Astronomy:Wolf 424

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Short description: Star in constellation of Virgo

Coordinates: Sky map 12h 33m 17.38s, +09° 01′ 15.8″

Wolf 424
Wolf 424 is located in the constellation Virgo.
Wolf 424 is located in the constellation Virgo.

Wolf 424
Location of Wolf 424 in the constellation Virgo

Observation data
Equinox J2000.0]] (ICRS)
Constellation Virgo[1]
Right ascension  12h 33m 17.38s[2]
Declination +09° 01′ 15.8″[2]
Apparent magnitude (V) A: 13.22 ± 0.01
B: 13.21 ± 0.01[3]
Characteristics
Spectral type dM6e/dM6e[4]
Variable type Flare stars[4]
Astrometry
Radial velocity (Rv)−2[5] km/s
Parallax (π)227.041 ± 0.389[6] mas
Distance14.37 ± 0.02 ly
(4.404 ± 0.008 pc)
Wolf 424 A
Proper motion (μ) RA: −1,795.661[7] mas/yr
Dec.: 217.789[7] mas/yr
Absolute magnitude (MV)15.03[8]
Wolf 424 B
Proper motion (μ) RA: −1,710.468 mas/yr
Dec.: 203.098 mas/yr
Absolute magnitude (MV)15.02[8]
Orbit[9]
PrimaryWolf 424 A
CompanionWolf 424 B
Period (P)15.804±0.026 yr
Semi-major axis (a)0.9167″±0.0017″[9]
(4.062±0.098 astronomical unit|AU)[3]
Eccentricity (e)0.301±0.002
Inclination (i)103.3±0.7°
Longitude of the node (Ω)143.5±0.1°
Periastron epoch (T)1992.297±0.056[3]
Argument of periastron (ω)
(secondary)		350.7±0.5°
Details
A
Mass0.1379±0.0023[6] M☉
Radius0.150±0.019[10] R☉
Temperature2,966±7[11] K
B
Mass0.1258±0.0022[6] M☉
Radius0.153±0.019[10] R☉
Temperature2,966±7[11] K
Other designations
FL Vir, GJ 473, Ci 20 716, G 12-43, G 60-14, LFT 923, LHS 333, LTT 13546, PLX 2890, Wolf 424, GSC 00874-00306, Cl* Melotte 25 EGG 43, USNO-B1.0 0990-00217846, VVO 74, 2E 2769, JP11 5148, JP11 5149[12]
Database references
SIMBADThe system
A
B
ARICNSA
B

Wolf 424 is a binary star system comprising two red dwarf stars. The stars are located at a distance of 14.37 light-years and hence are among the nearest stars, but due to their faint intrinsic brightness, they are not visible to the naked eye. Wolf 424 is located in the constellation Virgo, between the stars ε Virginis and ο Virginis.

Description

An ultraviolet band light curve for FL Virginis, adapted from Moffett (1972).[13] The plot shows intensity above the star's quiescent intensity.

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.[3] 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 and Wolf 424B are similar-spectrum and similar-size stars, both red dwarfs with masses of 0.138 and 0.126 M☉ and radii of 0.150 and 0.153 R☉, respectively.[10] 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.[4]

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246. 
  3. ↑ 3.0 3.1 3.2 3.3 Torres, Guillermo (January 1999). "The Nearby Low-Mass Visual Binary Wolf 424". The Astronomical Journal 117 (1): 562–573. doi:10.1086/300708. Bibcode: 1999AJ....117..562T. 
  4. ↑ 4.0 4.1 4.2 Pettersen, B. R. (May 2006). "Flare variability in the close binary FL Vir". Monthly Notices of the Royal Astronomical Society 368 (3): 1392–1394. doi:10.1111/j.1365-2966.2006.10210.x. Bibcode: 2006MNRAS.368.1392P. 
  5. ↑ 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. 
  6. ↑ 6.0 6.1 6.2 Chevalier, S. et al. (October 2023). "Binary masses and luminosities with Gaia DR3". Astronomy & Astrophysics 678: A19. doi:10.1051/0004-6361/202347111. Bibcode: 2023A&A...678A..19C. 
  7. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  8. ↑ 8.0 8.1 Staff (January 1, 2010). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars. http://www.recons.org/TOP100.posted.htm. 
  9. ↑ 9.0 9.1 Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B. et al. (2016). "The Solar Neighborhood. XXXVII. The Mass–Luminosity Relation for Main-Sequence M Dwarfs". The Astronomical Journal 152 (5): 141. doi:10.3847/0004-6256/152/5/141. Bibcode: 2016AJ....152..141B. 
  10. ↑ 10.0 10.1 10.2 Cifuentes, C.; Caballero, J. A.; González-Payo, J.; Amado, P. J.; Béjar, V. J. S.; Burgasser, A. J.; Cortés-Contreras, M.; Lodieu, N. et al. (January 2025). "CARMENES input catalogue of M dwarfs. IX. Multiplicity from close spectroscopic binaries to ultra-wide systems". Astronomy and Astrophysics 693: A228. doi:10.1051/0004-6361/202452527. ISSN 0004-6361. Bibcode: 2025A&A...693A.228C. 
  11. ↑ 11.0 11.1 Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass–Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal 158 (2): 56. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H. 
  12. ↑ "V* FL Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+FL+Vir. 
  13. ↑ Moffett, T. J. (January 1973). "Wolf 424: a neglected flare star". Monthly Notices of the Royal Astronomical Society 164: 11–20. doi:10.1093/mnras/164.1.11. Bibcode: 1973MNRAS.164...11M. 
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Further reading



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