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Pi1 Orionis

From Wikipedia, the free encyclopedia
Star in the constellation Orion
For other stars with thisBayer designation, seePi Orionis.
π1 Orionis
Location of π1 Orionis (circled)
Observation data
EpochJ2000.0      EquinoxJ2000.0 (ICRS)
ConstellationOrion
Right ascension04h 54m 53.72877s[1]
Declination+10° 09′ 02.9952″[1]
Apparent magnitude (V)4.74[2]
Characteristics
Spectral typeA3 Va[3]
U−Bcolor index+0.09[2]
B−Vcolor index+0.08[2]
Astrometry
Proper motion (μ)RA: +41.49[1]mas/yr
Dec.: −128.73[1]mas/yr
Parallax (π)28.04±0.25 mas[1]
Distance116 ± 1 ly
(35.7 ± 0.3 pc)
Absolute magnitude (MV)1.71±0.09[4]
Details[4]
Mass1.90+0.08
−0.09 M☉
Radius1.73±0.13 R☉
Luminosity16.91+1.42
−1.29 L☉
Surface gravity (log g)4.22+0.04
−0.05 cgs
Temperature8,900±131 K
Metallicity [Fe/H]−0.12+0.14
−0.16 dex
Rotational velocity (v sin i)120[5] km/s
Age100[6] Myr
Other designations
π1 Ori,7 Orionis,BD+09°683,HD 31295,HIP 22845,HR 1570,SAO 94201[7]
Database references
SIMBADdata

Pi1 Orionis (π1 Ori, π1 Orionis) is astar in theequatorialconstellation ofOrion. It is faintly visible to the naked eye with anapparent visual magnitude of 4.74.[2] Based upon an annualparallax shift of 28.04 mas,[1] it is located about 116 light-years from theSun.

This is anA-type main-sequence star with astellar classification of A3 Va.[3] It is aLambda Boötis star,[8] which means the spectrum shows lower-than-expected abundances forheavier elements.[9] Pi1 Orionis is a relatively young star, just 100 million years old,[6] and is spinning fairly rapidly with aprojected rotational velocity of 120 km/s.[5] It has nearly double themass of the Sun and 173% of theSun's radius. The star radiates 16.9 times thesolar luminosity from itsouter atmosphere at aneffective temperature of8,900 K.[4]

Aninfrared excess indicates there is adebris disk with a temperature of 80 K orbiting49 AU from the star. The dust has a combined mass 2.2% that of the Earth.[6]

References

[edit]
  1. ^abcdefvan Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474 (2):653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID 18759600.
  2. ^abcdMermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)",Catalogue of Eggen's UBV Data,SIMBAD,Bibcode:1986EgUBV........0M.
  3. ^abGray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample",The Astronomical Journal,132 (1):161–170,arXiv:astro-ph/0603770,Bibcode:2006AJ....132..161G,doi:10.1086/504637,S2CID 119476992.
  4. ^abcMurphy, S. J.; Paunzen, E.; Bedding, T. R.; Walczak, P.; Huber, D. (2020-06-01)."The pulsation properties of λ bootis stars I. the southern TESS sample".Monthly Notices of the Royal Astronomical Society.495 (2):1888–1912.arXiv:2005.09187.Bibcode:2020MNRAS.495.1888M.doi:10.1093/mnras/staa1271.ISSN 0035-8711.
  5. ^abRoyer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions",Astronomy and Astrophysics,463 (2):671–682,arXiv:astro-ph/0610785,Bibcode:2007A&A...463..671R,doi:10.1051/0004-6361:20065224,S2CID 18475298.
  6. ^abcRhee, Joseph H.; et al. (May 2007), "Characterization of Dusty Debris Disks: The IRAS and Hipparcos Catalogs",The Astrophysical Journal,660 (2):1556–1571,arXiv:astro-ph/0609555,Bibcode:2007ApJ...660.1556R,doi:10.1086/509912,S2CID 11879505.
  7. ^"* pi.01 Ori".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2016-11-15.{{cite web}}: CS1 maint: postscript (link)
  8. ^Gray, R. O.; Corbally, C. J. (August 1993), "A search for Lambda Bootis stars in OB associations",Astronomical Journal,106 (2):632–636,Bibcode:1993AJ....106..632G,doi:10.1086/116668.
  9. ^Kamp, I.; et al. (April 2008), "λ Bootis stars: Current status and new insights from Spitzer",Contributions of the Astronomical Observatory Skalnaté Pleso,38 (2):147–156,Bibcode:2008CoSka..38..147K.
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