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HP Tauri

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HP Tauri

HP Tauri and the surrounding GN 04.32.8 nebula imaged by Hubble Space Telescope
Observation data
Epoch J2000.0      Equinox J2000.0
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 + G2e + M0.6[3]
Variable type Orion variable
Astrometry
Proper motion (μ) RA: +9.037[1] mas/yr[1]
Dec.: −13.853[1] mas/yr[1]
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, Gaia DR3 145213187879627776
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 (the latter two also entitled HP Tau/G2, and HP Tau/G3, respectively).[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

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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

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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

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  1. ^ a b c d e 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.
  2. ^ Ducati, J. R. (August 2002). "VizieR Online Data Catalog: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)". 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?". The Astrophysical Journal. 427: 961. Bibcode:1994ApJ...427..961H. doi:10.1086/174203. ISSN 0004-637X.
  4. ^ a b c Manzo-Martínez, Ezequiel; Calvet, Nuria; Hernández, Jesús; Lizano, Susana; Hernández, Ramiro Franco; Miller, Christopher J.; Maucó, Karina; Briceño, César; d'Alessio, Paola (2020). "The Evolution of the Inner Regions of Protoplanetary Disks". The Astrophysical Journal. 893 (1): 56. arXiv:2004.02916. Bibcode:2020ApJ...893...56M. doi:10.3847/1538-4357/ab7ead.
  5. ^ a b Saad, Serat; Lane, Kaitlyn; Kounkel, Marina; Stassun, Keivan G.; López-Valdivia, Ricardo; Kim, Jinyoung Serena; Peña Ramírez, Karla; Stringfellow, Guy S.; Román-Zúñiga, Carlos G.; Hernández, Jesús; Wolk, Scott J.; Hillenbrand, Lynne A. (2024). "ABYSS. II. Identification of Young Stars in Optical SDSS Spectra and Their Properties". The Astronomical Journal. 167 (3): 125. arXiv:2401.01932. Bibcode:2024AJ....167..125S. doi:10.3847/1538-3881/ad2001.
  6. ^ Long, Liu; Bi, Shaolan; Zhang, Jinghua; Zhang, Xianfei; Zhang, Liyun; Ge, Zhishuai; Li, Tanda; Chen, Xunzhou; Li, Yaguang; Ye, Lifei; Sun, Tiancheng; Zhou, Jianzhao (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. arXiv:2307.06596. Bibcode:2023ApJS..268...30L. doi:10.3847/1538-4365/ace5af.
  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. arXiv:2111.03957. Bibcode:2022ApJ...925...21F. doi:10.3847/1538-4357/ac37bd.
  8. ^ Ward-Duong, K.; Patience, J.; Bulger, J.; Van Der Plas, G.; Ménard, F.; Pinte, C.; Jackson, A. P.; Bryden, G.; Turner, N. J.; Harvey, P.; Hales, A.; De Rosa, R. J. (2018). "The Taurus Boundary of Stellar/Substellar (TBOSS) Survey. II. Disk Masses from ALMA Continuum Observations". The Astronomical Journal. 155 (2): 54. arXiv:1712.07669. Bibcode:2018AJ....155...54W. doi:10.3847/1538-3881/aaa128.
  9. ^ a b "The young stars of Taurus". ESA Hubble. 2025-06-30. Retrieved 2026-01-19.
  10. ^ a b "Hubble Views the Dawn of a Sun-like Star". NASA Science. Retrieved 2026-01-21.
  11. ^ "The Young Stars of Taurus". SETI Institute. 2025-12-01. Retrieved 2026-01-22.
  12. ^ "Triple Stellar Treat". NOIRLab. University of Alaska Anchorage. Retrieved 2026-01-25.
  13. ^ a b c d e f g 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. arXiv:0903.5338. doi:10.1088/0004-637X/698/1/242. ISSN 0004-637X – via IOP Science.
  14. ^ a b 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. arXiv:1911.12378. Bibcode:2020ApJ...889..175R. doi:10.3847/1538-4357/ab5aed. ISSN 0004-637X.
  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". Astronomy & Astrophysics. 468 (2): 443–462. arXiv:astro-ph/0611024. Bibcode:2007A&A...468..443T. doi:10.1051/0004-6361:20066193. ISSN 0004-6361 – via EDP Sciences.
  16. ^ Pudritz, R.E. (1986-05-06). "Star formation in molecular disks". Publications of the Astronomical Society of the Pacific. 98 (606): 709. Bibcode:1986PASP...98..709P. doi:10.1086/131818 – via IOP Science.
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