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25 Orionis

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

{{other stars by Bayer designation|psi Orionis{{!}}ψ Orionis}}

{{Starbox begin |

name=25 Orionis, ψ1 Orionis}}

{{Starbox image |

image=250px |

caption=25 Orionis is located roughly between δ Ori and γ Ori.}}

{{Starbox observe

|epoch=J2000

|ra={{RA|05|24|44.82738}}

| dec={{DEC|01|50|47.2019}}

|appmag_v=4.92 - 4.96

|constell=Orion

}}

{{Starbox character

|class=B1Vn

|b-v=−0.20

|u-b=−0.92

|variable=γ Cas

}}

{{Starbox astrometry

|radial_v=19.3 ± 2

|prop_mo_ra=+1.047

|prop_mo_dec=+0.433

|parallax=2.9321

|p_error=0.1219

|parallax_footnote=

|absmag_v=

}}

{{Starbox detail

| mass=10.5

| radius=6.4

| luminosity=10,500

| temperature=24,661 ± 339

| gravity=4.0

| metal_fe=

| rotational_velocity=316

| age_myr = ~100

}}

{{Starbox catalog

|names={{odlist|B=ψ1 Ori|F=25 Ori|V=V1086 Ori|HR=1789|BD=+01 1005|HD=35439|FK5=2406|HIP=25302|SAO=112734|CCDM=J05247+0150A}}

}}

{{Starbox reference

|Simbad=*+25+Ori

}}

{{Starbox end}}

25 Orionis, less commonly known by its Bayer designation Psi1 Orionis (ψ1 Orionis, ψ1 Ori) is a fifth-magnitude star in the constellation Orion. It lies among a dense cluster of low-mass pre-main-sequence stars in the Orion OB1a.

Stellar group

25 Orionis is the dominant member of a rich low-mass star region, first identified in 2005 in a statistical analysis of 2.5 million stars. It is one of several sub-associations within Orion OB1a, all thought to lie at around the same distance of 338 parsecs. Over 200 members of the 25 Orionis stellar group have been found, mostly T Tauri stars with spectral types of K and M and masses less than half the sun's. There are also around 60 hotter stars in the region, including the eruptive variable V346 Tauri. This region is known as Briceño 1.

Properties

File:V1086OriLightCurve.png for V1086 Orionis, plotted from Hipparcos data]]

Like the star Pleione in the Pleiades open cluster, 25 Ori is a Be star with a gaseous circumstellar disk. The SIMBAD astronomical database lists its spectral class as B1Vn.

25 Orionis is a fast rotator, clocking a rotational velocity of 316 km/s, significantly faster than Achernar's speed of 251 km/s in the constellation Eridanus. Having a radius of {{Solar radius|link=y|6}}, the star rotates on its axis roughly once every 23 hours. With a mass in excess of {{Solar mass|link=y|10}}, the star is expected to explode as a supernova.

25 Orionis is a Gamma Cassiopeiae variable star, and has been given the variable star designation V1086 Orionis. The General Catalog of Variable Stars lists its magnitude as varying between magnitude 4.92 and 4.96 in the visual (V) band - an amplitude only 0.04 magnitudes. However photometry by the Hipparcos satellite, which had a passband broader than the V band, showed a 0.145 magnitude range in brightness.

{{clear left}}

See also

References

{{reflist|refs=

{{cite Gaia DR3|3222282691086558464}}

{{cite simbad

| title =* 25 Ori

| access-date = 2010-11-07 }}

{{cite journal

|display-authors = 1

|author = Johnson, H. L.

|author2 = Iriarte, B.

|author3 = Mitchell, R. I.

|author4 = Wisniewski, W. Z.

|title = UBVRIJKL photometry of the bright stars

|journal = Communications of the Lunar and Planetary Laboratory

|volume = 4

|issue = Part 1

|pages = 99–110

|date = 1966

|bibcode = 1966CoLPL...4...99J

}}

{{cite web

| title=Bright Star Catalogue (Hoffleit+, 1991)

| edition=5th Revised | work=VizieR | publisher=Centre de Données astronomiques de Strasbourg

| url=http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HR%20472

|accessdate=2010-11-08}}

{{cite journal

| last1=van Leeuwen | first1=F. | last2=Evans | first2=D. W. | last3=Grenon | first3=M.

| last4=Grossmann | first4=V. | last5=Mignard | first5=F. | last6=Perryman | first6=M. A. C.

| title=The HIPPARCOS mission: photometric data | journal=Astronomy and Astrophysics

| date=July 1997 | volume=323 | issue=2 | pages=L61–L64 | doi=10.1051/0004-6361/200912304 | bibcode=2009A&A...507.1141L | doi-access=free }}

{{cite journal

| last1=Lefèvre | first1=L. | last2=Marchenko | first2=S. V.

| last3=Moffat | first3=A. F. J. | last4=Acker | first4=A.

| title=A systematic study of variability among OB-stars based on HIPPARCOS photometry

| journal=Astronomy and Astrophysics | date=November 2009 | volume=507 | issue=2

| pages=1141–1201 | bibcode=2009A&A...507.1141L | doi=10.1051/0004-6361/200912304 | doi-access=free }}

{{cite web

| url=https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats

| website=Centre de Données astronomiques de Strasbourg | title=/ftp/cats/more/HIP/cdroms/cats

| publisher=Strasbourg astronomical Data Center | access-date=15 October 2022}}

{{cite journal| display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | issue=3 | pages=601–605 | bibcode=1979MNRAS.189..601U |date=November 1979 | doi=10.1093/mnras/189.3.601| doi-access=free }}

{{cite web | title=25 ORI (25 Orionis) | work=Stars | publisher=University of Illinois | first1=James B. | last1=Kaler | url=http://stars.astro.illinois.edu/sow/25ori.html | accessdate=2010-11-07 }}

{{cite book | title=Bright Star Catalogue (Hoffleit+, 1991) | edition=5th Revised | work=VizieR | publisher=Centre de Données astronomiques de Strasbourg | url=http://vizier.u-strasbg.fr/viz-bin/VizieR-S?HR%201789 | accessdate=2010-11-07 }}

{{cite journal

| title=General catalogue of stellar radial velocities | journal=Washington

| author=Wilson, Ralph Elmer | date=1953 | bibcode=1953GCRV..C......0W}}

{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}

{{cite journal|bibcode=2017AJ....154...14S|arxiv=1705.02722|title=New Low-mass Stars in the 25 Orionis Stellar Group and Orion OB1a Sub-association from SDSS-III/BOSS Spectroscopy|journal=The Astronomical Journal|volume=154|pages=14|last1=Suárez|first1=Genaro|last2=José Downes|first2=Juan|last3=Román-Zúñiga|first3=Carlos|last4=Covey|first4=Kevin R.|last5=Tapia|first5=Mauricio|last6=Hernández|first6=Jesús|last7=Petr-Gotzens|first7=Monika G.|last8=Stassun|first8=Keivan G.|last9=Briceño|first9=César|issue=1|year=2017|doi=10.3847/1538-3881/aa733a|s2cid=119087968 |doi-access=free }}

{{cite journal

| display-authors=1

| author=Briceño, César

| author2=Hartmann, Lee

| author3=Hernández, Jesús

| author4=Calvet

| title=25 Orionis: A Kinematically Distinct 10 Myr Old Group in Orion OB1a

| journal=The Astronomical Journal

|date=June 2007

| volume=661

| issue=2

| pages=1119–1128

| bibcode=2007ApJ...661.1119B

| doi=10.1086/513087|arxiv = astro-ph/0701710 | s2cid=118950935

}}

{{cite journal|bibcode=2005A&A...440..403K|arxiv=astro-ph/0505019|title=109 new Galactic open clusters|journal=Astronomy and Astrophysics|volume=440|pages=403–408|last1=Kharchenko|first1=N. V.|last2=Piskunov|first2=A. E.|last3=Röser|first3=S.|last4=Schilbach|first4=E.|last5=Scholz|first5=R.-D.|issue=1|year=2005|doi=10.1051/0004-6361:20052740|s2cid=56292154}}

}}

External links

  • Jim Kaler's Stars, University of Illinois: [http://stars.astro.illinois.edu/sow/25ori.html 25 ORI (25 Orionis)]
  • Philippe Stee's in-depth information on: [http://www.oca.eu/stee/page1/page3/page3.html Hot and Active Stars Research]
  • Olivier Thizy's in-depth information on: [https://web.archive.org/web/20100823155536/http://www.shelyak.com/dossier.php?id_dossier=24 Be Stars]

{{Sky|05|24|44.80|+|01|50|47.0|100000}}

{{Stars of Orion}}

Category:Orion (constellation)

Category:B-type main-sequence stars

Category:Be stars

Orionis, Psi1

Orionis, 25

1789

35439

025302

BD+01 1005

Orionis, V1086