69 Orionis

{{about|f¹ Orionis|other stars with this Bayer designation|f 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=69 Orionis

|x=335|y=72

}}

| caption = Location of 69 Orionis (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Orion

| ra = {{RA|06|12|03.27955}}

| dec = {{DEC|16|07|49.4614}}

| appmag_v = 4.92

}}

{{Starbox character

| type = main sequence

| class = B5Vn

| b-v = −0.12

| u-b = −0.59

| variable =

}}

{{Starbox astrometry

| radial_v = +22.00

| prop_mo_ra = +5.49

| prop_mo_dec = −16.80

| parallax = 6.17

| p_error = 0.25

| parallax_footnote =

| absmag_v = −1.09

}}

{{Starbox detail

| source =

| mass = {{Val|6.4|0.2}}

| radius = 3.4

| temperature = 17,090

| luminosity = {{Val|1442|248|212|fmt=commas}}

| rotational_velocity = {{Val|285|23}}

| gravity = {{Val|4.05|0.17}}

| metal_fe = +0.01

| age_myr = 10–40

}}

{{Starbox catalog

| names = {{odlist | B=f¹ Ori | F=69 Ori | BD=+16°1035 | FK5= | HD=42545 | HIP=29434 | HR=2198 | SAO=95365 | GC=7891 }}

}}

{{Starbox reference

| Simbad = 69+Ori

}}

69 Orionis is a single star in the equatorial constellation of Orion, positioned a couple of degrees to the north of Xi Orionis. It has the Bayer designation f¹ Orionis; 69 Orionis is the Flamsteed designation. The star is visible to the naked eye as faint, blue-white hued point of light with an apparent visual magnitude of 4.92. It is located approximately 530 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +22 km/s. In 2015, H. Bouy and J. Alves suggested that it is a member of the newly discovered Taurion OB association.

This object is a B-type main-sequence star with a stellar classification of B5Vn, where the 'n' suffix indicates "nebulous" (broad) lines due to rapid rotation. It has a projected rotational velocity of 285 km/s, compared to a critical velocity of {{Val|476|37|ul=km/s}}; the polar axis is inclined by {{Val|64|16|u=°}}. This is a known Be star that began behaving as a normal star in November, 1982. It has 6.4 times the mass of the Sun and is radiating around 1,442 times the Sun's luminosity from its photosphere at an effective temperature of {{val|17090|ul=K|fmt=commas}}.

References

{{reflist|refs=

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{{cite journal

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| journal=Astronomy Letters | arxiv=1108.4971

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

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

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| s2cid=119257644 }} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=V/137D/XHIP&HIP=29434 Vizier catalog entry]

{{cite journal

| last1=Zorec | first1=J. | last2=Frémat | first2=Y.

| last3=Domiciano De Souza | first3=A. | last4=Royer | first4=F.

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| last11=Aidelman | first11=Y. | last12=Stee | first12=P.

| title=Critical study of the distribution of rotational velocities of Be stars

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=595 | pages=A132 | year=2016

| bibcode=2016A&A...595A.132Z | doi=10.1051/0004-6361/201628760 | doi-access=free | hdl=11336/37946 | hdl-access=free }}

{{cite journal

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| bibcode=2012AstL...38..771G | arxiv=1606.08814

| doi=10.1134/S1063773712120031

| s2cid=118345778

}} [http://vizier.u-strasbg.fr/viz-bin/VizieR-4?-source=J/PAZh/38/860/thin&HIP=29434 Vizier catalog entry]

{{cite journal

| title=Cosmography of OB stars in the solar neighbourhood

| last1=Bouy | first1=H. | last2=Alves | first2=J.

| journal=Astronomy & Astrophysics

| volume=584 | id=A26 | pages=13 | date=December 2015

| doi=10.1051/0004-6361/201527058

| bibcode=2015A&A...584A..26B | doi-access=free }}

{{cite journal

| last=Lesh | first=Janet Rountree

| title=The Kinematics of the Gould Belt: an Expanding Group?

| journal=Astrophysical Journal Supplement

| volume=17 | page=371 | date=December 1968

| doi=10.1086/190179 | bibcode=1968ApJS...17..371L | doi-access=free }}

{{cite journal

| title=Spectrophotometric Study of Four Bright Be Stars

| last1=Goraya | first1=P. S. | last2=Tur | first2=N. S.

| journal=Astrophysics and Space Science

| volume=236 | issue=2 | pages=175–183 | date=February 1996

| doi=10.1007/BF00645142 | bibcode=1996Ap&SS.236..175G | s2cid=123576634 }}

{{cite journal

| display-authors=1 | last1=Pasinetti Fracassini | first1=L. E.

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| volume=367 | issue=2 | pages=521–524 | date=February 2001

| bibcode=2001A&A...367..521P | arxiv=astro-ph/0012289

| doi=10.1051/0004-6361:20000451 | s2cid=425754 }}

{{cite journal

| title=Spectroscopic and photometric observations of the Be star 69 Orionis

| last1=Bossi | first1=M. | last2=Guerrero | first2=G.

| last3=Mantegazza | first3=L. | last4=Rusconi | first4=L.

| last5=Scardia | first5=M. | last6=Sedmak | first6=G.

| journal=Astronomy and Astrophysics Supplement Series

| volume=46 | pages=173–177 | date=November 1981

| display-authors=1 | bibcode=1981A&AS...46..173B }}

}}

Category:B-type main-sequence stars

Category:Be stars

Category:Orion (constellation)