HD 124448

{{Starbox begin | name=HD 124448 }} {{Starbox image | image = [[Image:V821CenLightCurve.png|250px]] | caption = A [[light curve]] for V821 Centauri, plotted from ''[[Transiting Exoplanet Survey Satellite|TESS]]'' data. Adapted from Jeffery ''et al.'' (2020)<ref name=jeffery2020/> }} {{Starbox observe | epoch=J2000 | ra={{RA|14|14|58.6293}}<ref name = GaiaDR3/> | dec={{DEC|-46|17|19.294}}<ref name = GaiaDR3/> | appmag_v=9.94 - 10.03<ref name="gcvs"/> | constell=[[Centaurus]] }} {{Starbox character | class=B(p)<ref name=houk1978/> | variable=[[PV Telescopii variable|PV Tel]]?<ref name=gcvs/> }} {{Starbox astrometry | radial_v= | prop_mo_ra={{val|-6.544|0.038}} | prop_mo_dec={{val|-0.049|0.032}} | pm_footnote<ref name = GaiaDR3/> | parallax=0.6240 | p_error=0.0312 | parallax_footnote=<ref name = GaiaDR3/> | dist_ly= | dist_pc= | absmag_v= }} {{Starbox detail | mass=6.7<ref name=khalatyan2024/> | temperature=15,481<ref name=khalatyan2024/> | radius=5.2<ref name=GaiaDR3/> | luminosity=1,282<ref name=GaiaDR3/> | gravity=3.86<ref name=khalatyan2024/> | metal_fe=−0.55<ref name=khalatyan2024/> | age_myr= }} {{Starbox catalog | names= [[Variable star designation|V821]] Cen, [[Henry Draper Catalogue|HD]] 124448, [[Hipparcos catalogue|HIP]] 69619, [[2MASS]] J14145863-4617192<ref name = SIMBAD/> }} {{Starbox reference |Simbad = V821+Cen }} {{Starbox end}}

'''HD 124448''', also called '''Popper's Star''' and '''V821 Centauri''', is an [[extreme helium star]] in the [[Centaurus constellation]].<ref name=jeffery2020/> Discovered by astronomer [[Daniel M. Popper|Daniel Popper]], this [[star]] has a [[Stellar classification|spectral classification]] of B2-B3.<ref name=scheonberger1974/><ref name=popper1946/>

Peter M. Corben ''et al.'' announced that the star is a [[variable star]], in 1972.<ref name="Corben1972"/> It was given its [[variable star designation]], V821 Centauri, in 1981.<ref name="Kholopov1981"/>

== References == {{Reflist|refs=

<ref name=SIMBAD>{{Cite simbad|title = HD 124448|access-date = May 23, 2023}}</ref>

<ref name=khalatyan2024>{{cite journal |bibcode=2024A&A...691A..98K |title=Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost |last1=Khalatyan |first1=A. |last2=Anders |first2=F. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. A. |last5=Nepal |first5=S. |last6=Dal Ponte |first6=M. |last7=Jordi |first7=C. |last8=Guiglion |first8=G. |last9=Valentini |first9=M. |last10=Torralba Elipe |first10=G. |last11=Steinmetz |first11=M. |last12=Pantaleoni-González |first12=M. |last13=Malhotra |first13=S. |last14=Jiménez-Arranz |first14=Ó. |last15=Enke |first15=H. |last16=Casamiquela |first16=L. |last17=Ardèvol |first17=J. |journal=Astronomy and Astrophysics |date=2024 |volume=691 |pages=A98 |doi=10.1051/0004-6361/202451427 |arxiv=2407.06963 }}</ref>

<ref name=houk1978>{{cite journal |bibcode=1978mcts.book.....H |title=Michigan catalogue of two-dimensional spectral types for the HD stars |last1=Houk |first1=Nancy |journal=Ann Arbor: Dept. Of Astronomy |date=1978 }}</ref>

<ref name="Kholopov1981">{{cite journal |last1=Kholopov |first1=P. N. |last2=Samus |first2=N. N. |last3=Kukarkina |first3=N. P. |last4=Medvedeva |first4=G. I. |last5=Perova |first5=N. B. |title=65th Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |date=February 1981 |volume=1921 |pages=1–21 |bibcode=1981IBVS.1921....1K |url=https://ibvs.konkoly.hu/pub/ibvs/1901/1921.pdf |access-date=16 January 2025}}</ref>

<ref name="Corben1972">{{cite journal |last1=Corben |first1=P. M. |last2=Carter |first2=B. S. |last3=Banfield |first3=R. M. |last4=Harvey |first4=G. M. |title=UBV Photometry of 500 Southern Stars [erratum: 1973MNSSA..32...48C] |journal=Monthly Notes of the Astron. Soc. Southern Africa |date=1972 |volume=31 |pages=7–22 |bibcode=1972MNSSA..31....7C |url=https://ui.adsabs.harvard.edu/abs/1972MNSSA..31....7C/abstract |access-date=16 January 2025}}</ref>

<ref name="gcvs">{{cite web |title=V821 Cen |url=http://www.sai.msu.su/gcvs/cgi-bin/search2.cgi?search=V821+Cen |website=General Catalog of Variable Stars |publisher=Sternberg Astronomical Institute |access-date=24 May 2023}}</ref>

<ref name=jeffery2020>{{cite journal |bibcode=2020MNRAS.495L.135J |title=TESS photometry of extreme helium stars PV Tel and V821 Cen |last1=Jeffery |first1=C. Simon |last2=Barentsen |first2=Geert |last3=Handler |first3=Gerald |journal=Monthly Notices of the Royal Astronomical Society |year=2020 |volume=495 |issue=1 |pages=L135–L138 |doi=10.1093/mnrasl/slaa075 |doi-access=free |arxiv=2006.00946 }}</ref>

<ref name=scheonberger1974>{{cite journal |bibcode=1974A&A....37...87S |title=Fine analysis of Popper's star HD 124448 |last1=Schoenberner |first1=D. |last2=Wolf |first2=R. E. A. |journal=Astronomy and Astrophysics |year=1974 |volume=37 |page=87 }}</ref>

<ref name=popper1946>{{cite journal |bibcode=1946PASP...58..370P |title=The Spectrum of HD 124448. Second Note |last1=Popper |first1=Daniel M. |journal=Publications of the Astronomical Society of the Pacific |year=1946 |volume=58 |issue=345 |page=370 |doi=10.1086/125875 |s2cid=121599294 }}</ref>

}}

[[Category:Centaurus]] [[Category:B-type stars]] [[Category:PV Telescopii variables]] [[Category:Extreme helium star]] [[Category:Henry Draper Catalogue objects|124448]] [[Category:Objects with variable star designations|Centauri, V821]] [[Category:Hipparcos objects|069619]]