Výsledky vyhledávání - "Peter B Stetson"

Homogeneous photometry – VII. Globular clusters in the Gaia era

Autor: Matteo Monelli, Alice Zocchi, Nicoletta Sanna, Peter B. Stetson, Elena Pancino

Publikováno v: Monthly Notices of the Royal Astronomical Society. 485:3042-3063

We present wide-field, ground-based Johnson-Cousins UBVRI photometry for 48 Galactic globular clusters based on almost 90000 public and proprietary images. The photometry is calibrated with the latest transformations obtained in the framework of our

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33edc22f54754f8a8fa2db17c553be1d
https://doi.org/10.1093/mnras/stz585

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On the Use of Field RR Lyrae as Galactic Probes. III. The α-element Abundances*

Publikováno v: The Astrophysical Journal
The Astrophysical Journal, American Astronomical Society, 2021, 914 (1), pp.10. ⟨10.3847/1538-4357/abfa23⟩

We provide the largest and most homogeneous sample of $\alpha$-element (Mg, Ca, Ti) and iron abundances for field RR Lyrae (RRLs, 162 variables) by using high-resolution spectra. The current measurements were complemented with similar abundances avai

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1025e051de8aced2bc1bfa43c49d707
https://hal.archives-ouvertes.fr/hal-03375259

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Variable stars in Local Group Galaxies -- V. The fast and early evolution of the low-mass Eridanus II dSph galaxy

Publikováno v: Monthly Notices of the Royal Astronomical Society, 508(1), 1064-1083. Oxford University Press

We present a detailed study of the variable star population of Eridanus II (Eri II), an ultra-faint dwarf galaxy that lies close to the Milky Way virial radius. We analyze multi-epoch $g,r,i$ ground-based data from Goodman and the Dark Energy Camera,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9c8faed73dcd43c9bbee1af04d333f2

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Towards Realistic Modeling of the Astrometric Capabilities of MCAO Systems: Detecting an Intermediate Mass Black Hole with MAVIS

Autor: Jesse Cranney, Stephanie Monty, Holger Baumgardt, Dionne M. Haynes, Giuliana Fiorentino, Richard M. McDermid, Francois Rigaut, Cedric Plantet, Davide Greggio, Guido Agapito, J. Trevor Mendel, Peter B. Stetson

Accurate astrometry is a key deliverable for the next generation of multi-conjugate adaptive optics (MCAO) systems. The MCAO Visible Imager and Spectrograph (MAVIS) is being designed for the Very Large Telescope Adaptive Optics Facility and must achi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2130e5a6d77017745ed82fc6b97c5b62

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On the Metamorphosis of the Bailey Diagram for RR Lyrae Stars

Publikováno v: The Astrophysical journal letters
The Astrophysical journal letters, Bristol : IOP Publishing, 2020, 896 (1), pp.L15. ⟨10.3847/2041-8213/ab9538⟩

We collected over 6000 high-resolution spectra of four dozen field RR Lyrae (RRL) variables pulsating either in the fundamental (39 RRab) or in the first overtone (9 RRc) mode. We measured radial velocities (RVs) of four strong metallic and four Balm

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06d9903c1edb93790f055c988b080cf8
https://hal.archives-ouvertes.fr/hal-02989237

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A plague of magnetic spots among the hot stars of globular clusters

Autor: Giampaolo Piotto, Yazan Momany, Ivo Saviane, Santi Cassisi, David Jones, Lorenzo Monaco, Simone Zaggia, Marco Gullieuszik, Peter B. Stetson, Valentina D'Orazi, M. Montalto, C. Moni Bidin, Yuri Beletsky, L. Girardi, H. M. J. Boffin, Elena Mason, H. Lala, Antonino Milone

Six decades and counting, the formation of hot ~20,000-30,000 K Extreme Horizontal Branch (EHB) stars in Galactic Globular Clusters remains one of the most elusive quests in stellar evolutionary theory. Here we report on two discoveries shattering th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c65d9ba62ccff5b86f487e83b6d0b096
http://hdl.handle.net/11577/3350231

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UVIT–HST–GAIAview of NGC 288: a census of the hot stellar population and its properties from UV

Autor: Annapurni Subramaniam, N. Kameswara Rao, Patrick Côté, Peter B. Stetson, Snehalata Sahu

Publikováno v: Monthly Notices of the Royal Astronomical Society. 482:1080-1095

A complete census of the blue horizontal branch (BHB) and blue straggler star (BSS) population within a 10′ radius from the centre of the globular cluster NGC 288 is presented, based on images from the Ultraviolet Imaging Telescope (UVIT). The UV a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3f7cfef6e4aeb6e9043ca786fe580f6d
https://doi.org/10.1093/mnras/sty2679

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Akademický článek

The impact of whaling on the ocean carbon cycle: why bigger was better.

Autor: Andrew J Pershing, Line B Christensen, Nicholas R Record, Graham D Sherwood, Peter B Stetson

Publikováno v: PLoS ONE, Vol 5, Iss 8, p e12444 (2010)

BackgroundHumans have reduced the abundance of many large marine vertebrates, including whales, large fish, and sharks, to only a small percentage of their pre-exploitation levels. Industrial fishing and whaling also tended to preferentially harvest

Externí odkaz: https://doaj.org/article/55b52e4300a94e4fbfbb927837b73bf6

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