Zobrazeno 1 - 10
of 4 545
pro vyhledávání: '"Hertzsprung-Russell"'
Publikováno v:
Alifmatika, Vol 5, Iss 2, Pp 282-297 (2023)
Differential equations are a fundamental and versatile mathematical tool that finds widespread application across diverse academic disciplines, from physics and biology to economics and engineering. The primary objectives of this report are to demons
Externí odkaz:
https://doaj.org/article/076b306dac504c8a98758a7892de1f02
Autor:
Max J. B. Newman, Kristen B. W. McQuinn, Evan D. Skillman, Martha L. Boyer, Roger E. Cohen, Andrew E. Dolphin, O. Grace Telford
Publikováno v:
The Astrophysical Journal, Vol 975, Iss 2, p 195 (2024)
The tip of the red giant branch (TRGB) is a standardizable candle, identifiable as the discontinuity at the bright extreme of the red giant branch (RGB) stars in color–magnitude diagram space. The TRGB-based distance method has been used to measure
Externí odkaz:
https://doaj.org/article/c2352135512247ef8ef9e20bde62f72c
Autor:
Nolan Habel, Conor Nally, Laura Lenkić, Margaret Meixner, Guido De Marchi, Patrick J. Kavanagh, Katja Fahrion, Omnarayani Nayak, Alec S. Hirschauer, Olivia C. Jones, Katia Biazzo, Bernhard R. Brandl, J. Jaspers, Klaus M. Pontoppidan, Massimo Robberto, C. Rogers, E. Sabbi, B. A. Sargent, David R. Soderblom, Peter Zeidler
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 1, p 108 (2024)
We present a JWST imaging survey with NIRCam and MIRI of NGC 346, the brightest star-forming region in the Small Magellanic Cloud. By combining aperture and point-spread function photometry of 11 wavelength bands across these two instruments, we have
Externí odkaz:
https://doaj.org/article/42d697a86a0d47de9f56c885fb70fd64
Autor:
Kristen. B. W. McQuinn, Yao-Yuan Mao, Erik J. Tollerud, Roger E. Cohen, David Shih, Matthew R. Buckley, Andrew E. Dolphin
Publikováno v:
The Astrophysical Journal, Vol 967, Iss 2, p 161 (2024)
We report the discovery of two ultrafaint dwarf galaxies, Leo M and Leo K, that lie outside the halo of the Milky Way (MW). Using Hubble Space Telescope imaging of the resolved stars, we create color–magnitude diagrams reaching the oldest main-sequ
Externí odkaz:
https://doaj.org/article/a04c740a116f4155900c8eb8fa213cc7
Autor:
Max J. B. Newman, Kristen B. W. McQuinn, Evan D. Skillman, Martha L. Boyer, Roger E. Cohen, Andrew E. Dolphin, O. Grace Telford
Publikováno v:
The Astrophysical Journal, Vol 966, Iss 2, p 175 (2024)
The tip of the red giant branch (TRGB) based distance method in the I band is one of the most efficient and precise techniques for measuring distances to nearby galaxies ( D ≲ 15 Mpc). The TRGB in the near-infrared (NIR) is 1–2 mag brighter relat
Externí odkaz:
https://doaj.org/article/74c79d4ba00b4c1ca73589348e8ce015
Autor:
Daniel R. Weisz, Andrew E. Dolphin, Alessandro Savino, Kristen B. W. McQuinn, Max J. B. Newman, Benjamin F. Williams, Nitya Kallivayalil, Jay Anderson, Martha L. Boyer, Matteo Correnti, Marla C. Geha, Karin M. Sandstrom, Andrew A. Cole, Jack T. Warfield, Evan D. Skillman, Roger E. Cohen, Rachael Beaton, Alessandro Bressan, Alberto Bolatto, Michael Boylan-Kolchin, Alyson M. Brooks, James S. Bullock, Charlie Conroy, Michael C. Cooper, Julianne J. Dalcanton, Aaron L. Dotter, Tobias K. Fritz, Christopher T. Garling, Mario Gennaro, Karoline M. Gilbert, Leo Girardi, Benjamin D. Johnson, L. Clifton Johnson, Jason Kalirai, Evan N. Kirby, Dustin Lang, Paola Marigo, Hannah Richstein, Edward F. Schlafly, Erik J. Tollerud, Andrew Wetzel
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 271, Iss 2, p 47 (2024)
We present NIRCam and NIRISS modules for DOLPHOT, a widely used crowded-field stellar photometry package. We describe details of the modules including pixel masking, astrometric alignment, star finding, photometry, catalog creation, and artificial st
Externí odkaz:
https://doaj.org/article/c2942cef14c8474da98e78e9ba5f8bf7
Autor:
Jae-Woo Lee
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 2, p 227 (2024)
We perform a comparative study of the ex situ second-parameter pair globular clusters (GCs) M30 and M92, having similar metallicities but different horizontal branch morphologies. We obtain similar mean primordial carbon abundances for both clusters.
Externí odkaz:
https://doaj.org/article/f7cfadb0a95744879f8a403175d9e76e
Autor:
Kristen. B. W. McQuinn, Max J. B. Newman, Alessandro Savino, Andrew E. Dolphin, Daniel R. Weisz, Benjamin F. Williams, Martha L. Boyer, Roger E. Cohen, Matteo Correnti, Andrew A. Cole, Marla C. Geha, Mario Gennaro, Nitya Kallivayalil, Karin M. Sandstrom, Evan D. Skillman, Jay Anderson, Alberto Bolatto, Michael Boylan-Kolchin, Christopher T. Garling, Karoline M. Gilbert, Léo Girardi, Jason S. Kalirai, Alessandro Mazzi, Giada Pastorelli, Hannah Richstein, Jack T. Warfield
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 1, p 16 (2024)
We present the first star formation history (SFH) and age–metallicity relation (AMR) derived from resolved stellar populations imaged with the JWST NIRCam instrument. The target is the Local Group star-forming galaxy WLM at 970 kpc. The depth of th
Externí odkaz:
https://doaj.org/article/dfa91b9ef5ab4d4f8277954633ac7c7b
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Akademický článek
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