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 |
| Distance | 640 ± 50 ly (200 ± 10 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
- 1 2 3 4 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 - 1 2 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.
- 1 2 3 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. Bibcode:2008A&A...487..689S. doi:10.1051/0004-6361:20079134.
- ↑ 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
- ↑ 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
- 1 2 3 "HD 137509". SIMBAD Astronomical Database. Retrieved 2016-04-06.
- ↑ 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.
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