46 Aquilae

46 Aquilae is a star in the constellation of Aquila, located to the north of Tarazed (γ Aquilae). 46 Aquilae is its Flamsteed designation. It is a dim, blue-white hued star that is a challenge to view with the naked eye, having an apparent visual magnitude of 6.33.[2] This object is located approximately 830 light years from the Sun, based on parallax.[1] It is moving closer to the Earth with a heliocentric radial velocity of −25 km/s.[2]

46 Aquilae
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension  19h 42m 12.81242s[1]
Declination 12° 11′ 35.7382″[1]
Apparent magnitude (V) 6.33[2]
Characteristics
Spectral type B9III[3]
U−B color index −0.42[4]
B−V color index −0.077±0.004[2]
Astrometry
Radial velocity (Rv)−24.7±1.6[2] km/s
Proper motion (μ) RA: −0.495[1] mas/yr
Dec.: −8.147[1] mas/yr
Parallax (π)3.9251 ± 0.0579[1] mas
Distance830 ± 10 ly
(255 ± 4 pc)
Absolute magnitude (MV)−0.32[2]
Details[5]
Luminosity179.50[2] L☉
Surface gravity (log g)3.7 cgs
Temperature12,900 K
Metallicity [Fe/H]0.50[6] dex
Rotational velocity (v sin i)1.0±0.5 km/s
Other designations
46 Aql, BD+11° 3954, GC 27263, HD 186122, HIP 96931, HR 7493, SAO 105156[3]
Database references
SIMBADdata

This body has a stellar classification of B9 III,[7] matching a late B-type giant star. It is a chemically peculiar star of a weak Mercury-Manganese type (CP3),[8] and is the most chromium–deficient star known.[9] The star may possess a magnetic field with a strength greater than 2 kG.[10] It is radiating 180[2] times the luminosity of the Sun from its photosphere at an effective temperature of 12,900 K.[5]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. "46 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-05.
  4. Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526.
  5. Bailey, J. D.; Landstreet, J. D. (2013). "Abundances determined using Si ii and Si iii in B-type stars: Evidence for stratification". Astronomy & Astrophysics. 551: A30. arXiv:1301.3050. Bibcode:2013A&A...551A..30B. doi:10.1051/0004-6361/201220671.
  6. Smith, K. C.; Dworetsky, M. M. (1993), "Elemental Abundances in Normal Late B-Stars and Hgmn-Stars from Co-Added IUE Spectra - Part One - Iron Peak Elements", Astronomy and Astrophysics, 274 (2): 335, Bibcode:1993A&A...274..335S.
  7. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  8. Ghazaryan, S.; et al. (November 2018), "New catalogue of chemically peculiar stars, and statistical analysis", Monthly Notices of the Royal Astronomical Society, 480 (3): 2953–2962, arXiv:1807.06902, Bibcode:2018MNRAS.480.2953G, doi:10.1093/mnras/sty1912.
  9. Savanov, I.; Hubrig, S. (October 2003), "Vertical distribution of chromium in the atmospheres of HgMn stars", Astronomy and Astrophysics, 410: 299–305, arXiv:astro-ph/0309562, Bibcode:2003A&A...410..299S, doi:10.1051/0004-6361:20031270.
  10. Hubrig, S.; et al. (2001), "Magnetic Field Diagnosis in HgMn Stars", in Mathys, G.; Solanki, S. K.; Wickramasinghe, D. T. (eds.), Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conference Proceedings, 248, San Francisco: Astronomical Society of the Pacific, p. 387, Bibcode:2001ASPC..248..387H, ISBN 1-58381-088-9.
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