Astronomy:HV 11417

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Short description: Candidate Thorne–Żytkow object in the constellation Tucana
HV 11417
Observation data
Equinox J2000.0]] (ICRS)
Constellation Tucana[1]
Right ascension  01h 00m 48.17s[2]
Declination −72° 51′ 02.1″[2]
Apparent magnitude (V) 19.83[3]
Characteristics
Evolutionary stage M-type supergiant, Thorne-Żytkow object?[4]
Spectral type M5Ie[5]
Astrometry
Proper motion (μ) RA: +0.593[2] mas/yr
Dec.: −1.282[2] mas/yr
Distance~60,000[6] pc
Details
Mass18.4[7] M☉
Radius800[8][lower-alpha 1] R☉
Luminosity81,283[8] L☉
Surface gravity (log g)0.47[2] cgs
Temperature3,450[8] K
Other designations
HV 11417, PMMR 113, TIC 182293383[9]
Database references
SIMBADdata

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 lacked any distinguishing quality which would indicate that classification.[4] It has since been reported that HV 11417 may be a foreground halo star.[10] As of Gaia's 3rd data release the star has been measured to have a negative measured parallax suggesting a distance of more than 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.[2]

Notes

  1. ↑ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:(5,7723,450)4⋅81,283=800 R⊙.

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
  3. ↑ Boyer, Martha L.; Srinivasan, Sundar; Van Loon, Jacco Th.; McDonald, Iain; Meixner, Margaret; Zaritsky, Dennis; Gordon, Karl D.; Kemper, F. et al. (2011). "Surveying the Agents of Galaxy Evolution in the Tidally Stripped, Low Metallicity Small Magellanic Cloud (SAGE-SMC). II. Cool Evolved Stars". The Astronomical Journal 142 (4): 103. doi:10.1088/0004-6256/142/4/103. Bibcode: 2011AJ....142..103B. 
  4. ↑ 4.0 4.1 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. doi:10.1093/mnras/sty1744. Bibcode: 2018MNRAS.479.3101B. 
  5. ↑ Elias, J. H.; Frogel, J. A.; Humphreys, R. M. (1980). "HV 11417 : A peculiar M supergiant in the Small Magellanic Cloud". The Astrophysical Journal 242: L13. doi:10.1086/183391. Bibcode: 1980ApJ...242L..13E. 
  6. ↑ Martínez-Miravé, Pablo; Tamborra, Irene; Vigna-Gómez, Alejandro (2025). "Identifying Thorne–Żytkow Objects through Neutrinos". The Astrophysical Journal 984 (1): L2. doi:10.3847/2041-8213/adc8ab. Bibcode: 2025ApJ...984L...2M. 
  7. ↑ Patrick, L. R.; Thilker, D.; Lennon, D. J.; Bianchi, L.; Schootemeijer, A.; Dorda, R.; Langer, N.; Negueruela, I. (2022). "Red supergiant stars in binary systems. I. Identification and characterization in the small magellanic cloud from the UVIT ultraviolet imaging survey". Monthly Notices of the Royal Astronomical Society 513 (4): 5847. doi:10.1093/mnras/stac1139. Bibcode: 2022MNRAS.513.5847P. 
  8. ↑ 8.0 8.1 8.2 Massey, Philip; Neugent, Kathryn F.; Ekström, Sylvia; Georgy, Cyril; Meynet, Georges (2023). "The Time-averaged Mass-loss Rates of Red Supergiants as Revealed by Their Luminosity Functions in M31 and M33". The Astrophysical Journal 942 (2): 69. doi:10.3847/1538-4357/aca665. Bibcode: 2023ApJ...942...69M. 
  9. ↑ "HV 11417". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HV+11417. 
  10. ↑ 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): 135. September 2020. doi:10.3847/1538-4357/abafad. Bibcode: 2020ApJ...901..135O. 

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