Astronomy:FS Tauri

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Short description: Variable star in the constellation Taurus
FS Tauri
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FS Tauri imaged by James Webb's NIRCam instrument
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  04h 22m 01.76s[1]
Declination +26° 57′ 28.9″[1]
Apparent magnitude (V) 14.10[2]
Characteristics
Evolutionary stage Pre main-sequence[3]
Spectral type M3.5e+M0e[4]
Variable type Orion[5]
Astrometry
Radial velocity (Rv)18.940599[6] km/s
Proper motion (μ) RA: 30.7±7[7] mas/yr
Dec.: −39±6.9[7] mas/yr
Parallax (π)7.4695[6] mas
Distance450[1] ly
Details
A
Mass0.64[8] M☉
Radius1.29[9] R☉
Luminosity0.32[9] L☉
Surface gravity (log g)3.87[9] cgs
Temperature3,841[9] K
Metallicity [Fe/H]−0.57[9] dex
Age468,000[8] years
B
Mass0.33[8] M☉
Luminosity0.16[8] L☉
Temperature3,340[8] K
Age2.5[8] Myr
Other designations
HH 157, FS Tau, IRAS 04189+2650(E), 2MASS J04220217+2657304, WISE J042202.17+265730.4[6]
B: FS Tau B, IRAS 04189+2650(W)[10]
Database references
SIMBADA
B

FS Tauri (FS Tau) is a young multiple star system located within the Taurus molecular cloud complex approximately 450 light-years away in the constellation of Taurus.[11][1][12] FS Tauri is known for its young age of 2.8 million years and for its prominent bipolar outflow.[13][14]

Characteristics

FS Tauri is a binary star system consisting of two pre-main-sequence stars.[3] The object was catalogued in 1997 during the study of T Tauri stars in star-forming regions.[15] It appeared as Haro 6-5 and HH157 in Haro and Herbig-Haro Catalog.[16] The system has been studied by Hubble Space Telescope in 1998 and it was discovered that FS Tauri A has a temperature of 3,360 K.[17]

FS Tauri B

In 1996 FS Tauri was imaged with WFPC2, revealing that the source of the jet is FS Tauri B. The source of the jet is not directly visible, but instead is two nebula, which is an edge-on disk, similar to HH 30.[17] Observations with NACO on the VLT showed that inside the disk substantial dust grain growth has taken place and that grains did grow to a size of 1mm or larger.[18] Observations with JWST NIRSpec did show that the brightness of the disk wind and jet is asymmetric and more brighter on the side of the blueshifted jet. The disk is inclined by around 70°.[19]

References

  1. ↑ 1.0 1.1 1.2 1.3 "FS Tau (Webb Image) - NASA Science" (in en-US). 2026-07-02. https://science.nasa.gov/asset/webb/fs-tau-webb-image/. 
  2. ↑ Ducati, J. R. (August 2002). "VizieR Online Data Catalog: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)". VizieR Online Data Catalog. Bibcode: 2002yCat.2237....0D. 
  3. ↑ 3.0 3.1 Tamazian, Vakhtang S.; Docobo, Jose A.; White, Russel J.; Woitas, Jens (2002-10-20). "Preliminary Orbits and System Masses for Five Binary T Tauri Stars" (in en). The Astrophysical Journal 578 (2): 925–934. doi:10.1086/342621. ISSN 0004-637X. Bibcode: 2002ApJ...578..925T. 
  4. ↑ Hartigan, Patrick; Kenyon, Scott J. (2003-01-20). "A Spectroscopic Survey of Subarcsecond Binaries in the Taurus-Auriga Dark Cloud with the Hubble Space Telescope" (in en). The Astrophysical Journal 583 (1): 334–357. doi:10.1086/345293. ISSN 0004-637X. Bibcode: 2003ApJ...583..334H. 
  5. ↑ "VSX : Detail for FS Tau". https://vsx.aavso.org/index.php?view=detail.top&oid=35199. 
  6. ↑ 6.0 6.1 6.2 "FS Tauri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=FS+Tauri. 
  7. ↑ Zacharias, N; Urban, S. E.; Zacharias, M. I.; Wycoff, G. L.; Hall, D. M.; Germain, M. E.; Holdenried, E. R.; Winter, L. (October 2003). "VizieR Online Data Catalog: UCAC2 Catalogue (Zacharias+ 2004)". VizieR Online Data Catalog. Bibcode: 2003yCat.1289....0Z. 
  8. ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Kraus, Adam L.; Hillenbrand, Lynne A. (2009). "Unusually Wide Binaries: Are They Wide or Unusual?". The Astrophysical Journal 703 (2): 1511. doi:10.1088/0004-637X/703/2/1511. Bibcode: 2009ApJ...703.1511K. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 Yu, Jie; Khanna, Shourya; Themessl, Nathalie; Hekker, Saskia; Dréau, Guillaume; Gizon, Laurent; Bi, Shaolan (2023). "Revised Extinctions and Radii for 1.5 Million Stars Observed by APOGEE, GALAH, and RAVE". The Astrophysical Journal Supplement Series 264 (2): 41. doi:10.3847/1538-4365/acabc8. Bibcode: 2023ApJS..264...41Y. 
  10. ↑ "2MASS J04220069+2657324". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=2MASS+J04220069%2B2657324. 
  11. ↑ "NASA's Webb Reveals Stars Sparking to Life in Cosmic Celebration - NASA Science" (in en-US). 2026-07-02. https://science.nasa.gov/missions/webb/nasas-webb-reveals-stars-sparking-to-life-in-cosmic-celebration/. 
  12. ↑ information@eso.org. "FS Tau (Webb NIRCam image) | ESA/Webb" (in en). https://esawebb.org/images/FS-Tau/. 
  13. ↑ information@eso.org. "Hubble sees new star proclaiming its presence with cosmic light show" (in en). https://www.esahubble.org/news/heic2406/. 
  14. ↑ Lazaro, Enrico de (2024-03-29). "Hubble Space Telescope Images Young Multi-Star System | Sci.News" (in en-US). https://www.sci.news/astronomy/hubble-young-multi-star-system-fs-tau-12807.html. 
  15. ↑ Hirth, G. A.; Mundt, R.; Solf, J. (December 1997). "Spatial and kinematic properties of the forbidden emission line region of T Tauri stars". Astronomy and Astrophysics Supplement Series 126 (3): 437–469. doi:10.1051/aas:1997275. ISSN 0365-0138. Bibcode: 1997A&AS..126..437H. 
  16. ↑ "50 Years of Herbig–Haro Research. From discovery to HST". IAU Symposium No. 182. Dordrecht: Kluwer Academic Publishers. 1997. pp. 3–18. Bibcode: 1997IAUS..182....3R. 
  17. ↑ 17.0 17.1 Krist, John E.; Stapelfeldt, Karl R.; Burrows, Christopher J.; Ballester, Gilda E.; Clarke, John T.; Crisp, David; Evans, Robin W.; Gallagher III, John S. et al. (1998-07-10). "Hubble Space Telescope WFPC2 Imaging of FS Tauri and Haro 6-5B" (in en). The Astrophysical Journal 501 (2): 841–852. doi:10.1086/305861. ISSN 0004-637X. Bibcode: 1998ApJ...501..841K. 
  18. ↑ Kirchschlager, Florian; Wolf, Sebastian; Madlener, David (2016-10-11). "The circumstellar disc of FS Tau B – a self-consistent model based on observations in the mid-infrared with NACO". Monthly Notices of the Royal Astronomical Society 462 (1): 858–866. doi:10.1093/mnras/stw1692. ISSN 0035-8711. Bibcode: 2016MNRAS.462..858K. 
  19. ↑ Pascucci, Ilaria; Beck, Tracy L.; Cabrit, Sylvie; Bajaj, Naman S.; Edwards, Suzan; Louvet, Fabien; Najita, Joan R.; Skinner, Bennett N. et al. (4 October 2024). "The nested morphology of disk winds from young stars revealed by JWST/NIRSpec observations" (in en). Nature Astronomy 9 (1): 81–89. doi:10.1038/s41550-024-02385-7. ISSN 2397-3366. Bibcode: 2025NatAs...9...81P. 



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