Astronomy:14 Sagittae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 03m 30.01519s[1] |
| Declination | +16° 01′ 52.5065″[1] |
| Apparent magnitude (V) | 5.89[2] |
| Characteristics | |
| Spectral type | B9p HgMn[3] |
| U−B color index | –0.44[2] |
| B−V color index | –0.06[2] |
| Astrometry | |
| Radial velocity (Rv) | –21.7[4] km/s |
| Proper motion (μ) | RA: +5.28[5] mas/yr Dec.: –8.99[5] mas/yr |
| Parallax (π) | 4.9142 ± 0.0849[1] mas |
| Distance | 660 ± 10 ly (203 ± 4 pc) |
| Absolute magnitude (MV) | −0.72[6] |
| Orbit[7] | |
| Period (P) | 61.541 d |
| Eccentricity (e) | 0.49 |
| Periastron epoch (T) | 2440799.01 JD |
| Argument of periastron (ω) (secondary) | 345° |
| Semi-amplitude (K1) (primary) | 4.2 km/s |
| Details | |
| 14 Sge A | |
| Luminosity | 291.53[6] L☉ |
| Surface gravity (log g) | 3.60[3] cgs |
| Temperature | 13,200[3] K |
| Rotational velocity (v sin i) | 7.0±0.5[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
14 Sagittae is a binary star[7] system in the equatorial constellation of Aquila.[10] 14 Sagittae is the Flamsteed designation. It appears as a sixth magnitude star, near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 5.89.[2] The system is located 660 light years away, as determined from its annual parallax shift of 4.91 mas.[1] It is moving closer to the Earth with a heliocentric radial velocity of –22 km/s.[4]
This is a single-lined spectroscopic binary with an orbital period of 61.5 days and an eccentricity of 0.49.[7] The visible component is a chemically peculiar mercury-manganese star[11] with a stellar classification of B9p HgMn.[3] It is narrow-lined with a projected rotational velocity of 7 km/s.[8] The star is radiating 292[6] times the Sun's luminosity from its photosphere at an effective temperature of 13,200 K.[3]
References
- ↑ 1.0 1.1 1.2 1.3 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.
- ↑ 2.0 2.1 2.2 2.3 Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series 52: 7–22, doi:10.1086/190856, Bibcode: 1983ApJS...52....7F.
- ↑ 3.0 3.1 3.2 3.3 3.4 Smith, K. C.; Dworetsky, M. M. (July 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.
- ↑ 4.0 4.1 Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
- ↑ 5.0 5.1 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 Pourbaix, D. et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics 424: 727–732, doi:10.1051/0004-6361:20041213, Bibcode: 2004A&A...424..727P.
- ↑ 8.0 8.1 Adelman, S. J. et al. (June 2017), "Elemental abundance analyses with DAO spectrograms: XL", Astronomische Nachrichten 338 (5): 584–597, doi:10.1002/asna.201613214, Bibcode: 2017AN....338..584A.
- ↑ "4 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=4+Aql.
- ↑ Hoffleit, D.; Warren Jr., W. H. (1991), "The Bright Star Catalogue", New Haven (Astronomical Data Center, NSSDC/ADC), Bibcode: 1964cbs..book.....H.
- ↑ Adelman, S. J. (December 1988), "Elemental Abundance Analyses with Coadded DAO Spectrograms - Part Five - the Mercury-Manganese Stars Phi-Herculis 28-HERCULIS and HR:7664", Monthly Notices of the Royal Astronomical Society 235 (3): 763, doi:10.1093/mnras/235.3.763, Bibcode: 1988MNRAS.235..763A.
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