Astronomy:46 Aquilae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 "46 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=46+Aql.
- ↑ Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal 137: 530, doi:10.1086/147526, Bibcode: 1963ApJ...137..530C.
- ↑ 5.0 5.1 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. doi:10.1051/0004-6361/201220671. Bibcode: 2013A&A...551A..30B.
- ↑ 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, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
- ↑ 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, doi:10.1093/mnras/sty1912, Bibcode: 2018MNRAS.480.2953G.
- ↑ Savanov, I.; Hubrig, S. (October 2003), "Vertical distribution of chromium in the atmospheres of HgMn stars", Astronomy and Astrophysics 410: 299–305, doi:10.1051/0004-6361:20031270, Bibcode: 2003A&A...410..299S.
- ↑ Hubrig, S. et al. (2001), "Magnetic Field Diagnosis in HgMn Stars", in Mathys, G.; Solanki, S. K.; Wickramasinghe, D. T., Magnetic Fields Across the Hertzsprung-Russell Diagram, ASP Conference Proceedings, 248, San Francisco: Astronomical Society of the Pacific, p. 387, ISBN 1-58381-088-9, Bibcode: 2001ASPC..248..387H.
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