Astronomy:HP Tauri

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Short description: Variable star system in Taurus
HP Tauri
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HP Tauri and the surrounding GN 04.32.8 nebula imaged by Hubble Space Telescope
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  04h 35m 52.78s[1]
Declination +22° 54′ 23.2″[1]
Apparent magnitude (V) 14.90[2]
Characteristics
Evolutionary stage Pre-main-sequence star
Spectral type K2-5e[3]
Variable type Orion variable
Astrometry
Proper motion (μ) RA: +9.037[1][1] mas/yr
Dec.: −13.853[1][1] mas/yr
Parallax (π)5.8395 ± 0.0490 mas
Distance559 ± 5 ly
(171 ± 1 pc)
Details
Mass1.21[4] M☉
Radius1.60[4] R☉
Luminosity0.99[4] L☉
Surface gravity (log g)3.98[5] cgs
Temperature4,522[5] K
Rotation4.33 days[6]
Rotational velocity (v sin i)17.3[7] km/s
Age1[8] Myr
Other designations
HP Tau, EPIC 247592463, IRAS 04328+2248, 2MASS J04355277+2254231
Database references
SIMBADdata

HP Tauri is a star system in the constellation of Taurus.[9] The component stars of the system are HP Tau, HP Tau G2, and HP Tau G3.[10] HP Tauri is a T Tauri variable star.[10] The star system is located in the Taurus molecular cloud[9] and nebula GN 04.32.8.[11] HP Tauri is around 550 light-years (170 parsecs) away from the Solar System.[12][13] The system is around five-million-years-old.[13]

Observation history

In 1979, HP Tau was found to be surrounded by several stars, HP Tau G1 (which is not gravitationally bound to the rest of the system), HP Tau G2, and HP Tau G3.[13] HP Tau G3 was found to be a binary system in of itself in 1994.[13]

Properties

HP Tau G2 is a G-type star with a surface temperature of 6,030 K (5,760 °C; 10,390 °F).[13][14] HP Tau G2 has elevated iron levels compared to stars later in their evolutions.[15] The star has non-thermal radio pulses.[13]

HP Tau G3 is a M-type, tight binary star.[13][14] HP Tauri may possess a non-thermal spectrum.[16]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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.
  2. ↑ Ducati, J. R. (August 2002). "VizieR Online Data Catalog: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)" (in en). VizieR Online Data Catalog 2237: II/237. Bibcode: 2002yCat.2237....0D. 
  3. ↑ Hartigan, Patrick; Strom, Karen M.; Strom, Stephen E. (June 1994). "Are Wide Pre--Main-Sequence Binaries Coeval?" (in en). The Astrophysical Journal 427: 961. doi:10.1086/174203. ISSN 0004-637X. Bibcode: 1994ApJ...427..961H. 
  4. ↑ 4.0 4.1 4.2 Manzo-Martínez, Ezequiel; Calvet, Nuria; Hernández, Jesús; Lizano, Susana; Hernández, Ramiro Franco; Miller, Christopher J.; Maucó, Karina; Briceño, César et al. (2020). "The Evolution of the Inner Regions of Protoplanetary Disks". The Astrophysical Journal 893 (1): 56. doi:10.3847/1538-4357/ab7ead. Bibcode: 2020ApJ...893...56M. 
  5. ↑ 5.0 5.1 Saad, Serat; Lane, Kaitlyn; Kounkel, Marina; Stassun, Keivan G.; López-Valdivia, Ricardo; Kim, Jinyoung Serena; Peña Ramírez, Karla; Stringfellow, Guy S. et al. (2024). "ABYSS. II. Identification of Young Stars in Optical SDSS Spectra and Their Properties". The Astronomical Journal 167 (3): 125. doi:10.3847/1538-3881/ad2001. Bibcode: 2024AJ....167..125S. 
  6. ↑ Long, Liu; Bi, Shaolan; Zhang, Jinghua; Zhang, Xianfei; Zhang, Liyun; Ge, Zhishuai; Li, Tanda; Chen, Xunzhou et al. (2023). "Investigating 16 Open Clusters in the Kepler/K2-Gaia DR3 Field. I. Membership, Binary Systems, and Rotation". The Astrophysical Journal Supplement Series 268 (1): 30. doi:10.3847/1538-4365/ace5af. Bibcode: 2023ApJS..268...30L. 
  7. ↑ Flores, C.; Connelley, M. S.; Reipurth, B.; Duchêne, G. (2022). "The Effects of Starspots on Spectroscopic Mass Estimates of Low-mass Young Stars". The Astrophysical Journal 925 (1): 21. doi:10.3847/1538-4357/ac37bd. Bibcode: 2022ApJ...925...21F. 
  8. ↑ Ward-Duong, K.; Patience, J.; Bulger, J.; Van Der Plas, G.; Ménard, F.; Pinte, C.; Jackson, A. P.; Bryden, G. et al. (2018). "The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations". The Astronomical Journal 155 (2): 54. doi:10.3847/1538-3881/aaa128. Bibcode: 2018AJ....155...54W. 
  9. ↑ 9.0 9.1 "The young stars of Taurus" (in en). 2025-06-30. https://www.esahubble.org/images/potw2526a/. 
  10. ↑ 10.0 10.1 "Hubble Views the Dawn of a Sun-like Star" (in en-US). https://science.nasa.gov/image-detail/hubble-hptau-wfc3-1-flat-finalok/. 
  11. ↑ "The Young Stars of Taurus" (in en). 2025-12-01. https://www.seti.org/news/planetary-picture-of-the-day-week-of-december-1-2025/. 
  12. ↑ "Triple Stellar Treat" (in en). University of Alaska Anchorage. https://www.noirlab.edu/public/images/iotw2301a/. 
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 Torres, Rosa M.; Loinard, Laurent; Mioduszewski, Amy J.; Rodríguez, Luis F. (2009-05-19). "VLBA DETERMINATION OF THE DISTANCE TO NEARBY STAR-FORMING REGIONS. III. HP TAU/G2 AND THE THREE-DIMENSIONAL STRUCTURE OF TAURUS". The Astrophysical Journal 698 (1): 242–249. doi:10.1088/0004-637X/698/1/242. ISSN 0004-637X. https://iopscience.iop.org/article/10.1088/0004-637X/698/1/242. 
  14. ↑ 14.0 14.1 Rizzuto, Aaron C.; Dupuy, Trent J.; Ireland, Michael J.; Kraus, Adam L. (2020-02-01). "Dynamical Masses of Young Stars. II. Young Taurus Binaries Hubble 4, FF Tau, and HP Tau/G3". The Astrophysical Journal 889 (2): 175. doi:10.3847/1538-4357/ab5aed. ISSN 0004-637X. Bibcode: 2020ApJ...889..175R. 
  15. ↑ Telleschi, A.; Güdel, M.; Briggs, K. R.; Audard, M.; Scelsi, L. (2007-06-01). "High-resolution X-ray spectroscopy of T Tauri stars in the Taurus-Auriga complex" (in en). Astronomy & Astrophysics 468 (2): 443–462. doi:10.1051/0004-6361:20066193. ISSN 0004-6361. Bibcode: 2007A&A...468..443T. 
  16. ↑ Pudritz, R.E. (1986-05-06). "Star formation in molecular disks". Publications of the Astronomical Society of the Pacific 98 (606): 709. doi:10.1086/131818. Bibcode: 1986PASP...98..709P. 



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