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词条 Upsilon Librae
释义

  1. References

{{Starbox begin
| name = Upsilon Librae
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Libra
| ra = {{RA|15|37|01.45020}}
| dec = {{DEC|−28|08|06.2926}}
| appmag_v = 3.628[3]
}}{{Starbox character
| class = K3 III[4]
| b-v = +1.374[3]
| u-b = +1.586[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−24.9|0.7}}[7]
| prop_mo_ra = −12.82
| prop_mo_dec = −4.15
| parallax = 14.58
| p_error = 0.19
| parallax_footnote =
| absmag_v = −0.28[11]
}}{{Starbox detail
| source = [12]
| mass = 1.67
| radius = 31.5[13]
| luminosity = 309
| temperature = {{Val|4135|20|fmt=commas}}
| gravity = 1.58
| metal_fe = −0.02
| rotational_velocity =
| age_gyr = 3.14
}}{{Starbox catalog
| names = υ Lib, 39 Lib, CD−27° 10464, FK5 579, HD 139063, HIP 76470, HR 5794, SAO 183619.[14]
}}{{Starbox reference
| Simbad = ups+Lib
}}{{Starbox end}}Upsilon Librae (υ Lib, υ Librae) is the Bayer designation for a double star[15] in the zodiac constellation Libra. With an apparent visual magnitude of 3.628,[3] it is visible to the naked eye. The distance to this star, based upon an annual parallax shift of 14.58, is around 224 light years. It has a magnitude 10.8 companion at an angular separation of 2.0 arc seconds along a position angle of 151°, as of 2002.[18]

The brighter component is an evolved K-type giant star with a stellar classification of K3 III.[4] The measured angular diameter, after correction for limb darkening, is {{Val|4.27|0.05|u=mas}}.[20] At the estimated distance of the star, this yields a physical size of about 31.5 times the radius of the Sun.[13] It has 1.67 times the mass of the Sun and radiates 309 times the solar luminosity from its outer atmosphere at an effective temperature of 4,135 K.[12] The star is about three billion years old.[12]

References

1. ^1 {{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | year=2014 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 }}
2. ^1 {{citation | title=Comparing the Ca ii H and K Emission Lines in Red Giant Stars | postscript=. | display-authors=1 | last1=Ryon | first1=Jenna | last2=Shetrone | first2=Matthew D. | last3=Smith | first3=Graeme H. | journal=Publications of the Astronomical Society of the Pacific | volume=121 | issue=882 | page=842 | date=August 2009 | doi=10.1086/605456 | bibcode=2009PASP..121..842R |arxiv = 0907.3346 }}
3. ^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 | postscript=. | volume=431 | issue=2 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
4. ^1 2 {{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 | postscript=. | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}} The radius (R*) is given by::
5. ^1 2 {{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | publication-place=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}
6. ^1 2 3 4 {{citation | last1=Celis S. | first1=L. | title=Photoelectric photometry of late-type variable stars | journal=Astronomy and Astrophysics Supplement Series | volume=22 | pages=9–17 | date=October 1975 | bibcode=1975A&AS...22....9C | postscript=. }}
7. ^1 {{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=. }}
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 2 3 {{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=. }}
10. ^1 {{cite simbad | title=ups Lib | accessdate=2017-01-30 | postscript=. }}
[1][2][3][4][5][6][7][8][9][10]
}}{{Stars of Libra|state=collapsed}}

9 : K-type giants|Double stars|Libra (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects
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