HD 137509

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HD 137509
Observation data
Epoch J2000      Equinox J2000
Constellation Apus
Right ascension  15h 31m 27.11664s [1]
Declination −71° 03′ 43.6541″ [1]
Apparent magnitude (V) 6.87 [2]
Characteristics
Spectral type B9p (SiCrFe) [3]
B−V color index -0.11 [4]
Astrometry
Radial velocity (Rv)+0.50[5] km/s
Proper motion (μ) RA: -16.08[6] mas/yr
Dec.: -14.64[6] mas/yr
Parallax (π)5.11 ± 0.38[1] mas
Distance640 ± 50 ly
(200 ± 10 pc)
Other designations
GC 20810, CD−70° 1302, HIP 76011, HD 137509, SAO 257290 [6]
Database references
SIMBADdata

HD 137509, also known as NN Apodis, is a class B9p[3] star in the constellation Apus. Its apparent magnitude is 6.87[2] and it is approximately 640 light years away based on parallax.[1] It shines with a luminosity approximately 111 times that of the Sun and has a surface temperature of 12804 K.[7] It has one of the strongest magnetic fields recorded for a chemically peculiar star.[3]

References[edit]

  1. ^ a b c d 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. Vizier catalog entry
  2. ^ a b Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D.
  3. ^ a b c Shulyak, D.; Kochukhov, O.; Khan, S. (2008). "Model atmospheres of magnetic chemically peculiar stars. A remarkable strong-field Bp SiCrFe star HD 137509". Astronomy and Astrophysics. 487 (2): 689–96. arXiv:0806.1296. Bibcode:2008A&A...487..689S. doi:10.1051/0004-6361:20079134.
  4. ^ Høg, E.; et al. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862
  5. ^ Barbier-Brossat, M.; Petit, M.; Figon, P. (December 1994), "Third bibliographic catalogue of stellar radial velocities", Astronomy and Astrophysics Supplement, 108: 603–609, Bibcode:1994A&AS..108..603B
  6. ^ a b c "HD 137509". SIMBAD Astronomical Database. Retrieved 2016-04-06.
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (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.