An Angular Diameter Measurement of $β$ UMa via Stellar Intensity Interferometry with the VERITAS Observatory Article Swipe

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A. Acharyya , J. P. Aufdenberg , P. Bangale , J. T. Bartkoske , P. Batista , W. Benbow , A. J. Chromey , John D. Davis , Q. Feng , G. M. Foote , A. Furniss , W. Hanlon , C. E. Hinrichs , J. Holder , W. Jin , P. Kaaret , M. Kertzman , D. Kieda , T. K. Kleiner , N. Korzoun , Tugdual LeBohec , M. A. Lisa , M. Lundy , Nolan Matthews , C.E. McGrath , M. J. Millard , P. Moriarty , S. Nikkhah , S. O’Brien , R. A. Ong , M. Pohl , E. Pueschel , J. Quinn , P. Rabinowitz , K. Ragan , E. Roache , J. Rose , J. L. Sackrider , I. Sadeh , L. Saha , G. H. Sembroski , R. Shang , D. Tak , M. Ticoras , J. V. Tucci , S. L. Wong , The VERITAS Collaboration ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.48550/arxiv.2401.01853

We use the VERITAS imaging air Cherenkov Telescope (IACT) array to obtain the first measured angular diameter of $β$ UMa at visual wavelengths using stellar intensity interferometry (SII) and independently constrain the limb-darkened angular diameter. The age of the Ursa Major moving group has been assessed from the ages of its members, including nuclear member Merak ($β$ UMa), an A1-type subgiant, by comparing effective temperature and luminosity constraints to model stellar evolution tracks. Previous interferometric limb-darkened angular-diameter measurements of $β$ UMa in the near-infrared (CHARA Array, $1.149 \pm 0.014$ mas) and mid-infrared (Keck Nuller, $1.08 \pm 0.07$ mas), together with the measured parallax and bolometric flux, have constrained the effective temperature. This paper presents current VERITAS-SII observation and analysis procedures to derive squared visibilities from correlation functions. We fit the resulting squared visibilities to find a limb-darkened angular diameter of $1.07 \pm 0.04 {\rm (stat)} \pm 0.05$ (sys) mas, using synthetic visibilities from a stellar atmosphere model that provides a good match to the spectrum of $β$ UMa in the optical wave band. The VERITAS-SII limb-darkened angular diameter yields an effective temperature of $9700\pm200\pm 200$ K, consistent with ultraviolet spectrophotometry, and an age of $390\pm 29 \pm 32 $ Myr, using MESA Isochrones and Stellar Tracks (MIST). This age is consistent with $408 \pm 6$ Myr from the CHARA Array angular diameter.

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Physics Angular diameter Astrophysics Limb darkening Interferometry Angular resolution (graph drawing) Telescope Astronomy Infrared Optics Stars Combinatorics Mathematics

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2401.01853
PDF: https://arxiv.org/pdf/2401.01853
OA Status: green
Related Works: 10
OpenAlex ID: https://openalex.org/W4390602455

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DOI: https://doi.org/10.48550/arxiv.2401.01853

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Title: An Angular Diameter Measurement of $β$ UMa via Stellar Intensity Interferometry with the VERITAS Observatory

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Language: en

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Publication year: 2024

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Publication date: 2024-01-03

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Authors: A. Acharyya, J. P. Aufdenberg, P. Bangale, J. T. Bartkoske, P. Batista, W. Benbow, A. J. Chromey, John D. Davis, Q. Feng, G. M. Foote, A. Furniss, W. Hanlon, C. E. Hinrichs, J. Holder, W. Jin, P. Kaaret, M. Kertzman, D. Kieda, T. K. Kleiner, N. Korzoun, Tugdual LeBohec, M. A. Lisa, M. Lundy, Nolan Matthews, C.E. McGrath, M. J. Millard, P. Moriarty, S. Nikkhah, S. O’Brien, R. A. Ong, M. Pohl, E. Pueschel, J. Quinn, P. Rabinowitz, K. Ragan, E. Roache, J. Rose, J. L. Sackrider, I. Sadeh, L. Saha, G. H. Sembroski, R. Shang, D. Tak, M. Ticoras, J. V. Tucci, S. L. Wong, The VERITAS Collaboration

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Landing page: https://arxiv.org/abs/2401.01853

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Concepts: Physics, Angular diameter, Astrophysics, Limb darkening, Interferometry, Angular resolution (graph drawing), Telescope, Astronomy, Infrared, Optics, Stars, Combinatorics, Mathematics

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