| 词条 | HD 21389 |
| 释义 |
| image={{Location mark |image=Camelopardalis constellation map.svg|alt=|float=center|width=260 |label=|position=right |mark=Red circle.svg|mark_width=12|mark_link=CE Cam |x=852|y=853 }} |caption=Location of CE Camelopardalis (circled) }}{{Starbox observe | epoch=J2000 | ra={{RA|03|29|54.74413}}[1] | dec={{DEC|+58|52|43.4995}}[1] | appmag_v=4.54[3] | constell=Camelopardalis }}{{Starbox character | class=A0 Iae[1] | r-i = | v-r = | b-v = +0.56[5] | u-b = −0.11[5] | variable=α Cyg[2] }}{{Starbox astrometry | | radial_v=−6.20[3] | prop_mo_ra=1.79[1] | prop_mo_dec=−1.09[1] | parallax=1.30 | p_error=0.56 | parallax_footnote=[4] | dist_pc=975[5] | absmag_v=−7.20[5] }}{{Starbox detail | source=[1] | mass=19.3 | radius=97 | luminosity=55,000 | temperature=9,730 | metal= | gravity=1.75 | rotation=25 | age_myr=11[5] }}{{Starbox catalog | }}{{Starbox reference | | ARICNS = }}{{starbox sources|HIP|CCDM|HR}}{{Starbox end}} HD 21389 is a supergiant variable star in reflection nebula VdB 15, in the constellation Camelopardalis. It is part of the Camelopardalis OB1 association. The near-identical member CS Camelopardalis lies half a degree to the north. Since 1943, the spectrum of CE Cam has served as one of the stable anchor points by which other stars are classified. CE Camelopardalis is some 19 times as massive as the Sun and 55,000 timers as luminous. Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass 14.95 ± 0.41 times that and luminosity 62,679 times that of the Sun.[17] CE Cam is embedded in a large dusty molecular cloud, part of which it illuminates as a reflection nebula (vdB15 or BFS 29). This is a region of ongoing star formation with stars aged from one to a hundred million years old. CE Cam itself is thought to be around 11 million years old, long enough to have exhausted its core hydrogen and evolved away from the main sequence into a supergiant.[5] References1. ^1 2 {{cite journal|bibcode=2014MNRAS.438.1114S|title=An observational evaluation of magnetic confinement in the winds of BA supergiants|journal=Monthly Notices of the Royal Astronomical Society|volume=438|issue=2|pages=1114|author1=Shultz|first1=M.|last2=Wade|first2=G. A.|last3=Petit|first3=V.|last4=Grunhut|first4=J.|last5=Neiner|first5=C.|last6=Hanes|first6=D.|author7=MiMeS Collaboration|year=2014|doi=10.1093/mnras/stt2260|arxiv = 1311.5116 }} [6]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|display-authors=etal|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}} 3. ^{{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|author1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 }} 4. ^1 2 3 4 {{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F.|year=2007|doi=10.1051/0004-6361:20078357|arxiv = 0708.1752 }} 5. ^1 2 3 4 5 {{cite journal|bibcode=2001AJ....122.2634L|title=The Stars in Camelopardalis OB1: Their Distance and Evolutionary History|journal=The Astronomical Journal|volume=122|issue=5|pages=2634|author1=Lyder|first1=David A.|year=2001|doi=10.1086/323705}} 6. ^1 {{citation | last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F. | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | page=349 |date=April 2010 | doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H |arxiv = 1003.2335 }} }} External links
8 : Camelopardalis (constellation)|Alpha Cygni variables|Henry Draper Catalogue objects|Hipparcos objects|A-type supergiants|Objects with variable star designations|HR objects|Durchmusterung objects |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。