“Lambda Leonis”的意思、由来-开放百科全书

Lambda Leonis (λ Leonis, abbreviated Lam Leo, λ Leo), also named Alterf,^[1] is a star in the constellation of Leo. The star is bright enough to be seen with the naked eye, having an apparent visual magnitude of 4.32^[3] Based upon an annual parallax shift of 0.00991 arcseconds, it is located about 329 light-years from the Sun.

Nomenclature

It bore the traditional name Alterf, from the Arabic الطرف aṭ-ṭarf "the view (of the lion)".{{cn|date=January 2018}} In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN)^[2] to catalogue and standardize proper names for stars. The WGSN approved the name Alterf for this star on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.^[1]

This star, along with Xi Cancri, were the Persian Nahn, "the Nose", and the Coptic Piautos, "the Eye", both lunar asterisms.^[23]

Properties

At that distance, the visual magnitude of the star is reduced by an interstellar absorption factor of 0.06 because of extinction.^[7]

This is a K-type giant star with a stellar classification of K4.5 III.^[4] It is a suspected variable star with a reported magnitude range of 4.28−4.34.^[26] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is {{Val|4.12|0.05|u=mas}},^[27] which, at its estimated distance, equates to a physical radius of nearly 45 times the radius of the Sun.^[12] It shines with around 472 times the luminosity of the Sun,^[13] from an outer atmosphere that has an effective temperature of 3,900 K.^[14]

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. ^{{Cite web|url=https://www.iau.org/science/scientific_bodies/working_groups/280/|title=International Astronomical Union {{!}} IAU|website=www.iau.org|access-date=2017-04-01}}
3. ^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=. }}
4. ^¹{{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/Cancer*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=0-486-21079-0 | page=114 | postscript=. }}
5. ^¹²³⁴{{citation | last=McWilliam | first=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}
6. ^¹²{{citation | first1=P. | last1=Keenan | first2=R. | last2=McNeil | title = The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245–266 | date=October 1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 | postscript=. }}
7. ^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 | volume=430 | pages=165–186 | date=2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}
8. ^¹{{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | bibcode=1970CoAsi.239....1B | 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=3 | 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=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=. }}
12. ^¹{{citation | display-authors=1 | last1=Kazarovets | first1=E. V. | last2=Samus | first2=N. N. | last3=Durlevich | first3=O. V. | title=New Catalogue of Suspected Variable Stars. Supplement | version=1.0 | publisher=Information Bulletin on Variable Stars | volume=4655 | page=1 |date=December 1998 | bibcode=1998IBVS.4655....1K | postscript=. }}
13. ^¹²³⁴{{citation | last1=Mermilliod | first1=J.-C. | title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) | publisher=SIMBAD | date=1986 | bibcode=1986EgUBV........0M | postscript=. }}
14. ^¹{{cite simbad | title=* lam Leo | accessdate=2016-09-27 | postscript=. }}

词条	Lambda Leonis
释义	Nomenclature Properties References {{Starbox begin \| name=Lambda Leonis }}{{Starbox observe \| constell = Leo \| epoch = J2000.0 (ICRS) \| ra = {{RA\|09\|31\|43.22754}} \| dec = {{DEC\|+22\|58\|04.6904}} \| appmag_v = 4.32^[3] }}{{Starbox character \| class = K4.5 III^[4] \| b-v = +1.54^[3] \| u-b = +1.82^[3] \| variable = }}{{Starbox astrometry \| radial_v = {{Val\|24.27\|0.19}}^[7] \| prop_mo_ra = −20.17 \| prop_mo_dec = −39.47 \| parallax = 9.91 \| p_error = 0.18 \| parallax_footnote = \| absmag_v = −0.70^[11] }}{{Starbox detail \| mass = \| radius = 45^[12] \| luminosity = 472^[13] \| temperature = 3,900^[14] \| metal_fe = −0.29^[14] \| gravity = 1.60^[14] \| rotational_velocity = 8^[17] \| rotation = \| age_myr = }}{{Starbox catalog \| names = Alterf, λ Leo, 4 Leo, BD+23° 2107, HD 82308, HIP 46750, HR 3773, SAO 80885^[18] }}{{Starbox reference \|Simbad=lam+Leo }}{{Starbox end}} Lambda Leonis (λ Leonis, abbreviated Lam Leo, λ Leo), also named Alterf,^[1] is a star in the constellation of Leo. The star is bright enough to be seen with the naked eye, having an apparent visual magnitude of 4.32^[3] Based upon an annual parallax shift of 0.00991 arcseconds, it is located about 329 light-years from the Sun. Nomenclature λ Leonis (Latinised to Lambda Leonis) is the star's Bayer designation. It bore the traditional name Alterf, from the Arabic الطرف aṭ-ṭarf "the view (of the lion)".{{cn\|date=January 2018}} In 2016, the International Astronomical Union (IAU) organized a Working Group on Star Names (WGSN)^[2] to catalogue and standardize proper names for stars. The WGSN approved the name Alterf for this star on February 1, 2017 and it is now so included in the List of IAU-approved Star Names.^[1] This star, along with Xi Cancri, were the Persian Nahn, "the Nose", and the Coptic Piautos, "the Eye", both lunar asterisms.^[23] Properties At that distance, the visual magnitude of the star is reduced by an interstellar absorption factor of 0.06 because of extinction.^[7] This is a K-type giant star with a stellar classification of K4.5 III.^[4] It is a suspected variable star with a reported magnitude range of 4.28−4.34.^[26] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is {{Val\|4.12\|0.05\|u=mas}},^[27] which, at its estimated distance, equates to a physical radius of nearly 45 times the radius of the Sun.^[12] It shines with around 472 times the luminosity of the Sun,^[13] from an outer atmosphere that has an effective temperature of 3,900 K.^[14] 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. ^{{Cite web\|url=https://www.iau.org/science/scientific_bodies/working_groups/280/\|title=International Astronomical Union {{!}} IAU\|website=www.iau.org\|access-date=2017-04-01}} 3. ^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=. }} 4. ^¹{{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/Cancer.html \| accessdate=2010-12-12 \| edition=Reprint \| publisher=Dover Publications Inc \| location=New York, NY \| isbn=0-486-21079-0 \| page=114 \| postscript=. }} 5. ^¹²³⁴{{citation \| last=McWilliam \| first=Andrew \| title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances \| journal=Astrophysical Journal Supplement Series \| volume=74 \| pages=1075–1128 \|date=December 1990 \| doi=10.1086/191527 \| bibcode=1990ApJS...74.1075M \| postscript=. }} 6. ^¹²{{citation \| first1=P. \| last1=Keenan \| first2=R. \| last2=McNeil \| title = The Perkins catalog of revised MK types for the cooler stars \| journal=Astrophysical Journal Supplement Series \| volume=71 \| pages=245–266 \| date=October 1989 \| bibcode=1989ApJS...71..245K \| doi=10.1086/191373 \| postscript=. }} 7. ^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 \| volume=430 \| pages=165–186 \| date=2005 \| doi=10.1051/0004-6361:20041272 \| bibcode=2005A&A...430..165F \| arxiv=astro-ph/0409579 \| postscript=. }} 8. ^¹{{citation \| last1=Bernacca \| first1=P. L. \| last2=Perinotto \| first2=M. \| title=A catalogue of stellar rotational velocities \| journal=Contributi Osservatorio Astronomico di Padova in Asiago \| volume=239 \| issue=1 \| year=1970 \| bibcode=1970CoAsi.239....1B \| 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=3 \| 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=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=. }} 12. ^¹{{citation \| display-authors=1 \| last1=Kazarovets \| first1=E. V. \| last2=Samus \| first2=N. N. \| last3=Durlevich \| first3=O. V. \| title=New Catalogue of Suspected Variable Stars. Supplement \| version=1.0 \| publisher=Information Bulletin on Variable Stars \| volume=4655 \| page=1 \|date=December 1998 \| bibcode=1998IBVS.4655....1K \| postscript=. }} 13. ^¹²³⁴{{citation \| last1=Mermilliod \| first1=J.-C. \| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished) \| publisher=SIMBAD \| date=1986 \| bibcode=1986EgUBV........0M \| postscript=. }} 14. ^¹{{cite simbad \| title=* lam Leo \| accessdate=2016-09-27 \| postscript=. }} ^[3]^[4]^[5]^[6]^[7]^[8]^[9]^[10]^[11]^[12]^[13]^[14] }}{{Stars of Leo\|state=collapsed}} 10 : K-type giants\|Leo (constellation)\|Stars with proper names\|Bayer objects\|Flamsteed objects\|Hipparcos objects\|Suspected variables\|Henry Draper Catalogue objects\|HR objects\|Durchmusterung objects
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