phi1 Orionis

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

{{Starbox begin

| name = φ¹ 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=8|mark_link=φ¹

|x=587|y=255

}}

|caption=φ¹ (circled) in the constellation Orion

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Orion

| ra = {{RA|05|34|49.23804}}

| dec = {{DEC|+09|29|22.4878}}

| appmag_v = 4.42

}}

{{Starbox character

| class = B0 III

| u-b = −0.97

| b-v = −0.15

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = +33.2

| prop_mo_ra = +0.27

| prop_mo_dec = −2.26

| parallax = 3.00

| p_error = 0.25

| parallax_footnote =

| absmag_v = {{Val|−3.53|0.30}}

}}

{{Starbox orbit

| reference =

| period_unitless = 3,068.03 d

| eccentricity = 0.22

| periastron = 2418051.8 JD

| periarg = 105

| k1 = 13.3

}}

{{Starbox detail

| source =

| mass = {{Val|15.5|1.1}}

| radius = {{Val|6.3|1.0}}

| luminosity = 28,840

| temperature = {{Val|30000|300|fmt=commas}}

| gravity = {{Val|4.05|0.10}}

| metal_fe =

| rotational_velocity = 20

| rotation =

| age_myr = {{Val|7.2|0.8}}

}}

{{Starbox catalog

| names = φ¹ Ori, 37 Orionis, BD+09°877, FK5 208, HD 36822, HIP 26176, HR 1876, SAO 112914.

}}

{{Starbox reference

| Simbad = phi01+Ori

}}

File:Lambda Orionis.jpg and south of λ Orionis]]

Phi¹ Orionis is a binary star system in the constellation Orion, positioned less than a degree to the south of Meissa. It is visible to the naked eye with an apparent visual magnitude of 4.42. The distance to this system, based upon an annual parallax shift of 3.0 mas, is around 1,090 light-years.

This is a single-lined spectroscopic binary star system with an orbital period of 3,068 days and an eccentricity of 0.22. It is a member of the young Lambda Orionis cluster and is roughly 7 million years old. The primary component is a B-type giant star with a stellar classification of B0 III. It has over 15 times the mass of the Sun and around 6.3 times the Sun's radius. Nothing is known about the secondary companion. It does not contribute a significant amount of light to the combined spectrum.

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

| 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 | doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | arxiv=1007.4883

| bibcode=2011MNRAS.410..190T | s2cid=118629873 | postscript=. }}

{{citation

| title=Spitzer Observations of the λ Orionis Cluster. I. The Frequency of Young Debris Disks at 5 Myr

| last3=Hartmann | first3=L. | last4=Muzerolle | first4=J.

| last5=Gutermuth | first5=R. | last6=Stauffer | first6=J.

| journal=The Astrophysical Journal

| volume=707 | issue=1 | pages=705–715 | date=December 2009

| doi=10.1088/0004-637X/707/1/705 | bibcode=2009ApJ...707..705H

| arxiv=0910.3884 | s2cid=17546989 | postscript=. }}

{{citation

| title=Deep-Sky Companions: Hidden Treasures

| first1=Stephen James | last1=O'Meara

| publisher=Cambridge University Press | year=2007

| isbn=978-1139463737 | page=146 | postscript=.

| url=https://books.google.com/books?id=a6VY0Q1zsJoC&pg=PA146 }}

{{citation

| last=Wilson | first=R. E. | year=1953

| title=General Catalogue of Stellar Radial Velocities

| journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institute of Washington, D.C.

| bibcode=1953GCRV..C......0W | postscript=. }}

{{citation

| title=The Lambda Orionis association

| last1=Murdin | first1=P. | last2=Penston | first2=M. V.

| journal=Monthly Notices of the Royal Astronomical Society

| volume=181 | pages=657–665 | date=December 1977

| issue=4 | doi=10.1093/mnras/181.4.657 | bibcode=1977MNRAS.181..657M

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

{{citation

| last1=Simón-Díaz | first1= S. | last2=Herrero | first2=A.

| title=The IACOB project. I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening

| journal=Astronomy & Astrophysics

| volume=562 | pages=A135 | year=2014

| bibcode=2014A&A...562A.135S | doi=10.1051/0004-6361/201322758

| arxiv=1311.3360 | s2cid= 119278062 | postscript=. }}

{{citation

| last1=Levato | first1=H.

| title=Rotational velocities and spectral types for a sample of binary systems

| journal=Astronomy and Astrophysics Supplement Series

| volume=19 | pages=91–99 | date=January 1975

| bibcode=1975A&AS...19...91L | postscript=. }}

{{citation

| title=S_B⁹: The ninth catalogue of spectroscopic binary orbits