Journal Article

PUBDB-2024-07159

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png An Angular Diameter Measurement of β UMa via Stellar Intensity Interferometry with the VERITAS Observatory

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

2024
Institute of Physics Publ. London

This record in other databases:      

Please use a persistent id in citations: doi:10.3847/1538-4357/ad2b68

Report No.: arXiv:2401.01853

Abstract: We use the Very Energetic Radiation Imaging telescope Array System (VERITAS) imaging air Cherenkov telescope 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 (Center for High Angular Resolution Astronomy (CHARA) Array, 1.149 ± 0.014 mas) and mid-infrared (Keck Nuller, 1.08 ± 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 ± 0.04 (stat) ± 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 ± 200 ± 200 K, consistent with ultraviolet spectrophotometry, and an age of 390 ± 29 ± 32 Myr, using MESA Isochrones and Stellar Tracks. This age is consistent with 408 ± 6 Myr from the CHARA Array angular diameter.

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Contributing Institute(s):

1. Cherenkov Telescope Array (Z_CTA)
2. CTA IKC (Z_CTAS)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Very Energetic Radiation Imaging Telescope Array System

Appears in the scientific report 2024

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Acharyya, A. ; Aufdenberg, J. P. ; Bangale, P. ; Bartkoske, J. T. ; Batista, P.DESY* ; Benbow, W. ; Chromey, A. J. ; Davis, J. D. ; Feng, Q. ; Foote, G. M. ; Furniss, A. ; Hanlon, W. ; Hinrichs, C. E. ; Holder, J. ; Jin, W. ; Kaaret, P. ; Kertzman, M. ; Kieda, D. ; Kleiner, T. K.DESY* ; Korzoun, N. ; LeBohec, T. ; Lisa, M. A. ; Lundy, M. ; Matthews, N. ; McGrath, C. E. ; Millard, M. J. ; Moriarty, P. ; Nikkhah, S. ; O'Brien, S. ; Ong, R. A. ; Pohl, M. ; Pueschel, E.DESY* ; Quinn, J. ; Rabinowitz, P. L. ; Ragan, K. ; Roache, E. ; Rose, J. G. ; Sackrider, J. L. ; Sadeh, I.DESY* ; Saha, L. ; Sembroski, G. H. ; Shang, R. ; Tak, D.DESY* ; Ticoras, M. (Corresponding author) ; Tucci, J. V. ; Wong, S. L. ; VERITAS Collaboration (Collaboration author)
An Angular Diameter Measurement of $\beta$ UMa via Stellar Intensity Interferometry with the VERITAS Observatory
[10.3204/PUBDB-2024-00404]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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