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]
| 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 mas[1] |
| Distance | 830 ± 10 ly (255 ± 4 pc) |
| Absolute magnitude (MV) | −0.32[2] |
| Details[5] | |
| Luminosity | 179.50[2] L☉ |
| Surface gravity (log g) | 3.7 cgs |
| Temperature | 12,900 K |
| Metallicity [Fe/H] | 0.50[6] dex |
| Rotational velocity (v sin i) | 1.0±0.5 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ a b c d e f 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.
- ^ a b c d e f g h 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, S2CID 119257644.
- ^ a b "46 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-05.
- ^ 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.
- ^ a b 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. S2CID 59291051.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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, S2CID 14487812.
- ^ 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, vol. 248, San Francisco: Astronomical Society of the Pacific, p. 387, Bibcode:2001ASPC..248..387H, ISBN 1-58381-088-9.