RR Lyncis is a star system in the northern constellation of Lynx, abbreviated RR Lyn. It is an eclipsing binary of the Algol type;[5] one of the closest in the northern sky[10] at an estimated distance of approximately 263 light years based on parallax measurements.[1] The system is faintly visible to the naked eye with a combined apparent visual magnitude of 5.53.[2] During the primary eclipse the brightness drops to 6.03, while it decreases to magnitude 5.90 with the secondary eclipse.[5] The system is drifting closer to the Sun with a radial velocity of −12 km/s.[6]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lynx |
| Right ascension | 06h 26m 25.837s[1] |
| Declination | +56° 17′ 06.35″[1] |
| Apparent magnitude (V) | 5.53[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | kA3hA7VmF2[3] + F0 V[4] |
| B−V color index | 0.238±0.013[2] |
| Variable type | Detached Algol[5] |
| Astrometry | |
| Radial velocity (Rv) | −12.03±0.04[6] km/s |
| Proper motion (μ) | RA: −26.232 mas/yr[1] Dec.: +21.881 mas/yr[1] |
| Parallax (π) | 12.4161 ± 0.0918 mas[1] |
| Distance | 263 ± 2 ly (80.5 ± 0.6 pc) |
| Absolute magnitude (MV) | 1.16[2] |
| Orbit[7] | |
| Period (P) | 9.945080±0.000059 d |
| Semi-major axis (a) | 29.32±0.04 R☉ |
| Eccentricity (e) | 0.0793±0.0009 |
| Inclination (i) | 87.45±0.11° |
| Periastron epoch (T) | 2,453,334,634±0.017 HJD |
| Argument of periastron (ω) (secondary) | 179.4±0.6° |
| Semi-amplitude (K1) (primary) | 65.65±0.06 km/s |
| Semi-amplitude (K2) (secondary) | 83.92±0.17 km/s |
| Details[4] | |
| Primary | |
| Mass | 1.939±0.007 M☉ |
| Radius | 2.564±0.019 R☉ |
| Luminosity | 21.6 L☉ |
| Surface gravity (log g) | 3.9078±0.0063 cgs |
| Temperature | 7,770±200 K |
| Rotational velocity (v sin i) | 14.6±1[7] km/s |
| Age | 1.08±0.15[7] Gyr |
| Secondary | |
| Mass | 1.510±0.003 M☉ |
| Radius | 1.613±0.013 R☉ |
| Luminosity | 6.23 L☉ |
| Surface gravity (log g) | 4.2017±0.0071 cgs |
| Temperature | 7,180±200 K |
| Rotational velocity (v sin i) | 11.3±2[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This star was found to have a variable radial velocity by W. S. Adams, based on measurements taken in 1911, which suggested it is a spectroscopic binary system. At the time it was identified as Boss 1607 and Groom 1149.[9] Orbital elements for the binary were first published in 1915 by W. E. Harper.[12] In 1931, C. M. Huffer determined Boss 1607 to be an eclipsing binary, based on a light curve generated using photoelectric measurements. This showed a period of 9.9450 days with a magnitude difference of 1.20 between the components.[13] N. G. Roman in 1949 found this to be a metallic-line star and a possible member of the Ursa Major stream.[14]
In 1960, C. and M. Jaschek published a spectral analysis of RR Lyn that showed hydrogen lines for a star of type A7, a K-line of type A3, and metallic lines of type F0 or cooler.[15] Kh. F. Khaliullin and A. I. Khaliullina in 2002 found that the timing of the primary and secondary eclipses underwent quasi-period oscillations. This may be explained by a third body with a mass 90% of the Sun in orbit with the pair. However, as of 2006 the presence of this object has not been confirmed through spectroscopic measurement.[10]
This is a detached double-lined spectroscopic binary with an orbital period of 9.95 days and a small eccentricity. The orbital plane is inclined at an angle of 87.5°, so both stars are seen to eclipse each other once per orbit. The primary component is a slightly-evolved Am star with 1.9 times the mass and 2.6 times the radius of the Sun. The secondary is an F-type main-sequence star with 1.5 times the mass of the Sun and 1.6 times the Sun's radius. The system exhibits pulsation behavior, most of which is attributed to the secondary. The higher frequency modes are Delta Scuti-type pulsations, while the intermediate frequencies are of the Gamma Doradus type. Lower frequency pulsations may be tidally-excited.[4] The system is about one billion years old.[7]
References
edit- ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d 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.
- ^ Levato, H.; Abt, H. A. (August 1978), "Spectral types in the Ursa Major stream", Publications of the Astronomical Society of the Pacific, 90: 429−433, Bibcode:1978PASP...90..429L, doi:10.1086/130352.
- ^ a b c Southworth, J. (December 2021), "Rediscussion of eclipsing binaries. Paper 7: Delta Scuti, Gamma Doradus, and tidally-perturbed pulsations in RR Lyncis", The Observatory, 141: 282–295, arXiv:2109.10196, Bibcode:2021Obs...141..282S.
- ^ a b c Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
- ^ a b Pourbaix, D.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy and Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ a b c d e Tomkin, Jocelyn; Fekel, Francis C. (May 2006), "New Precision Orbits of Bright Double-Lined Spectroscopic Binaries. I. RR Lyncis, 12 Bootis, and HR 6169", The Astronomical Journal, 131 (5): 2652–2663, arXiv:astro-ph/0601716, Bibcode:2006AJ....131.2652T, doi:10.1086/501349, S2CID 119522198.
- ^ "RR Lyn". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-07-18.
- ^ a b Adams, W. S. (April 1912), "The three-prism stellar spectrograph of the Mount Wilson Solar Observatory.", Astrophysical Journal, 35: 163–182, Bibcode:1912ApJ....35..163A, doi:10.1086/141924.
- ^ a b Bensch, Katarzyna; et al. (December 2014), "New spectroscopy of multiple stars RR Lyncis and HT Virginis", Information Bulletin on Variable Stars, 6121: 1, Bibcode:2014IBVS.6121....1B.
- ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
- ^ Popper, Daniel M. (November 1971), "Some Double-Lined Eclipsing Binaries with Metallic-Line Spectra", Astrophysical Journal, 169: 549, Bibcode:1971ApJ...169..549P, doi:10.1086/151173.
- ^ Huffer, C. M. (1931), Fox, Philip; Stebbins, Joel (eds.), "Report on photo-electric studies", Publications of the American Astronomical Society, 6, AAS: 365, Bibcode:1931PAAS....6R.365H.
- ^ Roman, Nancy Grace (September 1949), "The Ursa Major Group", Astrophysical Journal, 110: 205, Bibcode:1949ApJ...110..205R, doi:10.1086/145199.
- ^ Jaschek, M.; Jaschek, C. (1960), "A Search for Families among Metallic-Line Stars", Zeitschrift für Astrophysik, 50: 155, Bibcode:1960ZA.....50..155J.
Further reading
edit- Lloyd, Christopher (July 2022), "The eclipse timings of RR Lyncis", eprint arXiv, arXiv:2207.03215, Bibcode:2022arXiv220703215L.
- Jeong, Yeuncheol; et al. (June 2017), "Chemical Composition of RR Lyn - an Eclipsing Binary System with Am and λ Boo Type Components", Journal of Astronomy and Space Sciences, 34 (2): 75–82, Bibcode:2017JASS...34...75J, doi:10.5140/JASS.2017.34.2.75.
- Khaliullin, Kh. F.; Khaliullina, A. I. (February 2002), "The Third Body in the Eclipsing System RR Lyn", Astronomy Reports, 46 (2): 119–126, Bibcode:2002ARep...46..119K, doi:10.1134/1.1451925, S2CID 120740334.
- Khaliullin, Kh. F.; et al. (November 2001), "Precision W BV R photoelectric photometry of the eclipsing system RR Lyncis", Astronomy Reports, 45 (11): 888–898, Bibcode:2001ARep...45..888K, doi:10.1134/1.1416278, S2CID 121293179.
- Kondo, M. (1976), "The system of RR Lyncis", Tokyo Astronomical Observatory, Annals, Second Series, vol. 16, no. 1, Tokyo University, pp. 1–21, Bibcode:1976AnTok..16....1K.
- Botsula, R. A. (1971), "RR Lyncis", Peremennye Zvezdy (in Russian), 18: 71–83, Bibcode:1971PZ.....18...71B.
- Linnell, A. P. (August 1966), "UBV photometry of RR Lyncis", Astronomical Journal, 71: 458–476, Bibcode:1966AJ.....71..458L, doi:10.1086/109950.