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Pi5 Orionis

{{Short description|Spectroscopic binary star system in the constellation Orion}}

{{for|other stars with this Bayer designation|Pi Orionis}}

{{DISPLAYTITLE:Pi5 Orionis}}

{{Starbox begin

| name=π5 Orionis

}}

{{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=π5 Orionis

|x=869|y=449

}}

|caption=Location of π5 Orionis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Orion

| ra = {{RA|04|54|15.09604}}

| dec = {{DEC|+02|26|26.4231}}

| appmag_v = 3.69

}}

{{Starbox character

| class = B2 III

| u-b = −0.81

| b-v = −0.18

| r-i =

| variable = Ellipsoidal (SPB?)

}}

{{Starbox astrometry

| radial_v = +23.4

| prop_mo_ra = +0.55

| prop_mo_dec = +0.61

| parallax = 2.43

| p_error = 0.39

| parallax_footnote =

| absmag_v = −4.3

}}

{{Starbox orbit

| reference =

| period_unitless = {{val|fmt=commas|3.700373|ul=d}}

| eccentricity = {{val|0.083|0.040}}

| inclination = 34

| axis_unitless = {{val|25.9|ul=AU}}

| periastron = {{Val|2433341.088|0.010|u=JD|fmt=commas}}

| periarg =

| k1 = {{Val|60.41|1.99}}

}}

{{Starbox detail

| component1 = π5 Ori A

| mass = 12

| radius = 12

| luminosity = 11,262

| temperature = 14,496

| gravity = 3.51

| metal_fe = −0.28

| rotational_velocity = 90

| rotation =

| age_myr = {{Val|15.8|0.2}}

| component2 = π5 Ori B

| mass2 = 5.0

| temperature2 = 15,596 - 16,520

| luminosity2 = 525 - 741

| radius2 = 2.8 - 3.8

| gravity2 = 3.98 - 4.24

}}

{{Starbox catalog

| names = π5 Ori, 8 Orionis, BD+02°810, HD 31237, HIP 22797, HR 1567, SAO 112197

}}

{{Starbox reference

| Simbad = pi05+Ori

}}

{{Starbox end}}

Pi5 Orionis (π5 Ori, π5 Orionis) is a binary star system in the constellation Orion. It has an apparent visual magnitude of 3.69, which is bright enough to be visible to the naked eye on a clear night. Based upon an annual parallax shift of 2.43 mas, it is around 1,300 light-years distant from the Sun.

File:Pi5OriLightCurve.png for Pi5 Oronis, plotted from TESS data]]

This is a single-lined spectroscopic binary star system in a circular orbit with an orbital period of 3.7005 days. It is an ellipsoidal variable, which means the orbit is sufficiently close that the shapes of the components are being distorted by their mutual gravitation. This is causing the visual magnitude of the system to vary regularly by 0m.05 over the course of each orbit, as the orientation of the stars change with respect to the Earth. Detailed analysis of the light curve suggests that the primary star is also pulsating and is probably a Slowly pulsating B-type star.

The primary component is a B-type giant star with a stellar classification of B2 III. It is only about 16 million years old and spins with a projected rotational velocity of 90 km/s. Despite the spectral class, the primary star is thought to be at or near the end of its main sequence evolution. It has about 12.5 times the mass of the Sun and radiates 11,262 times the solar luminosity from its outer atmosphere at an effective temperature of {{val|14496|ul=K|fmt=commas}}.

The secondary star is not detectable clearly, but modelling of the brightness variations and orbit suggest that it is a main sequence star with a spectral class of about B6. It is smaller, cooler, and much less luminous than the primary, and orbits at about 26 astronomical units.

{{clear left}}

References

{{reflist|refs=

{{cite journal

| title=XHIP: An extended hipparcos compilation

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

| journal=Astronomy Letters | arxiv=1108.4971

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

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

| s2cid=119257644 }}

{{cite journal |bibcode=2020MNRAS.496.2391J |title=BRITE-Constellation photometry of π5 Orionis, an ellipsoidal SPB variable |last1=Jerzykiewicz |first1=M. |last2=Pigulski |first2=A. |last3=Handler |first3=G. |last4=Moffat |first4=A. F. J. |last5=Popowicz |first5=A. |last6=Wade |first6=G. A. |last7=Zwintz |first7=K. |last8=Pablo |first8=H. |journal=Monthly Notices of the Royal Astronomical Society |year=2020 |volume=496 |issue=2 |page=2391 |doi=10.1093/mnras/staa1665 |doi-access=free |arxiv=2006.05178 }}

{{cite web

| title=MAST: Barbara A. Mikulski Archive for Space Telescopes

| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html

| publisher=Space Telescope Science Institute |access-date=9 December 2022}}

{{citation

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

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{{citation

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| title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30

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{{citation

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| title=The PASTEL catalogue of stellar parameters

| journal=Astronomy and Astrophysics

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

| doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S

| postscript=. |arxiv = 1004.1069 | s2cid=118362423 }}

{{citation

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| journal=Astrophysical Journal, Part 1

| volume=295 | pages=143–152 | date=August 1985

| doi=10.1086/163359 | bibcode=1985ApJ...295..143M

| postscript=. }}

{{citation

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| title=Tidal Effects in Binaries of Various Periods

| journal=The Astrophysical Journal

| volume=616 | issue=1 | pages=562–566 | date=November 2004

| doi=10.1086/423795 | bibcode=2004ApJ...616..562A

| postscript=. | doi-access=free }}

{{citation

| 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 | issue=1 | pages=190–200 | date=January 2011

| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T

| postscript=. |arxiv = 1007.4883 | s2cid=118629873 }}

{{citation

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| 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| arxiv=1208.2037

| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}

{{citation

| title=SB9: The ninth catalogue of spectroscopic binary orbits

| journal=Astronomy & Astrophysics

| display-authors=1 | last1=Pourbaix | first1=D.

| last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H.

| last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I.

| last6=Levato | first6=H. | last7=Morrell | first7=N. I.

| last8=Torres | first8=G. | last9=Udry | first9=S.

| volume=424 | issue=2 | pages=727–732 | date=2004

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| arxiv=astro-ph/0406573 | s2cid=119387088

| postscript=. }}

{{citation

| title = A spectroscopic survey on the multiplicity of high-mass stars

| journal = Monthly Notices of the Royal Astronomical Society

| volume = 424 | issue = 3 | pages = 1925 | year = 2012

| display-authors=1 | last1 = Chini | first1 = R.

| last2 = Hoffmeister | first2 = V. H. | last3 = Nasseri | first3 = A.

| last4 = Stahl | first4 = O. | last5 = Zinnecker | first5 = H.

| bibcode = 2012MNRAS.424.1925C | doi = 10.1111/j.1365-2966.2012.21317.x

| doi-access = free

| arxiv = 1205.5238 | s2cid = 119120749

| postscript=. }}

{{cite simbad

| title=pi.05 Ori

| accessdate=2016-11-18 | postscript=. }}

}}

External links

  • {{citation

| title=Pi-5 Orionis | last1=Kaler | first1=James B.

| work=Stars | date=February 6, 2009 | publisher=University of Illinois

| url=http://stars.astro.illinois.edu/sow/pi5ori.html

| access-date=2016-11-22 | postscript=. }}

{{Stars of Orion|state=collapsed}}

{{DEFAULTSORT:Pi5 Orionis}}

Category:B-type giants

Category:Rotating ellipsoidal variables

Category:Spectroscopic binaries

Category:Orion (constellation)

Orionis, Pi5

Category:Durchmusterung objects

Orionis, 08

031237

022797

1567