Summary
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]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[1] |
| 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 |
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 edit
- ^ a b c d 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.
- ^ a b c d Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
- ^ a b c d e 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.
- ^ a b 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.
- ^ a b van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c 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 c Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ a b Adelman, S. J.; et al. (June 2017), "Elemental abundance analyses with DAO spectrograms: XL", Astronomische Nachrichten, 338 (5): 584–597, Bibcode:2017AN....338..584A, doi:10.1002/asna.201613214.
- ^ "4 Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 27, 2018.
- ^ Hoffleit, D.; Warren Jr., W. H. (1991), "The Bright Star Catalogue", New Haven (5th Revised [Preliminary Version] ed.), 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, Bibcode:1988MNRAS.235..763A, doi:10.1093/mnras/235.3.763.
External links edit
- HR 7664
- Image 14 Sagittae