UX Orionis is a variable star in the constellation of Orion. It is a Herbig Ae star, located about 1000 light years from the Earth.[8] At its brightest it is a magnitude 9.5 object, so it is too faint to be seen with the naked eye.[3] UX Orionis is the prototype of the UX Orionis class of variable stars (often called "UXors"), which are young stellar objects that exhibit large (greater than 2.8 magnitude), irregular changes in visual band brightness.[9][3] UX Orionis was discovered by Henrietta Swan Leavitt.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 04m 29.9879s[2] |
| Declination | −03° 47′ 14.2867″[2] |
| Apparent magnitude (V) | 9.48 – 12.5[3] |
| Characteristics | |
| Spectral type | A3ea[3] |
| Astrometry | |
| Proper motion (μ) | RA: 1.056±0.028 mas/yr[2] Dec.: -3.998±0.019 mas/yr[2] |
| Parallax (π) | 3.1004 ± 0.0285 mas[2] |
| Distance | 1,052 ± 10 ly (323 ± 3 pc) |
| Details | |
| Mass | 1.2[4] M☉ |
| Radius | 2.1[4] R☉ |
| Luminosity | 5.6[4] L☉ |
| Surface gravity (log g) | 3.86[4] cgs |
| Temperature | 6,136[4] K |
| Rotational velocity (v sin i) | 143[5] km/s |
| Age | 4.8[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
UX Orionis is surrounded by a circumstellar disk, and the star's photometric variability appears to be caused by episodes during which the star is obscured by dusty material within the circumstellar disk.[8]
References
edit- ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 10 November 2022.
- ^ a b c d 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.
- ^ a b c d e "UX Ori". The International Variable Star Index. AAVSO. Retrieved 10 November 2022.
- ^ a b c d e Stassun, Keivan G.; et al. (2019-10-01). "The Revised TESS Input Catalog and Candidate _target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. hdl:1721.1/124721. ISSN 0004-6256. S2CID 166227927.
- ^ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.
- ^ Manoj, P. (2006). "Evolution of Emission-Line Activity in Intermediate-Mass Young Stars". The Astrophysical Journal. 653 (1): 657–674. arXiv:astro-ph/0608541. Bibcode:2006ApJ...653..657M. doi:10.1086/508764. S2CID 17545474.
- ^ "UX Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 November 2022.
- ^ a b Kreplin, A.; Madlener, D.; Chen, L.; Weigelt, G.; Kraus, S.; Grinin, V.; Tambovtseva, L.; Kishimoto, M. (May 2016). "Resolving the inner disk of UX Orionis" (PDF). Astronomy and Astrophysics. 590: A96. Bibcode:2016A&A...590A..96K. doi:10.1051/0004-6361/201628281.
- ^ Herbst, W.; Herbst, D. K.; Grossman, E. J.; Weinstein, D. (November 1994). "Catalogue of UBVRI Photometry of T Tauri Stars and Analysis of the Causes of Their Variability". Astronomical Journal. 108: 1906. Bibcode:1994AJ....108.1906H. doi:10.1086/117204.