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For other stars with this Bayer designation, see Pi Orionis.
π1 Orionis
Location of π1 Orionis (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Orion
Right ascension 04h 54m 53.72877s [1]
Declination +10° 09′ 02.9952″ [1]
Apparent magnitude (V) 4.74 [2]
Characteristics
Spectral type A3 Va [3]
U−B color index +0.09 [2]
B−V color 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)1.76±0.08 [4]
Details
Mass1.97±0.07 [4]  M☉
Radius1.67 [5]  R☉
Luminosity16.6 [5]  L☉
Surface gravity (log g)4.15 [3]  cgs
Temperature8,611 [3]  K
Metallicity [Fe/H]−1.24 [3]  dex
Rotational velocity (v sin i)120 [6] km/s
Age100 [5]  Myr
Other designations
π1 Ori, 7 Orionis, BD+09°683, HD 31295, HIP 22845, HR 1570, SAO 94201 [7]
Database references
SIMBAD data

Pi1 Orionis (π1 Ori, π1 Orionis) is a star in the equatorial constellation of Orion. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74. [2] Based upon an annual parallax shift of 28.04  mas, [1] it is located about 116  light-years from the Sun.

This is an A-type main-sequence star with a stellar classification of A3 Va. [3] It is a Lambda Boötis star, [8] which means the spectrum shows lower-than-expected abundances for heavier elements. [9] Pi1 Orionis is a relatively young star, just 100 million years old, [5] and is spinning fairly rapidly with a projected rotational velocity of 120 km/s. [6] It has nearly double [4] the mass of the Sun and 167% of the Sun's radius. The star radiates 16.6 [5] times the solar luminosity from its outer atmosphere at an effective temperature of 8,611  K. [3]

An infrared excess indicates there is a debris disk with a temperature of 80 K orbiting 49  AU from the star. The dust has a combined mass 2.2% that of the Earth. [5]

References

  1. ^ a b c d e f van 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. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode: 1986EgUBV........0M.
  3. ^ a b c d e f Gray, 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. ^ a b c Gerbaldi, M.; et al. (June 1999), "Search for reference A0 dwarf stars: Masses and luminosities revisited with HIPPARCOS parallaxes", Astronomy and Astrophysics Supplement, 137 (2): 273–292, Bibcode: 1999A&AS..137..273G, doi: 10.1051/aas:1999248.
  5. ^ a b c d e f Rhee, 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.
  6. ^ a b Royer, 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.
  7. ^ "* pi.01 Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-11-15.{{ 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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