Wolf 424
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 12h 33m 17.38s[1] |
| Declination | +09° 01′ 15.8″[1] |
| Apparent magnitude (V) | A: 13.22 ± 0.01 B: 13.21 ± 0.01[2] |
| Characteristics | |
| Spectral type | dM6e/dM6e[3] |
| U−B color index | 1.19/ |
| B−V color index | 1.84/ |
| Variable type | Flare stars |
| Astrometry | |
| Radial velocity (Rv) | −2[4] km/s |
| Proper motion (μ) | RA: −1730[5] mas/yr Dec.: +203[5] mas/yr |
| Parallax (π) | 227.90 ± 4.60[6] mas |
| Distance | 14.3 ± 0.3 ly (4.39 ± 0.09 pc) |
| Absolute magnitude (MV) | 15.03/15.02[7] |
| Orbit[2] | |
| Primary | GJ 473 A |
| Companion | GJ 473 B |
| Period (P) | 15.532 ± 0.096 yr |
| Semimajor axis (a) | 0.9257 ± 0.0049" (4.062 ± 0.098 AU) |
| Eccentricity (e) | 0.2950 ± 0.0035 |
| Inclination (i) | 103.00 ± 0.15° |
| Longitude of the node (Ω) | 143.48 ± 0.19° |
| Periastron epoch (T) | 1992.297 ± 0.056 |
| Argument of periastron (ω) (secondary) |
347.2 ± 1.5° |
| Details | |
| Mass | A: 0.143 ± 0.011 B: 0.131 ± 0.010[2] M☉ |
| Other designations | |
Wolf 424 is a binary star system comprising two red dwarf stars at a distance of approximately 14.2 light years from the Sun. It is located in the constellation Virgo, between the stars ε Virginis and δ Virginis.
The close binary nature of this star was discovered by Dutch American astronomer Dirk Reuyl in 1941, based upon an elongation of the star found in photographs.[2] The two stars in the Wolf 424 system orbit about each other with a semi-major axis of 4.1 AU and an eccentricity of 0.3. The stars have an orbital period of 15.5 years and have a combined apparent magnitude of about 12.5.
Wolf 424A is a cool main sequence red dwarf star of approximately 0.14 solar masses (147 Jupiters) and a radius of 0.17 solar radii. Its companion, Wolf 424B, is a cool main sequence red dwarf star of approximately 0.13 solar masses (136 Jupiters) and a radius of 0.14 solar radii. They are two of the dimmest objects within 15 light years of the Sun. In 1967, it was discovered that both are flare stars that undergo random increases in luminosity. The system has been designated FL Virginis, and may experience sunspot activity. The stars may undergo variation in the level of flare activity over periods lasting several years.[3]
[edit] See also
[edit] References
- ^ a b Cutri, R. M.; et al (March 2003). "2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. University of Massachusetts and Infrared Processing and Analysis Center, IPAC/California Institute of Technology. Bibcode 2003yCat.2246....0C.
- ^ a b c d Torres, Guillermo; et al (January 1999). "The Nearby Low-Mass Visual Binary Wolf 424". The Astronomical Journal 117 (1): 562–573. Bibcode 1999AJ....117..562T. doi:10.1086/300708.
- ^ a b Pettersen, B. R. (May 2006). "Flare variability in the close binary FL Vir". Monthly Notices of the Royal Astronomical Society 368 (3): 1392–1394. Bibcode 2006MNRAS.368.1392P. doi:10.1111/j.1365-2966.2006.10210.x.
- ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode 1953QB901.W495......
- ^ a b Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode 2005AJ....129.1483L. doi:10.1086/427854.
- ^ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The General Catalogue of Trigonometric [Stellar] Parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Bibcode 1995GCTP..C......0V.
- ^ Staff (January 1, 2010). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars. http://www.recons.org/TOP100.posted.htm. Retrieved 2011-07-01.
- W. D. Heintz, "Astrometric study of 4 binary stars", 1972, Astronomical Journal, 77, 160.
- Cohen, E. Richard; David R. Lide, George L. Trigg (2003). AIP Physics Desk Reference. Birkhäuser. pp. p. 100. ISBN 0387989730. http://books.google.com/books?id=JStYf6WlXpgC&pg=PA100.
[edit] External links
- Wolf 424 Data page
- Wolf 424 AB
- A NASA image of Wolf 424 AB
- Simbad
←Star systems within 10–15 light-years→ Star systems (including brown dwarf systems) within 10–15 light-years from Earth.Procyon (11.44 ± 0.02 ly; 2 stars)Tau Ceti (11.905 ± 0.007 ly; 1 star)Epsilon Eridani (10.480 ± 0.003 ly; 1 star, 2 planets: planet b • planet c) • 61 Cygni (11.40 ± 0.02 ly; 2 stars) • Epsilon Indi (11.81 ± 0.01 ly; 1 star, 2 brown dwarfs)Ross 248 (10.31 ± 0.02 ly; 1 star) • Lacaille 9352 (10.69 ± 0.02 ly; 1 star) • Ross 128 (10.94 ± 0.05 ly; 1 star) • EZ Aquarii (11.27 ± 0.17 ly; 3 stars) • Struve 2398 (11.49 ± 0.06 ly; 2 stars) • Groombridge 34 (11.65 ± 0.03 ly; 2 stars) • DX Cancri (11.83 ± 0.13 ly; 1 star) • GJ 1061 (11.99 ± 0.06 ly; 1 star) • YZ Ceti (12.12 ± 0.14 ly; 1 star) • Luyten's Star (12.25 ± 0.03 ly; 1 star) • SCR 1845-6357 (12.57 ± 0.05 ly; 1 star, 1 brown dwarf) • Teegarden's star (12.57 ± 0.04 ly; 1 star) • Kapteyn's Star (12.76 ± 0.05 ly; 1 star) • Lacaille 8760 (12.87 ± 0.04 ly; 1 star) • Kruger 60 (13.15 ± 0.07 ly; 2 stars) • Ross 614 (13.34 ± 0.05 ly; 2 stars) • Wolf 1061 (13.92 ± 0.09 ly; 1 star) • Gliese 1 (14.16 ± 0.06 ly; 1 star) • Wolf 424 (14.31 ± 0.29 ly; 2 stars: Wolf 424 A • Wolf 424 B) • TZ Arietis (14.51 ± 0.19 ly; 1 star) • Gliese 687 (14.79 ± 0.06 ly; 1 star) • LHS 292 (14.81 ± 0.25 ly; 1 star)‡ • GJ 1245 (14.81 ± 0.07 ly; 3 stars) • Gliese 674 (14.82 ± 0.09 ly; 1 star, 1 planet: planet b)DZvan Maanen's star (14.02 ± 0.11 ly; 1 star)DEN 1048-3956 (13.12 ± 0.06 ly; 1 brown dwarf)WISE 1541-2250 (9.3+4.1
−2.2 ly; 1 brown dwarf)‡ • WISE 2056+1459 (9.8+11.1
−2.0 ly; 1 brown dwarf)‡ • WISE 1738+2732 (11.1+12.7
−0 ly; 1 brown dwarf)‡ • WISE 1405+5534 (~12.4 ly; 1 brown dwarf)‡ • WISE 0410+1502 (23.2+5.2
−12.7 ly; 1 brown dwarf)‡In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems possibly located within declared distance interval, but probably not.
