| 词条 | U Vulpeculae |
| 释义 |
| name = U Vulpeculae }}{{Starbox observe | epoch = J2000.0 | constell = Vulpecula | ra = {{RA|19|36|37.7281}}[1] | dec = {{DEC|20|19|58.5692}}[1] | appmag_v = 6.73 - 7.54[3] }}{{Starbox character | class = F6Iab-G2 | appmag_1_passband = | appmag_1 = | r-i = | v-r = | b-v = | u-b = | variable = δ Cep[3] }}{{Starbox astrometry | radial_v = | prop_mo_ra = {{val|0.906|0.050}}[1] | prop_mo_dec = {{val|−0.960|0.062}}[1] | parallax = 1.0530 | p_error = 0.0390 | parallax_footnote = [1] | absmag_v = -3.69[9] }}{{Starbox orbit | reference = [10] | period_unitless = 2,510 days | eccentricity = 0.675 | k1 = 3.64 | periastron = 2444800 | periarg = 353 }}{{Starbox detail | mass = 6.5[11] | radius = 60[11] | gravity = 1.75 - 1.85[13] | luminosity = | temperature = 5,655 - 5,965[13] | metal_fe = 0.09[15] | rotational_velocity = | age_myr = 82[15] }}{{Starbox catalog | names = {{odlist | BD=+20° 4200 | HD=185059 | HIP=96458 | HR=7458 | SAO=87447}}[17] }}{{Starbox reference | Simbad = U+Vulpeculae }}{{Starbox end}} U Vulpeculae is a variable and binary star in the constellation Vulpecula. It is a classical Cepheid variable and its apparent magnitude ranges from 6.73 to 7.54 over a precise cycle of 7.99 days. Its variable nature was discovered in 1898 at Potsdam Observatory by Gustav Müller and Paul Kempf.[19] In 1991 a study of radial velocities showed that it U Vulpeculae is a spectroscopic binary and a full orbit with a period of 2510 days (6.9 years) was first calculated in 1996.[20][11] The secondary star is invisible and is only known from its effect on the motion of the primary.[10] References1. ^1 2 3 4 5 {{cite DR2|1825621002188696448}} [1][2][3][4][5][6][7][8][9][10]2. ^1 2 3 {{cite journal | title=Cepheids and binarity. II. Radial velocities and spectroscopic orbits of four galactic Cepheids: RX Camelopardalis, MW Cygni, Z Lacertae and U Vulpeculae | url=http://articles.adsabs.harvard.edu/full/1996A%26AS..116..497I | language=French | last1=Imbert | first1=M. | journal=Astronomy and Astrophysics Supplement | volume=116 | pages=497–514 | year=1996 | bibcode=1996A&AS..116..497I }} 3. ^1 {{cite journal | title=Zwei neue Veränderliche von kurzer Periode | url=http://adsabs.harvard.edu/full/1898AN....146...37M | language=German | last1=Müller | first1=G. | last2=Kempf | first2=P. | journal=Astronomische Nachrichten | volume=146 | issue=3 | pages=37–42 | year=1898 | bibcode=1898AN....146...37M | doi=10.1002/asna.18981460303 }} 4. ^1 {{cite simbad |title=U Vulpeculae | accessdate=2 August 2015}} 5. ^1 {{cite journal | title=Northern Cepheids: Period Update and Duplicity Effects | url=http://articles.adsabs.harvard.edu/full/1991CoKon..96..123S | last1=Szabados | first1=L. | journal=Communications of the Konkoly Observatory | volume=11 part 3 | number=96 | pages=123–244 | year=1991 | bibcode=1991CoKon..96..123S }} 6. ^1 2 {{cite journal|bibcode=2009yCat....102025S|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|pages=B/gcvs|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 7. ^1 2 {{cite journal|bibcode=2013AstL...39..851M|title=Properties of the population of classical Cepheids in the Galaxy|journal=Astronomy Letters|volume=39|issue=12|pages=851|last1=Marsakov|first1=V. A.|last2=Koval'|first2=V. V.|last3=Kovtyukh|first3=V. V.|last4=Mishenina|first4=T. V.|year=2013}} 8. ^1 2 {{cite journal|bibcode=2013MNRAS.428.3252A|title=Barium abundances in Cepheids|journal=Monthly Notices of the Royal Astronomical Society|volume=428|issue=4|pages=3252|last1=Andrievsky|first1=S. M.|last2=Lépine|first2=J. R. D.|last3=Korotin|first3=S. A.|last4=Luck|first4=R. E.|last5=Kovtyukh|first5=V. V.|last6=MacIel|first6=W. J.|year=2013}} 9. ^1 {{cite journal|bibcode=2010MNRAS.408.1568K|title=Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios|journal=Monthly Notices of the Royal Astronomical Society|volume=408|issue=3|pages=1568|last1=Kovtyukh|first1=V. V.|last2=Chekhonadskikh|first2=F. A.|last3=Luck|first3=R. E.|last4=Soubiran|first4=C.|last5=Yasinskaya|first5=M. P.|last6=Belik|first6=S. I.|year=2010}} 10. ^1 2 {{cite journal|bibcode=2008A&A...488...25G|title=Baade-Wesselink distances and the effect of metallicity in classical cepheids|journal=Astronomy and Astrophysics|volume=488|issue=1|pages=25–35|last1=Groenewegen|first1=M. A. T.|year=2008|arxiv=0807.1269|doi=10.1051/0004-6361:200809859}} }}{{Stars of Vulpecula}} 9 : Vulpecula|Classical Cepheid variables|Objects with variable star designations|F-type supergiants|G-type supergiants|Durchmusterung objects|HR objects|Henry Draper Catalogue objects|Hipparcos objects |
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