“31 Leonis”的意思、由来-开放百科全书

The primary member of 31 Leonis, component A, is an evolved K-type red giant^[22] with a stellar classification of {{nowrap|K3.5 IIIb Fe-1:}},^[4] where the suffix notation indicates an underabundance of iron in the spectrum. It has expanded to 30^[11] times the Solar radius and is radiating around 227^[11] times the Sun's luminosity from its photosphere at an effective temperature of 4,074 K.^[5] The magnitude 13.6 secondary, component B, lies at an angular separation of 7.9 arcseconds, as of 2008.^[18]

1. ^{{cite simbad | title=31 Leo | accessdate=2018-02-18 }}
2. ^¹²³{{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=. }}
3. ^¹{{citation | title=Hubble Space Telescope Constraints on the Winds and Astrospheres of Red Giant Stars | display-authors=1 | last1=Wood | first1=Brian E. | last2=Müller | first2=Hans-Reinhard | last3=Harper | first3=Graham M. | journal=The Astrophysical Journal | postscript=. | volume=829 | issue=2 | id=74 | pages=13 | date=October 2016 | doi=10.3847/0004-637X/829/2/74 | bibcode=2016ApJ...829...74W | arxiv=1607.07732}}
4. ^¹²{{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 | postscript=. | arxiv=0806.2878 }}
5. ^¹²³⁴⁵⁶{{citation | last1=Piau | first1=L. | last2=Kervella | first2=P. | last3=Dib | first3=S. | last4=Hauschildt | first4=P. | title=Surface convection and red-giant radius measurements | journal=Astronomy and Astrophysics | display-authors=1 | volume=526 | page=A100 | date=February 2011 | doi=10.1051/0004-6361/201014442 | bibcode=2011A&A...526A.100P | arxiv=1010.3649 | postscript=. }}
6. ^¹²{{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
7. ^¹²³⁴{{citation | postscript=. | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity | journal=The Astronomical Journal | display-authors=1 | volume=135 | issue=1 | pages=209–231 | date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M }}
8. ^¹²{{citation | postscript=. | last1=Keenan | first1=Philip C | last2=McNeil | first2=Raymond C | title=The Perkins catalog of revised MK types for the cooler stars | journal=Astrophysical Journal Supplement Series | volume=71 | pages=245 | year=1989 | bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}

词条	31 Leonis
释义	References {{Starbox begin \| name = 31 Leonis }}{{Starbox observe \| epoch= J2000.0 \| constell = Leo \| ra = {{RA\|10\|07\|54.27057}} \| dec = {{DEC\|+09\|59\|51.0230}} \| appmag_v = 4.39^[3] }}{{Starbox character \| class = {{nowrap\|K3.5 IIIb Fe-1:}}^[4] \| b-v = 1.447^[5] \| u-b = \| variable = }}{{Starbox astrometry \| radial_v = {{Val\|+39.84\|0.20}}^[6] \| prop_mo_ra = −128.69 \| prop_mo_dec = −113.60 \| parallax = 20.44 \| p_error = 1.68 \| parallax_footnote = \| absmag_v = −0.39^[3] }}{{Starbox detail \| source = \| mass = \| radius = {{Val\|30.40\|1.88}}^[11] \| luminosity_bolometric = {{Val\|227\|31}}^[11] \| temperature = {{Val\|4074\|8\|fmt=commas}}^[5] \| metal_fe = −0.02^[11] \| rotational_velocity = 5.1^[5] \| gravity = 1.81^[11] \| age_gyr = }}{{Starbox catalog \| names = {{odlist \| F=4 Equ \| BD=+10° 2112 \| HD=87837 \| HIP=49637 \| HR=3980 \| SAO=98964 }}^[1] }}{{Starbox reference \| Simbad=31+Leo }}{{Starbox end}}31 Leonis is a binary star^[18] system in the equatorial constellation of Leo. The system is visible to the naked eye in unresolved form, having a combined apparent visual magnitude of 4.39.^[3] An estimated distance of around 160 light years is obtained from the annual parallax shift of 20.44 mas as seen from Earth's orbit. It is moving away from the Sun with a radial velocity of +39.8 km/s.^[6] The primary member of 31 Leonis, component A, is an evolved K-type red giant^[22] with a stellar classification of {{nowrap\|K3.5 IIIb Fe-1:}},^[4] where the suffix notation indicates an underabundance of iron in the spectrum. It has expanded to 30^[11] times the Solar radius and is radiating around 227^[11] times the Sun's luminosity from its photosphere at an effective temperature of 4,074 K.^[5] The magnitude 13.6 secondary, component B, lies at an angular separation of 7.9 arcseconds, as of 2008.^[18] References 1. ^{{cite simbad \| title=31 Leo \| accessdate=2018-02-18 }} 2. ^¹²³{{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=. }} 3. ^¹{{citation \| title=Hubble Space Telescope Constraints on the Winds and Astrospheres of Red Giant Stars \| display-authors=1 \| last1=Wood \| first1=Brian E. \| last2=Müller \| first2=Hans-Reinhard \| last3=Harper \| first3=Graham M. \| journal=The Astrophysical Journal \| postscript=. \| volume=829 \| issue=2 \| id=74 \| pages=13 \| date=October 2016 \| doi=10.3847/0004-637X/829/2/74 \| bibcode=2016ApJ...829...74W \| arxiv=1607.07732}} 4. ^¹²{{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 \| postscript=. \| arxiv=0806.2878 }} 5. ^¹²³⁴⁵⁶{{citation \| last1=Piau \| first1=L. \| last2=Kervella \| first2=P. \| last3=Dib \| first3=S. \| last4=Hauschildt \| first4=P. \| title=Surface convection and red-giant radius measurements \| journal=Astronomy and Astrophysics \| display-authors=1 \| volume=526 \| page=A100 \| date=February 2011 \| doi=10.1051/0004-6361/201014442 \| bibcode=2011A&A...526A.100P \| arxiv=1010.3649 \| postscript=. }} 6. ^¹²{{citation \| last1=de Bruijne \| first1=J. H. J. \| last2=Eilers \| first2=A.-C. \| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project \| journal=Astronomy & Astrophysics \| volume=546 \| id=A61 \| pages=14 \| date=October 2012 \| doi=10.1051/0004-6361/201219219 \| bibcode=2012A&A...546A..61D \| arxiv=1208.3048 \| postscript=. }} 7. ^¹²³⁴{{citation \| postscript=. \| last1=Massarotti \| first1=Alessandro \| last2=Latham \| first2=David W. \| last3=Stefanik \| first3=Robert P. \| last4=Fogel \| first4=Jeffrey \| title=Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity \| journal=The Astronomical Journal \| display-authors=1 \| volume=135 \| issue=1 \| pages=209–231 \| date=January 2008 \| doi=10.1088/0004-6256/135/1/209 \| bibcode=2008AJ....135..209M }} 8. ^¹²{{citation \| postscript=. \| last1=Keenan \| first1=Philip C \| last2=McNeil \| first2=Raymond C \| title=The Perkins catalog of revised MK types for the cooler stars \| journal=Astrophysical Journal Supplement Series \| volume=71 \| pages=245 \| year=1989 \| bibcode=1989ApJS...71..245K \| doi=10.1086/191373 }} ^[2]^[3]^[4]^[5]^[6]^[7]^[8] }}{{Stars of Leo}} 9 : K-type giants\|Binary stars\|Leo (constellation)\|Flamsteed objects\|Bayer objects\|Durchmusterung objects\|Henry Draper Catalogue objects\|Hipparcos objects\|HR objects
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