32 Orionis

{{Short description|Triple star system in the constellation Orion}}

{{Starbox image

| image =

{{Location mark

|image=Orion constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=32 Orionis

|x=615|y=352

}}

| caption = Location of 32 Orionis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Orion

| ra = {{RA|05|30|47.05091}}

| dec = {{DEC|+05|56|53.2925}}

| appmag_v = 4.20 {{nowrap|(4.43 + 5.80)}}

}}

{{Starbox character

| type =

| class = {{nowrap|B5V + ? + B7V}}

| b-v = –0.13

| u-b = –0.56

| variable =

}}

{{Starbox astrometry

| radial_v = +18.60

| prop_mo_ra = +5.10

| prop_mo_dec = –33.30

| parallax = 10.77

| p_error = 0.64

| parallax_footnote =

| absmag_v = –0.63

}}

{{Starbox detail

| component1 = 32 Ori A

| mass = 5.0

| radius = 2.9

| temperature = 16,020

| luminosity = 388

| rotational_velocity = 169

| gravity = 4.40

| metal_fe =

| age_myr = 65

}}

{{Starbox catalog

| names = {{odlist | B=A Ori | F=32 Ori | NSV=14617 | BD=+05°939 | GC=6813 | HD=36267 | HIP=25813 | HR=1839 | SAO=112849 | WDS=J05308+0557AB | CCDM=J05308+0557AB }}

}}

{{Starbox reference

| Simbad = 32+Orionis

}}

32 Orionis is a triple star system in the equatorial constellation of Orion. It has the Bayer designation A Orionis, while 32 Orionis is the Flamsteed designation. This system is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.20. It is located approximately 303 light-years away from the Sun based on parallax, and is drifting further away with a radial velocity of +18.6 km/s.

The system is a member of the eponymous 32 Orionis group, a young, nearby association of 46 co-moving stars first discovered in 2007. Research in 2015 suggested that Bellatrix is a probable member of the group due to its distance and position in the sky and suggested it be called the Bellatrix Cluster,{{Cite journal |last1=Bouy |first1=H. |last2=Alves |first2=J. |date=2015-12-01 |title=Cosmography of OB stars in the solar neighbourhood |url=https://www.aanda.org/articles/aa/abs/2015/12/aa27058-15/aa27058-15.html |journal=Astronomy & Astrophysics |language=en |volume=584 |pages=A26 |doi=10.1051/0004-6361/201527058 |bibcode=2015A&A...584A..26B |issn=0004-6361}} although further research in 2017 called Bellatrix's membership into question due to its proper motion deviating significantly from the group.

The primary component of this system is a B-type main-sequence star with a stellar classification of B5V and a magnitude around 4.43. This is actually a spectroscopic binary with an orbital period of 3.964 days and eccentricity of 0.38. The unseen companion has an estimated mass of 0.6 times that of the Sun. Component B, at an angular separation of {{Val|1.08|ul=arcsecond}} from the primary, is a class B7V star with a magnitude of 5.8, orbiting with the primary at a period of 614 years and eccentricity 0.22.

References

{{reflist|refs=

{{cite journal

| 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 }}

{{cite journal

| title=Validation of the new Hipparcos reduction

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | year=2007

| last1=Van Leeuwen | first1=F.

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357

| s2cid=18759600

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HIP%2025813 Vizier catalog entry]

{{cite journal

| title=Catalogue of Stellar Photometry in Johnson's 11-color system

| journal=CDS/ADC Collection of Electronic Catalogues

| last1=Ducati | first1=J. R.

| volume=2237 | year=2002 | bibcode=2002yCat.2237....0D }}

{{cite journal

| title=A stellar census of the nearby, young 32 Orionis group

| display-authors=1 | last1=Bell | first1=Cameron P. M.

| last2=Murphy | first2=Simon J. | last3=Mamajek | first3=Eric E.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=468 | issue=1 | pages=1198–1220 | date=June 2017

| doi=10.1093/mnras/stx535 | doi-access=free | arxiv=1703.00015

| bibcode=2017MNRAS.468.1198B }}

{{cite journal

| title=Bright Star Catalogue

| journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H

| last1=Hoffleit | first1=D. | last2=Warren | first2=W. H.

| volume=5050 | edition=5th | year=1995

| bibcode=1995yCat.5050....0H }}

{{cite journal

| title=Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations

| journal=Astronomische Nachrichten

| volume=328 | issue=9 | pages=889 | year=2007

| display-authors=1 | last1=Kharchenko | first1=N.V.

| last2=Scholz | first2=R.-D. | last3=Piskunov | first3=A.E.

| last4=Röser | first4=S. | last5=Schilbach | first5=E.

| bibcode=2007AN....328..889K | arxiv=0705.0878

| doi=10.1002/asna.200710776 | s2cid=119323941

}}

{{cite journal

| title=XHIP: An extended hipparcos compilation

| journal=Astronomy Letters

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

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

| bibcode=2012AstL...38..331A | arxiv=1108.4971

| doi=10.1134/S1063773712050015

| s2cid=119257644

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=25813 Vizier catalog entry]

{{cite journal

| display-authors=1 | last1=Tetzlaff | first1=N.

| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.

| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun

| journal=Monthly Notices of the Royal Astronomical Society

| volume=410 | pages=190–200 | year=2011

| issue=1 | bibcode=2011MNRAS.410..190T

| doi=10.1111/j.1365-2966.2010.17434.x

| doi-access=free | arxiv=1007.4883

| s2cid=118629873 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/MNRAS/410/190/table1&HIP=25813 Vizier catalog entry]

{{cite journal

| last1=Allende Prieto | first1=C. | last2=Lambert | first2=D. L.

| title=Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures

| journal=Astronomy and Astrophysics

| volume=352 | pages=555–562 | year=1999

| bibcode=1999A&A...352..555A | arxiv=astro-ph/9911002

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/A%2bA/352/555/table1&Name=HIP25813 Vizier catalog entry]

{{cite journal

| display-authors=1 | last1=Zorec | first1=J.

| last2=Cidale | first2=L. | last3=Arias | first3=M. L.

| last4=Frémat | first4=Y. | last5=Muratore | first5=M. F.

| last6=Torres | first6=A. F. | last7=Martayan | first7=C.

| title=Fundamental parameters of B supergiants from the BCD system

| journal=Astronomy and Astrophysics

| volume=501 | pages=297–320 | year=2009

| issue=1 | arxiv=0903.5134 | bibcode=2009A&A...501..297Z

| doi=10.1051/0004-6361/200811147 | s2cid=14969137 }}

{{cite journal

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| bibcode=2015ApJ...804..146D | arxiv=1501.03154

| doi=10.1088/0004-637X/804/2/146

| s2cid=33401607

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/ApJ/804/146/table5&HIP=25813 Vizier catalog entry]

{{cite journal

| title=Comparative statistics and origin of triple and quadruple stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=389 | issue=2 | pages=925–938 | year=2008

| last1=Tokovinin | first1=A.