Astronomy:19 Aquilae
 Image captured from Mount Laguna, California | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 19h 08m 59.90684s[1] |
| Declination | +06° 04′ 23.4857″[1] |
| Apparent magnitude (V) | 5.227[2] |
| Characteristics | |
| Spectral type | F0 III-IV[3] |
| Apparent magnitude (U) | 5.59±0.010[4] |
| Apparent magnitude (B) | 5.57±0.007[5] |
| Apparent magnitude (V) | 5.23±0.009[5] |
| U−B color index | +0.020[2] |
| B−V color index | +0.345[2] |
| Variable type | suspected γ Dor[6] |
| Astrometry | |
| Radial velocity (Rv) | −46.7[7] km/s |
| Proper motion (μ) | RA: −5.485[1] mas/yr Dec.: −73.785[1] mas/yr |
| Parallax (π) | 22.9563 ± 0.2397[1] mas |
| Distance | 142 ± 1 ly (43.6 ± 0.5 pc) |
| Absolute magnitude (MV) | 1.94[8] |
| Details | |
| Mass | 1.54[9] M☉ |
| Radius | 2.50+0.25 −0.05[1] R☉ |
| Luminosity | 12.8±0.2[1] L☉ |
| Surface gravity (log g) | 4.13[3] cgs |
| Temperature | 6,784±53[9] K |
| Metallicity [Fe/H] | +0.03[3] dex |
| Rotational velocity (v sin i) | 57.0[10] km/s |
| Age | 2.25[9] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
19 Aquilae is a single[12] star located 142 light-years (44 parsecs) away from the Sun in the equatorial constellation of Aquila. 19 Aquilae is the Flamsteed designation. It is visible to the naked eye as a dim, yellow-white hued star with an apparent visual magnitude of 5.23.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −46.7 km/s.[7]
This object has a stellar classification of F0 III-IV,[3] with the luminosity class matching an evolving star transitioning from the subgiant to a giant stage. Poretti et al. (2003) list it as a suspected Gamma Doradus variable, and it is located near the cooler end of the instability strip on the Hertzsprung–Russell diagram.[6] These spatial coordinates are a source of X-ray emission, which is most likely coming from the star.[13]
19 Aquilae is an estimated 2.25[9] billion years old with a moderately high rate of spin, showing a projected rotational velocity of 57.0 km/s.[10] It has 1.54[9] times the mass of the Sun and 2.50[1] times the Sun's radius. The star is radiating 12.8[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,784 K.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 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 Oja, T. (1986). "UBV photometry of stars whose positions are accurately known. III". Astronomy and Astrophysics Supplement Series 65 (2): 405–4. Bibcode: 1986A&AS...65..405O.
- ↑ 3.0 3.1 3.2 3.3 Balachandran, Suchitra (May 1, 1990). "Lithium depletion and rotation in main-sequence stars". Astrophysical Journal, Part 1 354: 310–332. doi:10.1086/168691. Bibcode: 1990ApJ...354..310B.
- ↑ Oja, T. (1984). "UBV photometry of stars whose positions are accurately known". Astronomy and Astrophysics Supplement Series 57: 357. Bibcode: 1984A&AS...57..357O.
- ↑ 5.0 5.1 Oja, T. (September 1993). "UBV photometry of stars whose positions are accurately known. VII". Astronomy and Astrophysics Supplement Series 100 (3): 591–592. ISSN 0365-0138. Bibcode: 1993A&AS..100..591O.
- ↑ 6.0 6.1 Poretti, E. et al. (2003). "Preparing the COROT space mission: Incidence and characterisation of pulsation in the lower instability strip". Astronomy and Astrophysics 406: 203–211. doi:10.1051/0004-6361:20030711. Bibcode: 2003A&A...406..203P.
- ↑ 7.0 7.1 Wielen, R. et al. (1999). "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions". Veröffentlichungen Astronomisches Rechen-Institut Heidelberg (Astronomisches Rechen-Institut Heidelberg) 35 (35): 1. Bibcode: 1999VeARI..35....1W.
- ↑ Holmberg, J. et al. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics 501 (3): 941–947. doi:10.1051/0004-6361/200811191. Bibcode: 2009A&A...501..941H.
- ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L.
- ↑ 10.0 10.1 Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo", Astronomy and Astrophysics 493 (3): 1099–1107, doi:10.1051/0004-6361:200810377, Bibcode: 2009A&A...493.1099S, http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2[yes|permanent dead link|dead link}}]
- ↑ "19 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=19+Aql.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009). "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources". The Astrophysical Journal Supplement 184 (1): 138–151. doi:10.1088/0067-0049/184/1/138. Bibcode: 2009ApJS..184..138H.
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