HD 173417 is a single[9] star in the northern constellation of Lyra. It is dimly visible to the naked eye with an apparent visual magnitude of 5.68,[2] positioned about two degrees to the southwest of the bright star Sheliak.[10] The distance to this star is approximately 169 light years based on parallax measurements, and it is slowly drifting closer with a radial velocity of −3 km/s.[1]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 43m 51.59217s[1] |
| Declination | +31° 55′ 35.8058″[1] |
| Apparent magnitude (V) | 5.68[2] |
| Characteristics | |
| Spectral type | F1III-IV[3] |
| B−V color index | +0.360±0.004[2] |
| Variable type | Constant[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.26±0.57[1] km/s |
| Proper motion (μ) | RA: −32.768[1] mas/yr Dec.: −125.812[1] mas/yr |
| Parallax (π) | 19.27 ± 0.60 mas[1] |
| Distance | 169 ± 5 ly (52 ± 2 pc) |
| Absolute magnitude (MV) | 2.17[5] |
| Details | |
| Mass | 1.60[6] M☉ |
| Radius | 2.243[2] R☉ |
| Luminosity | 10.407[2] L☉ |
| Surface gravity (log g) | 3.91[6] cgs |
| Temperature | 6,928[2] K |
| Metallicity [Fe/H] | −0.21[6] dex |
| Rotational velocity (v sin i) | 53.9±2.7[7] km/s |
| Age | 1.70[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of this star is F1III-IV,[3] matching an evolving star with the mixed luminosity traits of a subgiant and giant star. It is 1.7 billion years old with a low metallicity and a relatively high projected rotational velocity of 54 km/s.[7] The star has 1.6[6] times the mass of the Sun and 2.2 times the Sun's radius. It is radiating over 10 times the luminosity of the Sun from its photosphere at an effective temperature of 6,928 K.[2]
References
edit- ^ a b c d e f g 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 Schofield, Mathew; et al. (2019), "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite", The Astrophysical Journal Supplement Series, 241 (1): 12, arXiv:1901.10148, Bibcode:2019ApJS..241...12S, doi:10.3847/1538-4365/ab04f5, S2CID 119481586.
- ^ a b Cowley, Anne; Fraquelli, Dorothy (February 1974), "MK Spectral Types for Some Bright F Stars", Publications of the Astronomical Society of the Pacific, 86 (509): 70, Bibcode:1974PASP...86...70C, doi:10.1086/129562, S2CID 120236647.
- ^ Breger, M.; et al. (May 1981), "A Search for Maia Variables", Information Bulletin on Variable Stars, 1966: 1, Bibcode:1981IBVS.1966....1B.
- ^ 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 d e Casagrande, L.; et al. (June 1, 2011), "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey", Astronomy and Astrophysics, 530: A138, arXiv:1103.4651, Bibcode:2011A&A...530A.138C, doi:10.1051/0004-6361/201016276, ISSN 0004-6361, S2CID 56118016.
- ^ a b Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707.
- ^ "HD 173417". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 16, 2007.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1175, ISBN 0-933346-84-0.