Pi Tucanae Star in the constellation Tucana
Pi Tucanae (π Tuc, π Tucanae) is a double star [ 6] constellation of Tucana . It is visible to the naked eye with a combined apparent visual magnitude of +5.49.[ 2] parallax shift of 10.25 mas as seen from Earth, it is located around 317 light years from the Sun .
The brighter star, component A, is a B-type main sequence star with a stellar classification of B9 V.[ 4] [ 7] projected rotational velocity of 236.[ 9] [ 7] mass of the Sun and radiates 59[ 8] solar luminosity from its photosphere at an effective temperature of 11,393 K.[ 7]
There is a nearby visual companion, component B, but the two stars may not form a physical pair. This star has a K-band magnitude of 10.1 and is a source of X-ray emission . It has 60% of the Sun's mass and just 6.3% of the Sun's luminosity, with an effective temperature of 3,890 K.[ 6] arc seconds along a position angle of 211.4°, which corresponds to a projected separation of 214.1 AU .[ 6]
Notes
↑ calculated using temperature and luminosity
References
1 2 3 4 5 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 . 1 2 3 4 Cousins, A. W. J.; Lagerweij, H. C. (1971), "UBV Observations of Variable Stars", Monthly Notes of the Astronomical Society of Southern Africa , 30 : 12, Bibcode :1971MNSSA..30...12C . ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics . 537 : A120. arXiv :1201.2052 Bibcode :2012A& A...537A.120Z . doi :10.1051/0004-6361/201117691 . 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H . ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics , 546 : 14, arXiv :1208.3048 Bibcode :2012A& A...546A..61D , doi :10.1051/0004-6361/201219219 , S2CID 59451347 , A61. 1 2 3 4 5 6 7 8 Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics , 372 (1): 152– 164, arXiv :astro-ph/0103201 Bibcode :2001A& A...372..152H , doi :10.1051/0004-6361:20010452 , S2CID 17507782 . 1 2 3 4 5 6 7 Gullikson, Kevin; et al. (August 2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal , 152 (2): 13, arXiv :1604.06456 Bibcode :2016AJ....152...40G , doi :10.3847/0004-6256/152/2/40 S2CID 119179065 , 40. 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343– 57, arXiv :1208.2037 Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x S2CID 118665352 . 1 2 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 . ↑ "pi. Tuc -- Double or multiple star" , SIMBAD Astronomical Database , Centre de Données astronomiques de Strasbourg, retrieved 2017-04-20 .
