{{Short description|Star in the constellation Camelopardalis}} {{Starbox begin | name=HD 21389 }} {{Starbox image | 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|54.74360}}<ref name=dr3/> | dec={{DEC|+58|52|43.4969}}<ref name=dr3/> | appmag_v=4.54<ref name=schultz/> | constell=Camelopardalis }} {{Starbox character | class=A0 Iae<ref name=schultz/> | r-i = | v-r = | b-v = +0.56<ref name=lyder/> | u-b = −0.11<ref name=lyder/> | variable=α Cyg<ref name=gcvs/> |type=Blue supergiant}} {{Starbox astrometry | | radial_v=−6.20<ref name=pulkovo/> | prop_mo_ra=−2.247<ref name=dr3/> | prop_mo_dec=−0.657<ref name=dr3/> | parallax=0.9303 | p_error=0.1190 | parallax_footnote=<ref name=dr3/> | dist_pc= | absmag_v=−7.20<ref name=lyder/> }} {{Starbox detail | source=<ref name=schultz/> | mass=19.3 | radius=97 | luminosity=55,000 | temperature=9,730 | metal= | gravity=1.75 | rotational_velocity=25 | age_myr=11<ref name=lyder/> }} {{Starbox catalog | names=CE Camelopardalis, BD+58°607, HIP 16281, HR 1040, HD 21389, SAO 24061 }} {{Starbox reference | Simbad=HD+21389 | 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 has the variable star designation '''CE Camelopardalis''', abbreviated '''CE Cam'''. It is a magnitude 4.5 star, and is visible to the naked eye. This object 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.<ref name=baas25_1319/> In 1983, John R. Percy and Douglas L. Welch announced their discovery that HD 21389 is a variable star.<ref name="Percy1983"/> It was given its variable star designation in 1997.<ref name="Kazarovets1997"/>
CE Camelopardalis is some 19 times as massive as the Sun and 55,000 times as luminous. Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass {{val|14.95|0.41}} times that and luminosity 62,679 times that of the Sun.<ref name=an331_4_349/>
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.<ref name=lyder/>
{{gallery|mode=nolines|align=center |File:CECamLightCurve.png|A visual band light curve for CE Camelopardalis, adapted from Corliss ''et al.'' (2015)<ref name="Corliss"/> |File:519248main pia13459-43 full.jpg|CE Cam and the surrounding nebulosity at infrared wavelengths (Credit: NASA/JPL-Caltech/UCLA) }}
==References== <references> <ref name=dr3>{{cite Gaia DR3|450113435913489792}}</ref>
<ref name="Percy1983">{{cite journal |last1=Percy |first1=J. R. |last2=Welch |first2=D. L. |title=Photometric variability of B- and A-type supergiants |journal=Publications of the Astronomical Society of the Pacific |date=August 1983 |volume=95 |pages=491–505 |doi=10.1086/131198 |bibcode=1983PASP...95..491P |url=https://articles.adsabs.harvard.edu/pdf/1983PASP...95..491P |access-date=29 December 2024}}</ref>
<ref name="Kazarovets1997">{{cite journal |last1=Kazarovets |first1=E. V. |last2=Samus |first2=N. N. |title=The 73rd Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |bibcode=1997IBVS.4471....1K |date=April 1997 |volume=4471 |page=1 |url=https://ibvs.konkoly.hu/pub/ibvs/4401/4471.pdf |access-date=29 December 2024}}</ref>
<ref name=lyder>{{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=2634–2643|last1=Lyder|first1=David A.|year=2001|doi=10.1086/323705|doi-access=free}}</ref>
<ref name=pulkovo>{{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|last1=Gontcharov|first1=G. A.|year=2006|doi=10.1134/S1063773706110065|arxiv = 1606.08053 |s2cid=119231169}}</ref>
<ref name=gcvs>{{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|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
<ref name=schultz>{{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|last1=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|doi-access=free |arxiv = 1311.5116 |s2cid=118557626}}</ref>
<ref name="Corliss">{{cite journal |last1=Corliss |first1=David J. |last2=Morrison |first2=Nancy D. |last3=Adelman |first3=Saul J. |title=Spectroscopic and Photometric Variability in the A0 Supergiant HR 1040 |journal=The Astronomical Journal |date=December 2015 |volume=150 |issue=6 |page=190 |doi=10.1088/0004-6256/150/6/190 |s2cid=126051683 |doi-access=free|bibcode=2015AJ....150..190C }}</ref>
<ref name=baas25_1319>{{citation | last1=Garrison | first1=R. F. | title=Anchor Points for the MK System of Spectral Classification | journal=Bulletin of the American Astronomical Society | volume=25 | page=1319 | date=December 1993 | bibcode=1993AAS...183.1710G | url=http://www.astro.utoronto.ca/~garrison/mkstds.html | access-date=2012-02-04 | archive-date=2019-06-25 | archive-url=https://web.archive.org/web/20190625094716/http://www.astro.utoronto.ca/~garrison/mkstds.html | url-status=dead }}</ref>
<ref name=an331_4_349>{{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 | s2cid=111387483 }}</ref> </references>
==External links== * [http://aladin.u-strasbg.fr/AladinPreview?-c=03+29+54.7438%2B58+52+43.499&ident=V*+CE+Cam&submit=Aladin+previewer Image CE Camelopardalis] * [http://www.starrywonders.com/vdb14.html Starry Van Den Bergh 14 and 15]
{{Stars of Camelopardalis}}
Category:Camelopardalis Category:Alpha Cygni variables 021389 016281 Category:A-type supergiants Camelopardalis, CE 1040 Category:Durchmusterung objects Category:Emission-line stars