“Sigma Hydrae”的意思、由来-开放百科全书

Sigma Hydrae (σ Hydrae, abbreviated Sigma Hya, σ Hya), also named Minchir,^[1] is a solitary^[18] star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.48.^[3] The estimated distance to this star from the Sun, based upon an annual parallax shift of 8.75 mas, is around 370 light-years. At that distance, the visual magnitude of the star is diminished by an interstellar extinction factor of 0.16,^[7] due to intervening dust.

Nomenclature

It bore the traditional name Minchir, appearing as Minchir es-schudscha' on Bode's large star atlas, Uranographia, which is derived from the Arabic Minkhir al-Shuja‘, "the Nostril of Hydra", for this star.{{citation needed|date=May 2017}} The name is erroneously{{citation needed|date=May 2017}} spelt as Al Minliar al Shuja in the Yale Bright Star Catalogue.^[2]. In 2016, the IAU organized a Working Group on Star Names (WGSN)^[3] to catalog and standardize proper names for stars. The WGSN approved the name Minchir for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.^[1]

This star, along with Delta Hydrae (Lisan al Shudja), Epsilon Hydrae, Zeta Hydrae, Eta Hydrae and Rho Hydrae, were Ulug Beg's Min al Azʽal, "Belonging to the Uninhabited Spot".^[4] (According to a 1971 NASA memorandum, Min al Azʽal or Minazal were the title for five stars : Delta Hydrae as Minazal I, Eta Hydrae as Minazal II, Epsilon Hydrae as Minazal III, Rho Hydrae as Minazal IV and Zeta Hydrae as Minazal V.^[26])

In Chinese, {{lang|zh|柳宿}} ({{lang|zh-Latn|Liǔ Sù}}), meaning Willow (asterism), refers to an asterism consisting of Sigma Hydrae, Delta Hydrae, Eta Hydrae, Rho Hydrae, Epsilon Hydrae, Zeta Hydrae, Omega Hydrae and Theta Hydrae.^[5] Consequently, Sigma Hydrae itself is known as {{lang|zh|柳宿二}} ({{lang|zh-Latn|Liǔ Sù èr}}, {{lang-en|the Second Star of Willow}}).^[6]

The people of Groote Eylandt, used the name Unwala ("The Crab") for the star cluster including this star, Delta Hydrae (Lisan al Shudja), Epsilon Hydrae, Zeta Hydrae, Eta Hydrae and Rho Hydrae.^[29]

Properties

This is an evolved K-type giant star with a stellar classification of K2 III.^[4] The measured angular diameter of this star, after correction for limb darkening, is {{Val|2.25|0.03|u=mas}}.^[31] At its estimated distance, this yields a physical size of about 27.6 times the radius of the Sun.^[13] It has about three times the mass of the Sun and radiates 295 times the solar luminosity from its outer atmosphere at an effective temperature of 4,491 K. Sigma Hydrae is around 430 million years old.^[12]

References

1. ^¹{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}}
2. ^
3. ^{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}}
4. ^{{cite book | last=Allen | first=R. H. | year=1963 | authorlink=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Hydra*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=0-486-21079-0 | page=249 }}
5. ^{{zh icon}} 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}}.
6. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 28 日
7. ^¹{{citation | 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 | postscript=. }}
8. ^¹{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | 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 | arxiv=0806.2878 | postscript=. }}
9. ^¹{{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | postscript=. }}
10. ^¹²{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}}. The radius (R_*) is given by::

11. ^¹²{{citation | display-authors=1 | last1=Prugniel | first1=Ph. | last2=Vauglin | first2=I. | last3=Koleva | first3=M. | title=The atmospheric parameters and spectral interpolator for the MILES stars | journal=Astronomy & Astrophysics | volume=531 | page=A165 |date=July 2011 | doi=10.1051/0004-6361/201116769 | bibcode=2011A&A...531A.165P | postscript=. | arxiv=1104.4952 }}
12. ^¹²{{citation | title=Abundances in the Local Region. I. G and K Giants | last1=Luck | first1=R. Earle | journal=The Astronomical Journal | volume=150 | issue=3 | id=88 | pages=23 | date=September 2015 | doi=10.1088/0004-6256/150/3/88 | bibcode=2015AJ....150...88L | arxiv=1507.01466 | postscript=. }}
13. ^¹²{{citation | author1=Houk | first1=N. | last2=Swift | first2=C. | title=Michigan catalogue of two-dimensional spectral types for the HD Stars | journal=Michigan Spectral Survey | postscript=. | volume=5 | year=1999 | bibcode=1999MSS...C05....0H }}
14. ^¹²{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | arxiv=astro-ph/0409579 | volume=430 | issue=1 | pages=165–186 | date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F }}
15. ^¹²³⁴{{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | year=1986 | publisher=SIMBAD | bibcode=1986EgUBV........0M | postscript=. }}
16. ^¹{{cite simbad | title=* sig Hya | accessdate=2017-01-08 | postscript=. }}
17. ^¹{{citation | url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf | first1=Jack W. | last1=Rhoads | title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars | publisher=Jet Propulsion Laboratory, California Institute of Technology | date=November 15, 1971 | accessdate=2017-01-09 | postscript=. }}
18. ^¹{{citation | title=Encyclopaedia of the history of science, technology, and medicine in non-western cultures | editor1-first=Helaine | editor1-last=Selin | editor-link1=Helaine Selin | publication-place=Dordrecht | publisher=Kluwer Academic Publishers | year=1997 | page=105 | postscript=. | url=https://books.google.com/books?id=raKRY3KQspsC&pg=PA105 }}

词条	Sigma Hydrae
释义	Nomenclature Properties References {{Starbox begin \| name = Sigma Hydrae }}{{Starbox observe \| epoch = J2000.0 \| equinox = J2000.0 (ICRS) \| constell = Hydra \| ra = {{RA\|08\|38\|45.43747}} \| dec = {{DEC\|+03\|20\|29.1701}} \| appmag_v = 4.48^[3] }}{{Starbox character \| class = K2 III^[4] \| b-v = +1.21^[3] \| u-b = +1.23^[3] \| r-i = \| variable = }}{{Starbox astrometry \| radial_v = {{Val\|27.28\|0.19}}^[7] \| prop_mo_ra = −19.48 \| prop_mo_dec = −15.92 \| parallax = 8.75 \| p_error = 0.25 \| parallax_footnote = \| absmag_v = −0.84^[11] }}{{Starbox detail \| source = ^[12] \| mass = 3.07 \| radius = 27.6^[13] \| luminosity = 295 \| temperature = {{Val\|4491\|51\|fmt=commas}} \| gravity = {{Val\|2.21\|0.13}}^[14] \| metal_fe = {{Val\|0.13\|0.06}}^[14] \| rotational_velocity = \| age_myr = 430 }}{{Starbox catalog \| names = σ Hya, 5 Hydrae, BD+03°2026, FK5 1224, HD 73471, HIP 42402, HR 3418, SAO 116988.^[16] }}{{Starbox reference \| Simbad = sig+Hya }}{{starbox end}} Sigma Hydrae (σ Hydrae, abbreviated Sigma Hya, σ Hya), also named Minchir,^[1] is a solitary^[18] star in the equatorial constellation of Hydra. It is visible to the naked eye with an apparent visual magnitude of 4.48.^[3] The estimated distance to this star from the Sun, based upon an annual parallax shift of 8.75 mas, is around 370 light-years. At that distance, the visual magnitude of the star is diminished by an interstellar extinction factor of 0.16,^[7] due to intervening dust. Nomenclature σ Hydrae (Latinised to Sigma Hydrae) is the system's Bayer designation. It bore the traditional name Minchir, appearing as Minchir es-schudscha' on Bode's large star atlas, Uranographia, which is derived from the Arabic Minkhir al-Shuja‘, "the Nostril of Hydra", for this star.{{citation needed\|date=May 2017}} The name is erroneously{{citation needed\|date=May 2017}} spelt as Al Minliar al Shuja in the Yale Bright Star Catalogue.^[2]. In 2016, the IAU organized a Working Group on Star Names (WGSN)^[3] to catalog and standardize proper names for stars. The WGSN approved the name Minchir for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.^[1] This star, along with Delta Hydrae (Lisan al Shudja), Epsilon Hydrae, Zeta Hydrae, Eta Hydrae and Rho Hydrae, were Ulug Beg's Min al Azʽal, "Belonging to the Uninhabited Spot".^[4] (According to a 1971 NASA memorandum, Min al Azʽal or Minazal were the title for five stars : Delta Hydrae as Minazal I, Eta Hydrae as Minazal II, Epsilon Hydrae as Minazal III, Rho Hydrae as Minazal IV and Zeta Hydrae as Minazal V.^[26]) In Chinese, {{lang\|zh\|柳宿}} ({{lang\|zh-Latn\|Liǔ Sù}}), meaning Willow (asterism), refers to an asterism consisting of Sigma Hydrae, Delta Hydrae, Eta Hydrae, Rho Hydrae, Epsilon Hydrae, Zeta Hydrae, Omega Hydrae and Theta Hydrae.^[5] Consequently, Sigma Hydrae itself is known as {{lang\|zh\|柳宿二}} ({{lang\|zh-Latn\|Liǔ Sù èr}}, {{lang-en\|the Second Star of Willow}}).^[6] The people of Groote Eylandt, used the name Unwala ("The Crab") for the star cluster including this star, Delta Hydrae (Lisan al Shudja), Epsilon Hydrae, Zeta Hydrae, Eta Hydrae and Rho Hydrae.^[29] Properties This is an evolved K-type giant star with a stellar classification of K2 III.^[4] The measured angular diameter of this star, after correction for limb darkening, is {{Val\|2.25\|0.03\|u=mas}}.^[31] At its estimated distance, this yields a physical size of about 27.6 times the radius of the Sun.^[13] It has about three times the mass of the Sun and radiates 295 times the solar luminosity from its outer atmosphere at an effective temperature of 4,491 K. Sigma Hydrae is around 430 million years old.^[12] References 1. ^¹{{cite web \| url=https://www.iau.org/public/themes/naming_stars/ \| title=Naming Stars \|publisher=IAU.org \|accessdate=16 December 2017}} 2. ^ 3. ^{{cite web \| url=https://www.iau.org/science/scientific_bodies/working_groups/280/ \| title=IAU Working Group on Star Names (WGSN)\|accessdate=22 May 2016}} 4. ^{{cite book \| last=Allen \| first=R. H. \| year=1963 \| authorlink=Richard Hinckley Allen \| title=Star Names: Their Lore and Meaning \| url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Hydra.html \| accessdate=2010-12-12 \| edition=Reprint \| publisher=Dover Publications Inc \| location=New York, NY \| isbn=0-486-21079-0 \| page=249 }} 5. ^{{zh icon}} 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}}. 6. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 28 日 7. ^¹{{citation \| 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 \| postscript=. }} 8. ^¹{{citation \| last1=Eggleton \| first1=P. P. \| last2=Tokovinin \| first2=A. A. \| title=A catalogue of multiplicity among bright stellar systems \| 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 \| arxiv=0806.2878 \| postscript=. }} 9. ^¹{{citation \| display-authors=1 \| last1=Richichi \| first1=A. \| last2=Percheron \| first2=I. \| last3=Khristoforova \| first3=M. \| title=CHARM2: An updated Catalog of High Angular Resolution Measurements \| journal=Astronomy and Astrophysics \| volume=431 \| issue=2 \| pages=773–777 \| date=February 2005 \| doi=10.1051/0004-6361:20042039 \| bibcode=2005A&A...431..773R \| postscript=. }} 10. ^¹²{{citation \| first1=Kenneth R. \| last1=Lang \| title=Astrophysical formulae \| volume=1 \| series=Astronomy and astrophysics library \| edition=3rd \| publisher=Birkhäuser \| date=2006 \| isbn=3-540-29692-1 \| url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}}. The radius (R_) is given by:: 11. ^¹²{{citation \| display-authors=1 \| last1=Prugniel \| first1=Ph. \| last2=Vauglin \| first2=I. \| last3=Koleva \| first3=M. \| title=The atmospheric parameters and spectral interpolator for the MILES stars \| journal=Astronomy & Astrophysics \| volume=531 \| page=A165 \|date=July 2011 \| doi=10.1051/0004-6361/201116769 \| bibcode=2011A&A...531A.165P \| postscript=. \| arxiv=1104.4952 }} 12. ^¹²{{citation \| title=Abundances in the Local Region. I. G and K Giants \| last1=Luck \| first1=R. Earle \| journal=The Astronomical Journal \| volume=150 \| issue=3 \| id=88 \| pages=23 \| date=September 2015 \| doi=10.1088/0004-6256/150/3/88 \| bibcode=2015AJ....150...88L \| arxiv=1507.01466 \| postscript=. }} 13. ^¹²{{citation \| author1=Houk \| first1=N. \| last2=Swift \| first2=C. \| title=Michigan catalogue of two-dimensional spectral types for the HD Stars \| journal=Michigan Spectral Survey \| postscript=. \| volume=5 \| year=1999 \| bibcode=1999MSS...C05....0H }} 14. ^¹²{{citation \| display-authors=1 \| last1=Famaey \| first1=B. \| last2=Jorissen \| first2=A. \| last3=Luri \| first3=X. \| last4=Mayor \| first4=M. \| last5=Udry \| first5=S. \| last6=Dejonghe \| first6=H. \| last7=Turon \| first7=C. \| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters \| journal=Astronomy and Astrophysics \| arxiv=astro-ph/0409579 \| volume=430 \| issue=1 \| pages=165–186 \| date=January 2005 \| doi=10.1051/0004-6361:20041272 \| bibcode=2005A&A...430..165F }} 15. ^¹²³⁴{{citation \| last1=Mermilliod \| first1=J.-C. \| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) \| year=1986 \| publisher=SIMBAD \| bibcode=1986EgUBV........0M \| postscript=. }} 16. ^¹{{cite simbad \| title=* sig Hya \| accessdate=2017-01-08 \| postscript=. }} 17. ^¹{{citation \| url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf \| first1=Jack W. \| last1=Rhoads \| title=Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars \| publisher=Jet Propulsion Laboratory, California Institute of Technology \| date=November 15, 1971 \| accessdate=2017-01-09 \| postscript=. }} 18. ^¹{{citation \| title=Encyclopaedia of the history of science, technology, and medicine in non-western cultures \| editor1-first=Helaine \| editor1-last=Selin \| editor-link1=Helaine Selin \| publication-place=Dordrecht \| publisher=Kluwer Academic Publishers \| year=1997 \| page=105 \| postscript=. \| url=https://books.google.com/books?id=raKRY3KQspsC&pg=PA105 }} ^[7]^[8]^[9]^[10]^[11]^[12]^[13]^[14]^[15]^[16]^[17]^[18] }}{{Stars of Hydra\|state=collapsed}} 9 : K-type giants\|Bayer objects\|Hydra (constellation)\|Stars with proper names\|Durchmusterung objects\|Flamsteed objects\|Henry Draper Catalogue objects\|Hipparcos objects\|HR objects
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