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An Updated 2017 Astrometric Solution for Betelgeuse
- Source :
- The Astronomical Journal, The Astronomical Journal, 2017, 154 (1), pp.11. ⟨10.3847/1538-3881/aa6ff9⟩, Harper, G M, Brown, A, Guinan, E F, O'Gorman, E, Richards, A M S, Kervella, P & Decin, L 2017, ' An Updated 2017 Astrometric Solution for Betelgeuse ', The Astronomical Journal . https://doi.org/10.3847/1538-3881/aa6ff9, The Astronomical Journal, American Astronomical Society, 2017, 154 (1), pp.11. ⟨10.3847/1538-3881/aa6ff9⟩
- Publication Year :
- 2017
- Publisher :
- HAL CCSD, 2017.
-
Abstract
- We provide an update for the astrometric solution for the Type II supernova progenitor Betelgeuse using the revised Hipparcos Intermediate Astrometric Data (HIAD) of van Leeuwen, combined with existing VLA and new e-MERLIN and ALMA positions. The 2007 Hipparcos refined abscissa measurements required the addition of so-called Cosmic Noise of 2.4 mas to find an acceptable 5-parameter stochastic solution. We find that a measure of radio Cosmic Noise should also be included for the radio positions because surface inhomogeneities exist at a level significant enough to introduce additional intensity centroid uncertainty. Combining the 2007 HIAD with the proper motions based solely on the radio positions leads to a parallax of π =5.27+/- 0.78 mas ({190}-25+33 pc), smaller than the Hipparcos 2007 value of 6.56 ± 0.83 mas ({152}-17+22 pc). Furthermore, combining the VLA and new e-MERLIN and ALMA radio positions with the 2007 HIAD, and including radio Cosmic Noise of 2.4 mas, leads to a nominal parallax solution of 4.51 ± 0.80 mas ({222}-34+48 pc), which, while only 0.7σ different from the 2008 solution of Harper et al., is 2.6σ different from the solution of van Leeuwen. An accurate and precise parallax for Betelgeuse is always going to be difficult to obtain because it is small compared to the stellar angular diameter (θ =44 mas). We outline an observing strategy utilizing future mm and sub-mm high-spatial resolution interferometry that must be used if substantial improvements in the precision and accuracy of the parallax and distance are to be achieved. ispartof: Astrophysical Journal vol:154 issue:1 pages:6- status: published
- Subjects :
- astro-ph.SR
FOS: Physical sciences
Astrophysics
01 natural sciences
symbols.namesake
Angular diameter
0103 physical sciences
010303 astronomy & astrophysics
Cosmic noise
Solar and Stellar Astrophysics (astro-ph.SR)
ComputingMilieux_MISCELLANEOUS
Physics
Betelgeuse
[PHYS]Physics [physics]
010308 nuclear & particles physics
Abscissa
Centroid
Astronomy and Astrophysics
Type II supernova
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
symbols
Parallax
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Intensity (heat transfer)
Subjects
Details
- Language :
- English
- ISSN :
- 00046256, 15383881, 0004637X, and 00046361
- Database :
- OpenAIRE
- Journal :
- The Astronomical Journal, The Astronomical Journal, 2017, 154 (1), pp.11. ⟨10.3847/1538-3881/aa6ff9⟩, Harper, G M, Brown, A, Guinan, E F, O'Gorman, E, Richards, A M S, Kervella, P & Decin, L 2017, ' An Updated 2017 Astrometric Solution for Betelgeuse ', The Astronomical Journal . https://doi.org/10.3847/1538-3881/aa6ff9, The Astronomical Journal, American Astronomical Society, 2017, 154 (1), pp.11. ⟨10.3847/1538-3881/aa6ff9⟩
- Accession number :
- edsair.doi.dedup.....6ac53df97d78bb05f7fa3ac96bab126c
- Full Text :
- https://doi.org/10.3847/1538-3881/aa6ff9⟩