delta Leporis
{{Short description|Star in the constellation Lepus}}
{{Starbox begin
| name = Delta Leporis
}}
{{Starbox observe
| epoch = J2000.0
| constell = Lepus
| dec = {{DEC|−20|52|44.7232}}
}}
{{Starbox character
| class = {{nowrap|K1 IV Fe−0.5}} or {{nowrap|K0 IIIb Fe−1.5 CH0.5}}
| variable =
}}
{{Starbox astrometry
| parallax = 28.68
| p_error = 0.17
}}
{{Starbox detail
| source =
| temperature = {{Val|4660|84|fmt=commas}}
| metal_fe = {{Val|−0.74|0.09}}
}}
{{Starbox catalog
| names = {{odlist | B= Lep | F=15 Lep | BD=−20° 1211 | FK5=222 | HD=39364 | HIP=27654 | HR=2035 | SAO=170926 | GC=7362 | LHS=1792 }}
}}
{{Starbox reference
| Simbad = del+Lep
}}
{{Starbox end}}
Delta Leporis which is latinized from δ Leporis is a solitary, orange-hued star in the southern constellation of Lepus. It is visible to the naked eye with an apparent visual magnitude of 3.85. Based upon an annual parallax shift of 28.68 mas, it is 114 light years distant from Earth.
This is an old, evolved K-type star with an age of about 10.7 billion years. Keenan and McNeil (1989) classified it as {{nowrap|K0 IIIb Fe−1.5 CH0.5}}, indicating it is a giant star showing a deficiency of iron and an excess of cyanogen in its atmosphere. However, Gray et al. (2006) listed it as {{nowrap|K1 IV Fe−0.5}}, which would suggest a less evolved subgiant star. It may be a red clump star, which indicates it is generating energy through helium fusion at its core.
The measured angular diameter of this star, after correction for limb darkening, is {{Val|2.63|0.04|u=mas}}. At the estimated distance of this star, this yields a physical size of about 10 times the radius of the Sun. It has only 94% of the Sun's mass and is radiating 46 times the Sun's luminosity from its photosphere at an effective temperature of 4,660 K.
References
{{reflist|refs=
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | date=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | postscript=.
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | s2cid=14878976 }}
| last1=Alves | first1=David R.
| title=K-Band Calibration of the Red Clump Luminosity
| journal=The Astrophysical Journal
| volume=539 | issue=2 | pages=732–741 | date=August 2000
| doi=10.1086/309278 | bibcode=2000ApJ...539..732A
| arxiv=astro-ph/0003329 | s2cid=16673121
| postscript=. }}
| last1=Uesugi | first1=Akira | last2=Fukuda | first2=Ichiro
| title=Catalogue of rotational velocities of the stars
| journal=Contributions from the Institute of Astrophysics and Kwasan Observatory
| date=1970 | publisher=University of Kyoto
| bibcode=1970crvs.book.....U | postscript=. }}
| display-authors=1 | last1=Richichi | first1=A.
| last2=Percheron | first2=I. | last3=Khristoforova | first3=M.
| title=CHARM2: An updated Catalog of High Angular Resolution Measurements
| journal=Astronomy and Astrophysics | postscript=.
| volume=431 | issue=2 | pages=773–777 | date=February 2005
| doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | doi-access=free }}
| first1=Kenneth R. | last1=Lang
| title=Astrophysical formulae | volume=1
| series=Astronomy and astrophysics library
| edition=3rd | publisher=Birkhäuser
| date=2006 | isbn=3-540-29692-1 | postscript=.
| url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41
}} The radius (R*) is given by:
:
& = \frac{(34.9\cdot 2.63\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 19.7\cdot R_{\bigodot}
\end{align}
| display-authors=1 | last1=Takeda | first1=Yoichi
| last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke
| title=Stellar Parameters and Elemental Abundances of Late-G Giants
| journal=Publications of the Astronomical Society of Japan
| date=August 2008 | volume=60 | issue=4 | pages=781–802
| bibcode=2008PASJ...60..781T | arxiv=0805.2434
| doi=10.1093/pasj/60.4.781 | s2cid=16258166 | postscript=. }}
| title=New atmospheric parameters and spectral interpolator for the MILES cool stars
| display-authors=1 | last1=Sharma | first1=Kaushal
| last2=Prugniel | first2=Philippe | last3=Singh | first3=Harinder P.
| journal =Astronomy & Astrophysics
| volume = 585 | id=A64 |pages= 27| year= 2016
| doi=10.1051/0004-6361/201526111 | bibcode=2016A&A...585A..64S
| arxiv=1512.04882 | s2cid=118576178 | postscript=. }}
| last1=Keenan | first1=Philip C. | last2=McNeil | first2=Raymond C.
| title=The Perkins catalog of revised MK types for the cooler stars
| journal=Astrophysical Journal Supplement Series
| volume=71 | pages=245 | year=1989 | postscript=.
| bibcode=1989ApJS...71..245K | doi=10.1086/191373 }}
| last1=Gontcharov | first1=G. A.
| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system
| journal=Astronomy Letters | postscript=.
| volume=32 | issue=11 | pages=759–771 | date=November 2006
| doi=10.1134/S1063773706110065 | bibcode=2006AstL...32..759G |arxiv = 1606.08053
| s2cid=119231169
}}
{{citation | display-authors=1
| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.
| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.
| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.
| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.
| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample
| journal=The Astronomical Journal
| volume=132 | issue=1 | pages=161–170 | date=July 2006
| doi=10.1086/504637 | bibcode=2006AJ....132..161G
| arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}
| title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system
| journal=CDS/ADC Collection of Electronic Catalogues
| last1=Ducati | first1=J. R.
| volume=2237 | date=2002 | postscript=.
| bibcode=2002yCat.2237....0D }}
| title=del Lep | accessdate=2017-08-18 | postscript=. }}
}}
{{Stars of Lepus|state=collapsed}}
{{DEFAULTSORT:Delta Leporis}}
Category:Horizontal-branch stars
Category:Lepus (constellation)