Wolf 424

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Wolf 424
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Wolf 424
Location of Wolf 424 in the constellation Virgo

Observation data
Epoch J2000       Equinox J2000
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  mas [6]
Distance 14.37 ± 0.02  ly
(4.404 ± 0.008  pc)
Wolf 424 A
Proper motion (μ)RA: −1,795.661 mas/yr [7]
Dec.: 217.789 mas/yr [7]
Absolute magnitude  (MV)15.03 [8]
Wolf 424 B
Proper motion (μ)RA: −1,710.468 mas/yr [9]
Dec.: 203.098 mas/yr [9]
Absolute magnitude  (MV)15.02 [8]
Orbit [10]
PrimaryWolf 424 A
CompanionWolf 424 B
Period (P)15.804±0.026 yr
Semi-major axis (a)0.9167″ ±0.0017″ [10]
(4.062±0.098  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
Mass 0.1379±0.0023 [6]   M☉
Radius 0.150±0.019 [11]   R☉
Temperature 2,966±7 [12]   K
B
Mass 0.1258±0.0022 [6]   M☉
Radius 0.153±0.019 [11]   R☉
Temperature 2,966±7 [12]   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, GCRV 7553, GSC 00874-00306, Cl* Melotte 25 EGG 43, USNO-B1.0 0990-00217846, VVO 74, 2E 2769, JP11 5148, JP11 5149 [13]
Database references
SIMBAD The system
A
B
ARICNS A
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.

Contents

Description

An ultraviolet band light curve for FL Virginis, adapted from Moffett (1972). The plot shows intensity above the star's quiescent intensity. FLVirLightCurve.png
An ultraviolet band light curve for FL Virginis, adapted from Moffett (1972). 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. [11] 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. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (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. S2CID   115529446.
  3. 1 2 3 4 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 .
  4. 1 2 3 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 .
  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. 1 2 3 Chevalier, S.; Babusiaux, C.; et al. (October 2023). "Binary masses and luminosities with Gaia DR3". Astronomy & Astrophysics . 678: A19. arXiv: 2307.16719 . Bibcode:2023A&A...678A..19C. doi:10.1051/0004-6361/202347111.
  7. 1 2 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  8. 1 2 Staff (January 1, 2010). "List of the Nearest 100 Stellar Systems". Research Consortium on Nearby Stars . Retrieved 2011-07-01.
  9. 1 2 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  10. 1 2 Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B.; Bradley, A. J.; Nelan, E. P.; Whipple, A. L. (2016). "The Solar Neighborhood. XXXVII. The Mass–Luminosity Relation for Main-Sequence M Dwarfs". The Astronomical Journal. 152 (5): 141. arXiv: 1608.04775 . Bibcode:2016AJ....152..141B. doi: 10.3847/0004-6256/152/5/141 . S2CID   54029447.
  11. 1 2 3 Cifuentes, C.; Caballero, J. A.; González-Payo, J.; Amado, P. J.; Béjar, V. J. S.; Burgasser, A. J.; Cortés-Contreras, M.; Lodieu, N.; Montes, D.; Quirrenbach, A.; Reiners, A.; Ribas, I.; Sanz-Forcada, J.; Seifert, W.; Zapatero Osorio, M. R. (January 2025). "CARMENES input catalogue of M dwarfs. IX. Multiplicity from close spectroscopic binaries to ultra-wide systems". Astronomy and Astrophysics. 693: A228. Bibcode:2025A&A...693A.228C. doi:10.1051/0004-6361/202452527. ISSN   0004-6361.
  12. 1 2 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. arXiv: 1905.07921 . Bibcode:2019AJ....158...56H. doi: 10.3847/1538-3881/ab23fe . S2CID   159041104.
  13. ↑ "V* FL Vir". SIMBAD . Centre de données astronomiques de Strasbourg.
  14. ↑ Moffett, T. J. (January 1973). "Wolf 424: a neglected flare star". Monthly Notices of the Royal Astronomical Society. 164: 11–20. Bibcode:1973MNRAS.164...11M. doi: 10.1093/mnras/164.1.11 .

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