- References
| name = Delta Mensae
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Mensa
| ra = {{RA|04|17|59.2718}}
| dec = {{DEC|−80|12|50.511}}
| appmag_v = 5.69[3]
}}{{Starbox character
| class = {{nowrap|K2/3 III + A9}}[4]
| b-v = +0.84[3]
| u-b = +0.53[3]
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−20.0|4.3}}[7]
| prop_mo_ra = +27.53
| prop_mo_dec = +61.56
| parallax = 7.70
| p_error = 0.27
| parallax_footnote =
| absmag_v = 0.34[11]
}}{{Starbox detail
| source =
| component1 = δ Men A
| mass =
| radius = 14[12]
| luminosity = 92[13]
| temperature = 5,183[11]
| gravity =
| metal_fe =
| rotational_velocity = < {{Val|4.7|0.2}}[11]
| age_gyr =
}}{{Starbox catalog
| names = {{odlist | B=δ Men | CP=−80° 116 | FK5=166 | HD=28525 | HIP=20049 | HR=1426 | SAO=258372 }}[16]
}}{{Starbox reference
| Simbad = del+Men
}}{{Starbox end}}
Delta Mensae (δ Mensae) is a binary star[17] system in the southern constellation of Mensa. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.69.[3] Based upon an annual parallax shift of 7.70 mas as seen from the Earth, it is 420 light years from the Sun.
The primary, designated component A, is a K-type giant star with a stellar classification of K2/3 III.[4] The measured angular diameter of this star is {{Val|1.00|0.01|u=mas}},[21] which, at the estimated distance of this system, yields a physical size of about 14 times the radius of the Sun.[12] The star is radiating 92[13] times the Sun's luminosity from its photosphere at an effective temperature of 5,183 K.[11] Its companion, component B, is an A-type star about 0.9 magnitudes fainter than the primary.[4]
References
1. ^1 2 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | doi=10.1111/j.1365-2966.2012.21873.x | arxiv=1208.2037 | postscript=. }}
2. ^1 {{citation | 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 }}
3. ^1 2 {{citation | 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::
4. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
5. ^1 2 3 4 {{citation | last1=Ammler-von Eiff | first1=M. | last2=Reiners | first2=A. | title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? | journal=Astronomy & Astrophysics | volume=542 | id=A116 | pages=31 | date=June 2012 | arxiv=1204.2459 | bibcode=2012A&A...542A.116A | doi=10.1051/0004-6361/201118724 | postscript=. }}
6. ^1 2 3 {{citation | last1=Parsons | first1=Sidney B. | last2=Ake | first2=Thomas B. | title=Ultraviolet and Optical Studies of Binaries with Luminous Cool Primaries and Hot Companions. V. The Entire IUE Sample | journal=The Astrophysical Journal Supplement Series | postscript=. | volume=119 | issue=1 | pages=83–104 |date=November 1998 | doi=10.1086/313152 | bibcode=1998ApJS..119...83P }}
7. ^1 {{citation | 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 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
8. ^1 2 3 4 {{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}
9. ^1 {{cite simbad | title=del Men | accessdate=2017-08-16 | postscript=. }}
[1][2][3][4][5][6][7][8][9]2. ^1 {{citation | 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 }}
3. ^1 2 {{citation | 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::
4. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
5. ^1 2 3 4 {{citation | last1=Ammler-von Eiff | first1=M. | last2=Reiners | first2=A. | title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? | journal=Astronomy & Astrophysics | volume=542 | id=A116 | pages=31 | date=June 2012 | arxiv=1204.2459 | bibcode=2012A&A...542A.116A | doi=10.1051/0004-6361/201118724 | postscript=. }}
6. ^1 2 3 {{citation | last1=Parsons | first1=Sidney B. | last2=Ake | first2=Thomas B. | title=Ultraviolet and Optical Studies of Binaries with Luminous Cool Primaries and Hot Companions. V. The Entire IUE Sample | journal=The Astrophysical Journal Supplement Series | postscript=. | volume=119 | issue=1 | pages=83–104 |date=November 1998 | doi=10.1086/313152 | bibcode=1998ApJS..119...83P }}
7. ^1 {{citation | 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 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
8. ^1 2 3 4 {{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}
9. ^1 {{cite simbad | title=del Men | accessdate=2017-08-16 | postscript=. }}
}}{{Stars of Mensa|state=collapsed}}{{Sky|04|17|59.1|-|80|12|50}}
9 : K-type giants|A-type stars|Binary stars|Bayer objects|Durchmusterung objects|Mensa (constellation)|Henry Draper Catalogue objects|HR objects|Hipparcos objects
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