO]] 118804, [[Fifth Fundamental Catalogue|FK5]] 427, [[Hipparcos catalogue|HIP]] 55434.<ref name=simbad/> }}
}}
{{Starbox reference
|Simbad=sig+Leo
}}
{{Starbox end}}
{{Starbox end}}


'''Sigma Leonis''', [[Latinisation of names|Latinized]] from '''σ Leonis''', is a blue-white hued [[star]] in the [[zodiac]] constellation [[Leo (constellation)|Leo]] that is visible to the naked eye with an [[apparent visual magnitude]] of 4.0.<ref name=Cousins1984/> Its annual [[stellar parallax|parallax shift]] of 15.24&nbsp;[[milliarcsecond|mas]] as seen from Earth implies a distance around 210&nbsp;[[light year]]s from the Sun. It is moving closer to the Sun with a [[radial velocity]] of –5&nbsp;km/s.<ref name=gcsrv53/>
'''Sigma Leonis''' ('''σ Leo''') is a blue-white 4th-[[Magnitude (astronomy)|magnitude]] [[star]] in the [[constellation]] [[Leo (constellation)|Leo]].


Chini et al. (2012) list this as a single-lined [[spectroscopic binary]] system.<ref name=Chini2012/> The visible component has a [[stellar classification]] of B9.5&nbsp;Vs,<ref name=Chini2012/> indicating it is a [[B-type main-sequence star]]. It is a suspected magnetic [[Ap star]] that shows an abundance anomaly with the element silicon.<ref name=Wraight2012/> Sigma Leonis has an estimated 2.76<ref name=David2015/> times the [[mass of the Sun]] and 3.3<ref name=mnras385_1_481/> times the [[Sun's radius]]. It is about 293<ref name=David2015/> million years old with a [[projected rotational velocity]] of 70&nbsp;km/s.<ref name=csrv/> The star is radiating 133<ref name=Anderson2012/> times the [[Sun's luminosity]] from its [[photosphere]] at an [[effective temperature]] of 10,250&nbsp;K.<ref name=mnras385_1_481/>
Sigma Leonis is of the [[spectral class]] B9.5Vs and has an [[apparent magnitude]] of +4.04.

==Name==

In [[Chinese astronomy|Chinese]], {{lang|zh|太微右垣}} ({{lang|zh-Latn|Tài Wēi Yòu Yuán}}), meaning ''[[Supreme Palace enclosure|Right Wall of Supreme Palace Enclosure]]'', refers to an asterism consisting of σ Leonis, [[Beta Virginis|β Virginis]], [[Iota Leonis|ι Leonis]], [[Theta Leonis|θ Leonis]] and [[Delta Leonis|δ Leonis]].<ref>{{in lang|zh}} ''中國星座神話'', written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.</ref> Consequently, the [[Chinese star names|Chinese name]] for σ Leonis itself is {{lang|zh|太微右垣二}} ({{lang|zh-Latn|Tài Wēi Yòu Yuán èr}}, {{langx|en|the Second Star of Right Wall of Supreme Palace Enclosure}}.),<ref>{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20100819122914/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm |date=2010-08-19 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> representing {{lang|zh|西上將}} ({{lang|zh-Latn|Xīshǎngjiāng}}), meaning ''The First Western General''.<ref>{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm#SupremePalaceEnclosure English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name] {{webarchive|url=https://web.archive.org/web/20080924022136/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm |date=2008-09-24 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.</ref> 西上將 (Xīshǎngjiāng), spelled Shang Tseang by R.H. Allen, means "the Higher General".<ref name=Allen1963>{{citation
| first1=Richard Hinckley | last1=Allen
| orig-year=1899 | year=1963 | edition=Dover
| title=Star Names, Their Lore and Meaning | chapter=Leo, the Lion
| chapter-url=https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Leo*.html
| accessdate=2017-08-23 | postscript=. }}</ref>


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


<ref name=aaa323_L49>{{cite journal | author=Perryman, M. A. C. |author2=et al. | title=The HIPPARCOS Catalogue | journal=Astronomy & Astrophysics | volume=323 | pages=L49–L52 |date=April 1997 | bibcode=1997A&A...323L..49P }}</ref>
<ref name=aaa323_L49>{{cite journal | author=Perryman, M. A. C. |display-authors=etal | title=The HIPPARCOS Catalogue | journal=Astronomy & Astrophysics | volume=323 | pages=L49–L52 |date=April 1997 | bibcode=1997A&A...323L..49P }}</ref>


<ref name=Cousins1984>{{citation
<ref name=gcsrv53>{{cite book | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953QB901.W495..... }}</ref>
| title=Standardisation of broad band photometry of equatorial standards
| journal=South Africa Astronomical Observatory Circular
| volume=8 | pages=59–67 | year=1984
| bibcode=1984SAAOC...8...59C | postscript=.
| last1=Cousins | first1=A. W. J. }}</ref>


<ref name=Wraight2012>{{citation
⚫
<ref name=clpl4>{{cite journal | author=Johnson, H. L.| author2=Iriarte, B.| author3=Mitchell, R. I.| author4=Wisniewskj, W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | bibcode=1966CoLPL...4...99J }}</ref>
| title=A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars
| last1=Wraight | first1=K. T. | last2=Fossati | first2=L.
| last3=Netopil | first3=M. | last4=Paunzen | first4=E.
| last5=Rode-Paunzen | first5=M. | last6=Bewsher | first6=D.
| last7=Norton | first7=A. J. | last8=White | first8=Glenn J.
| display-authors=1 | postscript=.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=420 | issue=1 | pages=757–772 | date=February 2012
| doi=10.1111/j.1365-2966.2011.20090.x | doi-access=free | bibcode=2012MNRAS.420..757W |arxiv = 1110.6283 | s2cid=14811051 }}</ref>


<ref name=Chini2012>{{citation
⚫
<ref name=csrv>{{cite journal | author=Bernacca, P. L.| author2=Perinotto, M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | date=1970 | bibcode=1970CoAsi.239....1B }}</ref>
| title=spectroscopic survey on the multiplicity of high-mass stars
| display-authors=1 | last1=Chini | first1=R.
| last2=Hoffmeister | first2=V. H. | last3=Nasseri | first3=A.
| last4=Stahl | first4=O. | last5=Zinnecker | first5=H.
| journal=Monthly Notices of the Royal Astronomical Society
| volume=424 | issue=3 | pages=1925–1929 | date=August 2012
| doi=10.1111/j.1365-2966.2012.21317.x | doi-access=free | bibcode=2012MNRAS.424.1925C | arxiv=1205.5238| s2cid=119120749 }}</ref>


<ref name=Anderson2012>{{citation
⚫
<ref name=simbad>{{cite web | title=sig Leo -- Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Sigma+Leonis | accessdate=2010-06-23 }}</ref>
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}</ref>


<ref name=David2015>{{citation
⚫
<ref name=mnras385_1_481>{{cite journal | author=Lipski, Ł.| author2=Stȩpień, K. | title=Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=385 | issue=1 | pages=481–492 |date=March 2008 | doi=10.1111/j.1365-2966.2008.12856.x | bibcode=2008MNRAS.385..481L |arxiv = 0712.3664 }}</ref>
| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.
| journal=The Astrophysical Journal
| volume=804 | issue=2 | pages=146 | year=2015
| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146
| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}</ref>


<ref name=aj129_3_1642>{{citation | last1=Fitzpatrick | first1=E. L. | last2=Massa | first2=D. | title=Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry | journal=The Astronomical Journal | volume=129 | issue=3 | pages=1642–1662 |date=March 2005 | doi=10.1086/427855 | bibcode=2005AJ....129.1642F |arxiv = astro-ph/0412542 }}</ref>
<ref name=gcsrv53>{{cite journal | last=Wilson | first=Ralph Elmer | date=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W }}</ref>

⚫
<ref name=clpl4>{{cite journal | author=Johnson, H. L.| author2=Iriarte, B.| author3=Mitchell, R. I.| author4=Wisniewskj, W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | page=99| bibcode=1966CoLPL...4...99J }}</ref>

⚫
<ref name=csrv>{{cite journal | author=Bernacca, P. L.| author2=Perinotto, M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | date=1970 | page=1 | bibcode=1970CoAsi.239....1B }}</ref>

⚫
<ref name=mnras385_1_481>{{cite journal | author=Lipski, Ł.| author2=Stȩpień, K. | title=Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=385 | issue=1 | pages=481–492 |date=March 2008 | doi=10.1111/j.1365-2966.2008.12856.x | doi-access=free | bibcode=2008MNRAS.385..481L |arxiv = 0712.3664 | s2cid=118320684 }}</ref>

<ref name=aj129_3_1642>{{citation | last1=Fitzpatrick | first1=E. L. | last2=Massa | first2=D. | title=Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry | journal=The Astronomical Journal | volume=129 | issue=3 | pages=1642–1662 |date=March 2005 | doi=10.1086/427855 | bibcode=2005AJ....129.1642F |arxiv = astro-ph/0412542 | s2cid=119512018 }}</ref>


}}
}}
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{{Stars of Leo}}
{{Stars of Leo}}


{{DEFAULTSORT:Sigma Leonis}}
[[Category:B-type main-sequence stars]]
[[Category:Bayer objects|Leonis, Sigma]]
[[Category:Bayer objects|Leonis, Sigma]]
[[Category:Leo (constellation)]]
[[Category:Leo (constellation)]]
[[Category:B-type main-sequence stars]]
[[Category:Durchmusterung objects]]
[[Category:Flamsteed objects|Leonis, 77]]

[[Category:Henry Draper Catalogue objects|098664]]

[[Category:Hipparcos objects|055434]]
{{Main-star-stub}}
[[Category:Bright Star Catalogue objects|4386]]

Latest revision as of 16:39, 26 October 2024

Sigma Leonis
Observation data
Epoch J2000      Equinox J2000
Constellation Leo
Right ascension 11h 21m 08.1943s[1]
Declination +06° 01′ 45.558″[1]
Apparent magnitude (V) 4.046[2]
Characteristics
Spectral type B9.5 Vs[3]
U−B color index –0.12[4]
B−V color index –0.06[4]
Astrometry
Radial velocity (Rv)–5.3[5] km/s
Proper motion (μ) RA: –91.76[1] mas/yr
Dec.: –12.83[1] mas/yr
Parallax (π)15.24 ± 0.81 mas[1]
Distance210 ± 10 ly
(66 ± 3 pc)
Absolute magnitude (MV)−0.10[6]
Details
Mass2.76[7] M☉
Radius3.3[8] R☉
Luminosity133[6] L☉
Surface gravity (log g)3.83±0.03[9] cgs
Temperature10,250[8] K
Metallicity [Fe/H]+0.0[8] dex
Rotational velocity (v sin i)70[10] km/s
Age293[7] Myr
Other designations
σ Leo, 77 Leo, BD−06°2437, FK5 427, HD 98664, HIP 55434, HR 4386, SAO 118804[11]
Database references
SIMBADdata

Sigma Leonis, Latinized from σ Leonis, is a blue-white hued star in the zodiac constellation Leo that is visible to the naked eye with an apparent visual magnitude of 4.0.[2] Its annual parallax shift of 15.24 mas as seen from Earth implies a distance around 210 light years from the Sun. It is moving closer to the Sun with a radial velocity of –5 km/s.[5]

Chini et al. (2012) list this as a single-lined spectroscopic binary system.[3] The visible component has a stellar classification of B9.5 Vs,[3] indicating it is a B-type main-sequence star. It is a suspected magnetic Ap star that shows an abundance anomaly with the element silicon.[12] Sigma Leonis has an estimated 2.76[7] times the mass of the Sun and 3.3[8] times the Sun's radius. It is about 293[7] million years old with a projected rotational velocity of 70 km/s.[10] The star is radiating 133[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,250 K.[8]

Name

[edit]

In Chinese, 太微右垣 (Tài Wēi Yòu Yuán), meaning Right Wall of Supreme Palace Enclosure, refers to an asterism consisting of σ Leonis, β Virginis, ι Leonis, θ Leonis and δ Leonis.[13] Consequently, the Chinese name for σ Leonis itself is 太微右垣二 (Tài Wēi Yòu Yuán èr, English: the Second Star of Right Wall of Supreme Palace Enclosure.),[14] representing 西上將 (Xīshǎngjiāng), meaning The First Western General.[15] 西上將 (Xīshǎngjiāng), spelled Shang Tseang by R.H. Allen, means "the Higher General".[16]

References

[edit]
  1. ^ a b c d e Perryman, M. A. C.; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49 – L52. Bibcode:1997A&A...323L..49P.
  2. ^ a b Cousins, A. W. J. (1984), "Standardisation of broad band photometry of equatorial standards", South Africa Astronomical Observatory Circular, 8: 59–67, Bibcode:1984SAAOC...8...59C.
  3. ^ a b c Chini, R.; et al. (August 2012), "spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925–1929, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x, S2CID 119120749
  4. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
  5. ^ a b Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode:1953GCRV..C......0W.
  6. ^ a b c 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.
  7. ^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  8. ^ a b c d e Lipski, Ł.; Stȩpień, K. (March 2008). "Effective temperatures of magnetic chemically peculiar stars from full spectral energy distributions". Monthly Notices of the Royal Astronomical Society. 385 (1): 481–492. arXiv:0712.3664. Bibcode:2008MNRAS.385..481L. doi:10.1111/j.1365-2966.2008.12856.x. S2CID 118320684.
  9. ^ Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542, Bibcode:2005AJ....129.1642F, doi:10.1086/427855, S2CID 119512018
  10. ^ a b Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago. 239 (1): 1. Bibcode:1970CoAsi.239....1B.
  11. ^ "sig Leo -- Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-23.
  12. ^ Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 420 (1): 757–772, arXiv:1110.6283, Bibcode:2012MNRAS.420..757W, doi:10.1111/j.1365-2966.2011.20090.x, S2CID 14811051.
  13. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  14. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2010-08-19 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  15. ^ (in Chinese) English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Archived 2008-09-24 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  16. ^ Allen, Richard Hinckley (1963) [1899], "Leo, the Lion", Star Names, Their Lore and Meaning (Dover ed.), retrieved 2017-08-23.
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