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词条 Rho Orionis
释义

  1. Notes

  2. References

{{Starbox begin
| name = ρ Orionis
}}{{Starbox image
| image={{Location mark
|image=Orion constellation map.svg|alt=|float=center|width=260
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=ρ Ori
|x=738|y=437
}}
|caption=Location of ρ Orionis (circled)
}}{{Starbox observe
| epoch = J2000.0
| constell = Orion
| ra = {{RA|05|13|17.48015}}[1]
| dec = {{DEC|+02|51|40.5479}}[1]
| appmag_v = +4.44[1]
}}{{Starbox character
| class = K0 III[2]
| u-b = +1.13[1]
| b-v = +1.19[1]
}}{{Starbox astrometry
| radial_v = +40.5[3]
| prop_mo_ra = +0.83[4]
| prop_mo_dec = +3.91[4]
| parallax = 9.32
| p_error = 0.94
| parallax_footnote = [4]
| absmag_v = −0.65[5]
}}{{Starbox detail
| source = [6]
| temperature = 4,533
| luminosity = 251
| mass = 2.67
| radius = 25[13]
| age_myr = 650
| gravity = 2.4[7]
| metal_fe = 0.06[7]
}}{{Starbox orbit
| reference = [8]
| period_unitless = 1031.4 days
| axis_unitless = 6.9 mas[9]
| eccentricity = 0.1
| inclination = 122.8
| node = 242.6
| periastron = 2426182.46
| periarg = 17.9
| k1 = 8.70
}}{{Starbox catalog
| names = {{odlist | B=ρ Ori | F=17 Orionis | BD=+02° 888 | HD=33856 | HIP=24331 | HR=1698 | SAO=112528 }}
}}{{Starbox reference
| Simbad = rho+Ori
}}{{Starbox end}}Rho Orionis, Latinized from ρ Orionis, is the Bayer designation for an orange-hued binary star system in the equatorial constellation of Orion. It is visible to the naked eye with an apparent visual magnitude of +4.44.[1] The star shows an annual parallax shift of 9.32 mas due to the orbital motion of the Earth, which provides a distance estimate of roughly 350 light years from the Sun. It is moving away from the Sun with a radial velocity of +40.5 km/s.[3] About 2.6 million years ago, Rho Orionis made its perihelion passage at a distance of around {{Convert|3.1|pc|ly|order=flip|abbr=on}}.[10]

This is a single-lined spectroscopic binary system with an orbital period of 2.8 years and an eccentricity of 0.1.[8] The visible component is an evolved giant star of type K with a stellar classification of K0 III.[2] Its measured angular diameter is {{Val|2.19|0.02|u=mas}},[11] which, at its estimated distance yields a physical size of about 25 times the radius of the Sun.[12] It has 2.67 times the mass of the Sun and is about 650 million years old. The star is radiating 251 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,533 K.[6]

Notes

1. ^1 2 3 {{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati|first1=J. R.|year=2002}}
2. ^1 {{cite journal|bibcode=1999MSS...C05....0H|title=Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5|journal=Michigan Spectral Survey|volume=05|pages=0|author1=Houk|first1=N.|last2=Swift|first2=C.|year=1999}}
3. ^1 {{cite journal|bibcode=2005A&A...430..165F |title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters |journal=Astronomy and Astrophysics |volume=430 |pages=165 |author1=Famaey |first1=B. |last2=Jorissen |first2=A. |last3=Luri |first3=X. |last4=Mayor |first4=M. |last5=Udry |first5=S. |last6=Dejonghe |first6=H. |last7=Turon |first7=C. |year=2005 |doi=10.1051/0004-6361:20041272 |arxiv = astro-ph/0409579 }}
4. ^1 2 3 4 {{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 | postscript=. }}
5. ^{{cite journal|bibcode=2000PASP..112.1320S|title=CaII K Emission-Line Asymmetry among Red Giants Detected by the ROSAT Satellite|journal=The Publications of the Astronomical Society of the Pacific|volume=112|issue=776|pages=1320|author1=Smith|first1=Graeme H.|last2=Shetrone|first2=Matthew D.|year=2000|doi=10.1086/316634}}
6. ^1 {{cite journal|bibcode=2015AJ....150...88L|title=Abundances in the Local Region. I. G and K Giants|journal=The Astronomical Journal|volume=150|issue=3|pages=88|author1=Luck|first1=R. Earle|year=2015|doi=10.1088/0004-6256/150/3/88|arxiv = 1507.01466 }}
7. ^1 {{citation | last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F. | last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A. | 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 }}
8. ^1 {{citation | title=Hipparcos Photocentric Orbits of 72 Single-lined Spectroscopic Binaries | last1=Ren | first1=S. | journal=The Astronomical Journal | volume=145 | issue=3 | pages=81 | date=2013 | bibcode=2013AJ....145...81R | doi=10.1088/0004-6256/145/3/81 }}
9. ^This is the photocentric semi-major axis, from the motion shown by the observed "star" relative to distant objects, and in practice relative to the barycentre. This is always smaller than the orbital semi-major axis, dramatically smaller when the primary star is much more massive than the secondary or when it is not much brighter.
10. ^{{citation | last1=Bailer-Jones | first1=C. A. L. | title=Close encounters of the stellar kind | journal=Astronomy & Astrophysics | volume=575 | id=A35 | pages=13 | date=March 2015 | doi=10.1051/0004-6361/201425221 | bibcode=2015A&A...575A..35B | postscript=. |arxiv = 1412.3648 }}
11. ^{{citation | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
12. ^1 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R*) is given by::

References

{{reflist}}{{Stars of Orion}}

9 : K-type giants|Spectroscopic binaries|Orion (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects
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