| 词条 | Nu Herculis |
| 释义 |
|epoch=J2000 |constell=Hercules |ra={{RA|17|58|30.14909}}[1] |dec={{DEC|+30|11|21.3870}}[1] |appmag_v=4.38 - 4.48[3] }}{{Starbox character |class=F2II[2] {{nowrap|(kA9hF2mF2(IV)[3] + B9.5[4])}} |b-v=+0.35[5] |u-b=+0.13[5] |variable=SRd?[3] }}{{Starbox astrometry |radial_v=-22.30 ± 0.6[6] |prop_mo_ra=-0.81[1] |prop_mo_dec=2.18[1] |parallax=3.79 |p_error=0.39 |parallax_footnote=[1] |absmag_v=−2.67[7] }}{{Starbox detail |luminosity=799[8] |mass=5.31[16] |temperature=6410[9] |gravity=2.29[9] |metal_fe=−0.33[10] |rotational_velocity=28.0[8] |age_myr=200[8] }}{{Starbox catalog |names=ν Her, BD+30° 3093, HD 164136, HIP 87998, HR 6707, SAO 66524[11] }}{{Starbox reference|Simbad=nu+Her}}{{Starbox end}} Nu Herculis, Latinized from ν Herculis, is a binary and variable star in the constellation of Hercules. With an apparent magnitude of about 4.4, it is faintly visible to the naked eye. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 860 light years (260 parsecs). Nu Hercules is a binary with the two components separated by {{val|0.446|ul="}}. The secondary is nearly three magnitudes fainter than the primary at magnitude 7.5,[12] and is hotter than the primary with a spectral type of B9.5.[4] Nu Herculis's spectral type of F2 II means that it is an F-type bright giant, with a luminosity 799 times that of the Sun. Its effective temperature is 6,410 K, hotter than the Sun.[9] Its mass is about 5.3 solar masses.[9] It is a possible semiregular variable star with a range of about a tenth of a magnitude. A period of 29 days has been derived.[13] References1. ^1 2 3 4 {{cite journal|title=Validation of the new Hipparcos reduction|url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL|author1=van Leeuwen, F.|display-authors=etal|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|date=2007|arxiv=0708.1752|bibcode=2007A&A...474..653V|doi=10.1051/0004-6361:20078357}} {{Stars of Hercules}}2. ^{{cite journal|title=Revised Standards for Supergiants on the System of the Yerkes Spectral Atlas|author1=Morgan, W. W.|author2=Roman, Nancy G.|journal=Astrophysical Journal|volume=112|pages=362–364|bibcode=1950ApJ...112..362M|doi=10.1086/145351|date=1950}} 3. ^{{cite journal|bibcode=1989ApJS...69..301G|title=The Early F-Type Stars: Refined Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation|journal=The Astrophysical Journal Supplement Series|volume=69|pages=301|last1=Gray|first1=R. O.|last2=Garrison|first2=R. F.|year=1989}} 4. ^1 {{cite journal|bibcode=1998ApJS..119...83P|title=Ultraviolet and Optical Studies of Binaries with Luminous Cool Primaries and Hot Companions. V. The Entire IUE Sample|journal=The Astrophysical Journal Supplement Series|volume=119|issue=1|pages=83|last1=Parsons|first1=Sidney B.|last2=Ake|first2=Thomas B.|year=1998}} 5. ^1 {{cite journal|author1=Mermilliod, J.-C.|title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)|journal=Catalogue of Eggen's UBV Data|pages=0|url=http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1|date=1986|bibcode= 1986EgUBV........0M }} 6. ^{{cite journal|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|author=Gontcharov, G. A.|date=2006|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|bibcode=2006AstL...32..759G|doi=10.1134/S1063773706110065|arxiv=1606.08053}} 7. ^{{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 2 {{cite journal|bibcode=2003A&A...409..251M|title=Lithium and rotation in F and G dwarfs and subgiants|journal=Astronomy and Astrophysics|volume=409|pages=251–261|last1=Mallik|first1=Sushma V.|last2=Parthasarathy|first2=M.|last3=Pati|first3=A. K.|year=2003|doi=10.1051/0004-6361:20031084}} 9. ^1 2 3 4 {{cite journal|title=Lithium abundance in atmospheres of F- and G-type supergiants and bright giants|author1=Lyubimkov, Leonid S.|author2=Lambert, David L.|author3=Kaminsky, Bogdan M.|author4=Pavlenko, Yakov V.|author5=Poklad, Dmitry B.|author6=Rachkovskaya, Tamara M.|journal=Monthly Notices of the Royal Astronomical Society|volume=427|issue=1|pages=11–26|date=2012|bibcode=2012MNRAS.427...11L|doi=10.1111/j.1365-2966.2012.21617.x|arxiv=1212.6057}} 10. ^{{cite journal|title=Parameters and Abundances in Luminous Stars|author=Luck, R. Earle|journal=The Astronomical Journal|volume=147|issue=6|pages=137|date=2014|bibcode=2014AJ....147..137L|doi=10.1088/0004-6256/147/6/137}} 11. ^{{cite simbad|title=nu. Her|access-date=5 March 2017}} 12. ^{{cite journal|bibcode=1997HIP...C......0E}} 13. ^1 2 {{cite journal|bibcode=2009yCat....1.2025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/gcvs. Originally Published In: 2009yCat....102025S|volume=1|display-authors=etal|author1=Samus, N. N.|author2=Durlevich, O. V.|year=2009}} 9 : Hercules (constellation)|Bayer objects|F-type bright giants|Flamsteed objects|Hipparcos objects|Henry Draper Catalogue objects|HR objects|Durchmusterung objects|Semiregular variable stars |
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