Delta Normae

{{Short description|Star in the constellation Norma}}

{{Starbox begin

| name = Delta Normae

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Norma

| ra = {{RA|16|06|29.43692}}

| dec = {{DEC|−45|10|23.4518}}

| appmag_v = 4.74

}}

{{Starbox character

| class = kA3hA7mF0 III:

| b-v = +0.24

| u-b = +0.16

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−15.5|2.8}}

| prop_mo_ra = −16.19

| prop_mo_dec = −38.45

| parallax = 26.66

| p_error = 0.74

| parallax_footnote =

| absmag_v = +1.86

}}

{{Starbox detail

| source =

| mass = 1.75

| radius = 2.00

| luminosity = 13.4

| temperature = 7,691

| gravity = 4.04

| metal_fe = +0.32

| rotational_velocity = 7

| age_myr = {{Val|62.5|12.5}}

}}

{{Starbox catalog

| names = {{odlist | B=δ Nor | CD=−44°10625 | FK5=596 | HD=144197 | HIP=78914 | HR=5980 | SAO=226500 }}

}}

{{Starbox reference

| Simbad = del+Nor

}}

{{Starbox end}}

Delta Normae, Latinised from δ Normae, is a star system in the southern constellation of Norma. It is visible to the naked eye with an apparent visual magnitude of 4.74. Based upon an annual parallax shift of 26.66 mas as seen from Earth, the system is located about 122 light-years distant from the Sun.

Because the proper motion of the star has been found to change over time, this is most likely an astrometric binary. The visible component is an Am star, which means it displays the spectrum of a metal-lined A-type chemically peculiar star. The stellar classification of kA3hA7mF0 III: indicates it is an evolved giant with the calcium K-lines of an A3-class star, the hydrogen lines of an A7 star, and F0-class metallic lines. It has a magnetic field with an effective strength of {{Val|169.73e-4|151.7|ul=T}}.

Delta Normae has an estimated 1.75 times the mass of the Sun and twice the Sun's radius. It is around 63 million years old, and, as with other Am stars, has a relatively low spin rate with a projected rotational velocity of 7 km/s. The star is radiating 13.4 times the Sun's luminosity from its photosphere at an effective temperature of {{Val|7691|fmt=commas|ul=K}}.

References

{{reflist|refs=

{{citation

| 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=. }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{citation

| display-authors=1 | last1=Plavchan | first1=Peter

| last2=Werner | first2=M. W. | last3=Chen | first3=C. H.

| last4=Stapelfeldt | first4=K. R. | last5=Su | first5=K. Y. L.

| last6=Stauffer | first6=J. R. | last7=Song | first7=I.

| title=New Debris Disks Around Young, Low-Mass Stars Discovered with the Spitzer Space Telescope

| journal=The Astrophysical Journal

| volume=698 | issue=2 | pages=1068–1094 | date=June 2009

| doi=10.1088/0004-637X/698/2/1068 | bibcode=2009ApJ...698.1068P

| arxiv=0904.0819 | s2cid=51417657 | postscript=. }}

{{citation

| display-authors=1 | last1=Frankowski | first1=A.

| last2=Jancart | first2=S. | last3=Jorissen | first3=A.

| title=Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data

| journal=Astronomy and Astrophysics

| volume=464 | issue=1 | pages=377–392 |date=March 2007

| doi=10.1051/0004-6361:20065526 | bibcode=2007A&A...464..377F

| arxiv=astro-ph/0612449 | s2cid=14010423 | postscript=. }}

{{citation

| title=Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars

| display-authors=1 | last1=Bychkov | first1=V. D. | postscript=.

| last2=Bychkova | first2=L. V. | last3=Madej | first3=J.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=394 | issue=3 | pages=1338–1350 | date=April 2009

| doi=10.1111/j.1365-2966.2008.14227.x | bibcode=2009MNRAS.394.1338B | s2cid=120268049 | doi-access=free }}

{{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

| doi-access=free | arxiv=1208.2037 | s2cid=118665352 | postscript=. }}

{{citation

| title=Photoelectric UBVRI observations of Am stars

| journal=Astronomical Journal |volume=79|pages=1290

| last1=Feinstein | first1=A. | postscript=. | year=1974

| bibcode=1974AJ.....79.1290F | doi=10.1086/111675 }}

{{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 | doi-access=free | bibcode=2008MNRAS.389..869E

| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{citation | display-authors=1

| last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F.

| last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A.

| title=The PASTEL catalogue of stellar parameters

| journal=Astronomy and Astrophysics

| volume=515 | page=A111 | date=June 2010

| doi=10.1051/0004-6361/201014247 | postscript=.

| bibcode=2010A&A...515A.111S | arxiv=1004.1069 | s2cid=118362423 }}

{{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 | s2cid=59451347 | postscript=. }}

{{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=. }}

{{cite simbad

| title=del Nor | accessdate=2017-08-12 | postscript=. }}

}}

{{Stars of Norma|state=collapsed}}

{{DEFAULTSORT:Delta Normae}}

Category:Am stars

Category:Astrometric binaries

Category:Norma (constellation)

Normae, Delta

Category:Durchmusterung objects

078914

144197

5980