HV 11417 is a candidate Thorne–Żytkow object in the Small Magellanic Cloud, put forward in a paper by Emma Beasor and collaborators. The paper also claims that another candidate for the Thorne–Żytkow object, HV 2112, was not a Thorne–Żytkow object because it seemingly possessed no strange quality that would label it as a Thorne–Żytkow object.[1] HV 11417 has since been identified as a likely foreground halo star.[3] As of Gaia's 3rd data release the star has been measured to have a negative measured parallax suggesting at distance of >103,000 light-years (32,000 pc) at the 3-sigma level, and a proper motion consistent with Small Magellanic Cloud stars in its region of the galaxy.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Tucana |
| Right ascension | 01h 00m 48.2s[1] |
| Declination | −72° 51′ 02.1″[1] |
| Apparent magnitude (V) | 19.83[2] |
| Characteristics | |
| Evolutionary stage | M-type supergiant, Thorne-Żytkow object? |
| Spectral type | M5Ie[2] |
| Astrometry | |
| Proper motion (μ) | RA: −0.307[2] mas/yr Dec.: −1.769[2] mas/yr |
| Details | |
| Radius | 673–798[citation needed] R☉ |
| Luminosity | 74100[1] L☉ |
| Other designations | |
HV 11417, PMMR 113, TIC 182293383[2] | |
| Database references | |
| SIMBAD | data |
References
edit- ^ a b c d Beasor, Emma R.; Davies, Ben; Cabrera-Ziri, Ivan; Hurst, Georgia (2018-07-02). "A critical re-evaluation of the Thorne–Żytkow object candidate HV 2112". Monthly Notices of the Royal Astronomical Society. 479 (3): 3101–3105. arXiv:1806.07399. Bibcode:2018MNRAS.479.3101B. doi:10.1093/mnras/sty1744. S2CID 67766043.
- ^ a b c d e "HV 11417". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-02-15.
- ^ O'Grady, Anna (2020). "Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds from ASAS-SN: Implications for Thorne-Żytkow Objects and Super-asymptotic Giant Branch Stars". Astrophysical Journal. 901 (2) (published September 2020): 135. arXiv:2008.06563. Bibcode:2020ApJ...901..135O. doi:10.3847/1538-4357/abafad.
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