| 词条 | Nu Cephei |
| 释义 |
| name = Nu Cephei }}{{Starbox observe | epoch = J2000.0 | constell = Cepheus | ra = {{RA|21|45|26.925}} | dec = {{DEC|+61|07|14.90}} | appmag_v = 4.289[3] {{nowrap|(4.25 - 4.35[4])}} }}{{Starbox character | class = A2Iab[3] | appmag_1_passband = U | appmag_1 = 4.94[6] | appmag_2_passband = B | appmag_2 = 4.81[6] | appmag_3_passband = J | appmag_3 = 3.14[6] | appmag_4_passband = K | appmag_4 = 2.85[6] | appmag_5_passband = | appmag_5 = | appmag_6_passband = | appmag_6 = | appmag_7_passband = | appmag_7 = | appmag_8_passband = | appmag_8 = | r-i = | v-r = | b-v = +0.518[3] | u-b = +0.119[3] | j-h = | j-k = | variable = Alpha Cygni[4] }}{{Starbox astrometry | radial_v = −25.90[13] | prop_mo_ra = −3.74 ± 0.13 | prop_mo_dec = −2.10 ± 0.12 | parallax = 0.48 | p_error = 0.14 | parallax_footnote = | dist_pc = 1,450[17] | absmag_v = −6.82[18] }}{{Starbox detail | source = | mass = 15.4[17] | radius = 137[17] | gravity = 1.35[3] | luminosity = 102,000[17] | temperature = 8,800[3] | metal = | rotation = | rotational_velocity = 15[3] | age = | age_myr = 8[25] }}{{Starbox catalog | names = 10 Cephei, HD 207260, HR 8334, SAO 19624, FK5 1572, BD+60°2288, HIP 107418 }}{{Starbox reference | Simbad=HD+207260 | ARICNS = }}{{Starbox end}} Nu Cephei (ν Cephei) is a class A2, fourth-magnitude supergiant star in the constellation Cepheus. It is a white pulsating α Cygni variable star located about 4,700 light-years from Earth. ν Cephei is a member of the Cepheus OB2 stellar association,[25] which includes stars such as μ Cephei and VV Cephei.[27] It began life as an approximately {{solar mass|20}}[17][25] star around eight million years ago. It has now exhausted its core hydrogen and expanded and cooled into a supergiant. Elemental abundance analyes indicate that it has not yet spent time as a red supergiant, which would have brought about convection of fusion products to the surface in a Dredge-up.[25] ν Cephei is currently about 15 times as massive as the sun, 190 times as large, and 100,000 times as luminous. Its large size and luminosity cause it to be somewhat unstable and produce irregular pulsations. This is a common feature of class A and B supergiants, which are grouped as α Cygni variable stars. The brightness changes by at most a tenth of a magnitude.[4] References1. ^1 2 3 4 5 6 7 {{cite journal|bibcode=2012A&A...543A..80F|arxiv=1207.0308|title=Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters|journal=Astronomy & Astrophysics|volume=543|pages=A80|author1=Firnstein|first1=M.|last2=Przybilla|first2=N.|year=2012|doi=10.1051/0004-6361/201219034}} Vizier catalog entry[1][2][3][4][5][6][7][8]2. ^1 2 3 {{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|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 3. ^1 2 3 4 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati|first1=J. R.|year=2002}} 4. ^1 {{cite journal|bibcode=2006AstL...32..759G|title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system|journal=Astronomy Letters|volume=32|issue=11|pages=759–771|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 }} 5. ^1 {{cite journal|bibcode=1999A&A...346..819V|title=Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants|journal=Astronomy and Astrophysics|volume=346|pages=819|author1=Verdugo|first1=E.|last2=Talavera|first2=A.|last3=Gómez De Castro|first3=A. I.|year=1999}} 6. ^1 2 3 4 {{cite journal|bibcode=2005BaltA..14...51Y|title=Spectral Analysis of 4 Lacertae and ν Cephei|journal=Baltic Astronomy|volume=14|pages=51|author1=Yüce|first1=Kutluay|year=2005}} 7. ^1 2 3 4 5 {{cite thesis |type=Ph.D. |last=Firnstein |first=Markus |date=2010 |title=Quantitative Spectroscopy of Galactic BA-Type Supergiants |publisher=Erlangen, Nürnberg, Univ}} 8. ^1 {{cite journal|bibcode=1978ApJS...38..309H|title=Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way|journal=Astrophysical Journal|volume=38|pages=309|author1=Humphreys|first1=R. M.|year=1978|doi=10.1086/190559}} }} External links{{Stars of Cepheus}} 9 : Bayer objects|Henry Draper Catalogue objects|A-type supergiants|Cepheus (constellation)|Alpha Cygni variables|Flamsteed objects|Hipparcos objects|HR objects|Durchmusterung objects |
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