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PP Carinae

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This article is about p Carinae. For P Carinae, seeV399 Carinae.
PP Carinae
Location of PP Carinae (circled)
Observation data
EpochJ2000.0EquinoxJ2000.0
Constellation Carina
Right ascension 10h32m01.46297s[1]
Declination –61° 41′ 07.1963″[1]
Apparent magnitude(V) 3.22 - 3.55[2]
Characteristics
Spectral type B4 Vne[3]
U−Bcolor index –0.71[4]
B−Vcolor index –0.11[4]
Variable type γ Cas[2]
Astrometry
Radial velocity(Rv)+26.0[5]km/s
Proper motion(μ)RA:–17.01[1]mas/yr
Dec.:+11.50[1]mas/yr
Parallax(π)6.75 ± 0.40mas[1]
Distance480 ± 30ly
(148 ± 9pc)
Absolute magnitude(MV)−2.684[6]
Details
Mass7.6 ± 0.1[7]M☉
Radius6.0[8]R☉
Luminosity5,212[6]L☉
Surface gravity(logg)3.52[8]cgs
Temperature19,291[6]K
Rotational velocity(vsini)325[9]km/s
Age39.8 ± 7.6[7]Myr
Other designations
pCarinae,PPCarinae,CP−61°1704,FK5397,HD91465,HIP51576,HR4140,SAO251006
Database references
SIMBADdata

p Carinaeis theBayer designationof astarin the southernconstellationofCarina.It has thevariable star designationPP Carinaeand, at anapparent visual magnitudeof +3.3,[5]is readily visible to the naked eye from the southern hemisphere. From the observedparallaxshift of this star as the Earth orbits the Sun, its distance can be estimated as roughly 480light-years(150parsecs) with a 6%margin of error.[1]It is considered to be a member of theopen clusterIC 2602although it lies well outside the core visible group of stars.[6]

Alight curvefor PP Carinae, plotted fromTESSdata[10]

The star is aB-type main sequence starwith astellar classificationof B4 Vne.[3]The 'ne' suffix indicates it is a rapidly rotatingBe starthat is surrounded by hot circumstellar gas. This material addsemission linesto thespectrumof the star. It has aprojected rotational velocityof325 km s−1,[9]with about 7.6[7]times the mass and 6[8]times the radius of the Sun. This star is classified as aGamma Cassiopeiae-typevariableand its brightness varies from magnitude +3.22 to +3.55.[2]

In most versions of its asterism, the neighbouring bright stars, thus plotted along the imaginary hull forming Carina areTheta Carinae,to the south, andV337 (also known as lower case q) Carinaeto the east, of second and third magnitude respectively.

References

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  1. ^abcdefvan Leeuwen, F. (November 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,S2CID18759600.
  2. ^abcOtero, Sebastian Alberto (15 April 2012)."VSX: Detail for PP Carinae".The International Variable Star Index.American Association of Variable Star Observers.Retrieved2018-01-05.
  3. ^abHouk, Nancy (1978), "Michigan catalogue of two dimensional spectral types for the HD stars",University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0,1,Ann Arbor: Dept. of Astronomy, University of Michigan,Bibcode:1975mcts.book.....H.
  4. ^abFeinstein, A.; Marraco, H. G. (November 1979), "The photometric behavior of Be Stars",Astronomical Journal,84:1713–1725,Bibcode:1979AJ.....84.1713F,doi:10.1086/112600.
  5. ^abWielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions",Veröff. Astron. Rechen-Inst. Heidelb,35(35), Astronomisches Rechen-Institut Heidelberg: 1,Bibcode:1999VeARI..35....1W.
  6. ^abcdSilaj, J; Landstreet, J. D (2014). "Accurate age determinations of several nearby open clusters containing magnetic Ap stars".Astronomy & Astrophysics.566:A132.arXiv:1407.4531.Bibcode:2014A&A...566A.132S.doi:10.1051/0004-6361/201321468.S2CID53370832.
  7. ^abcTetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun",Monthly Notices of the Royal Astronomical Society,410(1): 190–200,arXiv:1007.4883,Bibcode:2011MNRAS.410..190T,doi:10.1111/j.1365-2966.2010.17434.x,S2CID118629873.
  8. ^abcMeilland, A.; Stee, Ph.; Chesneau, O.; Jones, C. (October 2009), "VLTI/MIDI observations of 7 classical Be stars",Astronomy and Astrophysics,505(2): 687–693,arXiv:0908.1239,Bibcode:2009A&A...505..687M,doi:10.1051/0004-6361/200911960,S2CID12694072.
  9. ^abBernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities",Contributi Osservatorio Astronomico di Padova in Asiago,239(1),Bibcode:1970CoAsi.239....1B.
  10. ^"MAST: Barbara A. Mikulski Archive for Space Telescopes".Space Telescope Science Institute.Retrieved8 December2021.
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