Výsledky vyhledávání - "stars [Ultraviolet]"

Red supergiant stars in binary systems. I. Identification and characterisation in the small magellanic cloud from the UVIT ultraviolet imaging survey

Autor: L R Patrick, D Thilker, D J Lennon, L Bianchi, A Schootemeijer, R Dorda, N Langer, I Negueruela

Publikováno v: RUA. Repositorio Institucional de la Universidad de Alicante
Universidad de Alicante (UA)

We aim to identify and characterise binary systems containing red supergiant (RSG) stars in the Small Magellanic Cloud (SMC) using a newly available ultraviolet (UV) point source catalogue obtained using the Ultraviolet Imaging Telescope (UVIT) on bo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53995a9d17b2b388059b4cd0df4fe8b7
https://doi.org/10.1093/mnras/stac1139

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Ultraviolet Line Profiles of Slowly Rotating Massive Star Winds Using the 'Analytic Dynamical Magnetosphere' Formalism

Autor: J. O. Sundqvist, Véronique Petit, C. Erba, Corinne Fletcher, Alexander W. Fullerton, L. Hennicker, Yaël Nazé, A. David-Uraz, Asif ud-Doula

Recent large-scale spectropolarimetric surveys have established that a small but significant percentage of massive stars host stable, surface dipolar magnetic fields with strengths on the order of kG. These fields channel the dense, radiatively drive

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e3ea06fb004694650ce3a2f3978f8dd
http://arxiv.org/abs/2106.13676

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The effect of pulsation on the near-ultraviolet spectrum of AGB stars

Autor: Martín A. Guerrero, R. Ortiz

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Pulsating and non-pulsating asymptotic giant branch (AGB) stars exhibit a variable near-ultraviolet (near-UV) spectrum, which suggest that mechanisms other than pulsation may affect their near-UV spectrum. In this work, we analyse the near-UV spectra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8aeb9572ea0eb21acb5dff95b1776104
https://doi.org/10.1093/mnras/stz2966

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The 2016 January eruption of recurrent Nova LMC 1968

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname

We present a comprehensive review of all observations of the eclipsing recurrent Nova LMC 1968 in the Large Magellanic Cloud which was previously observed in eruption in 1968, 1990, 2002, 2010, and most recently in 2016. We derive a probable recurren

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6e3fceb1ff1ace1d0687a9bc600f5f4a
http://hdl.handle.net/10261/237441

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Ultraviolet and optical spectroscopy of AGB stars showing UV excess

Autor: Martín A. Guerrero, R. Ortiz, Roberto Costa

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Digital.CSIC. Repositorio Institucional del CSIC
instname

We have examined ultraviolet (UV) and optical UB spectra of 20 UV-emitting Asymptotic Giant Branch (AGB) stars of various variability classes to study the intensity of the continuum and emission lines as a function of stellar visual magnitude to shed

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9269c313d972bb27ff10fb4382d7182
http://hdl.handle.net/10261/179354

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Effects of radiation in accretion regions of classical T Tauri stars

Autor: Colombo, S., Ibgui, L., Orlando, S., Rodriguez, R., Espinosa, G., González, M., Stehlé, C., de Sá, L., Argiroffi, C., Bonito, R., Peres, G.

Context. Models and observations indicate that the impact of matter accreting onto the surface of young stars produces regions at the base of accretion columns where optically thin and thick plasma components coexist. Thus, an accurate description of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3658::f11798e296562e7cbcf69918bb7053de
http://hdl.handle.net/10447/389734

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Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b

Autor: Jorge Sanz-Forcada, M. Lopez-Morales, David K. Sing, Hannah R. Wakeford, David Ehrenreich, Nikole K. Lewis, Ofer Cohen, Tiffany Kataria, Gilda E. Ballester, Drake Deming, A. García Muñoz, Thomas M. Evans, Gregory W. Henry, Mark S. Marley, Vincent Bourrier, A. Lecavelier des Etangs, Panayotis Lavvas, Lars A. Buchhave, Romain Allart

Publikováno v: Bourrier, V, Etangs, L D, Ehrenreich, D, Sanz-Forcada, J, Allart, R, Ballester, J, Buchhave, L A, Cohen, L M, Deming, J W, Evans, I G, Muñoz, G, Henry, J P, Kataria, S, Lavvas, P, Lewis, H C, López-Morales, M, Marley, M S, Sing, M & Wakeford, H R 2018, ' Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470b ', Astronomy and Astrophysics, vol. 620, A147 . https://doi.org/10.1051/0004-6361/201833675
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2018, 620, pp.A147. ⟨10.1051/0004-6361/201833675⟩
Astronomy & Astrophysics

GJ 3470b is a warm Neptune transiting an M-dwarf star at the edge of the evaporation desert. It offers the possibility of investigating how low-mass, close-in exoplanets evolve under the irradiation from their host stars. We observed three transits o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a748d267a29075fe2a8256866e31e0be
http://arxiv.org/abs/1812.05119

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A path towards understanding the rotation–activity relation of M dwarfs with K2 mission, X-ray and UV data

Autor: Beate Stelzer, Sean P. Matt, Alexander Scholz, Mario Damasso

Publikováno v: Monthly Notices of the Royal Astronomical Society. 463:1844-1864

We study the relation between stellar rotation and magnetic activity for a sample of 134 bright, nearby M dwarfs observed in the Kepler Two-Wheel (K2) mission during campaigns C0 to C4. The K2 lightcurves yield photometrically derived rotation period

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::89f44afe34aa5f8194d3efb86dca6f64
https://doi.org/10.1093/mnras/stw1936

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White dwarf variability with gPhoton : pulsators

Autor: Tucker, Michael A., Fleming, S.W., Pelisoli, Ingrid Domingos, Romero, Alejandra Daniela, Bell, Keaton, Kepler, Souza Oliveira, Caton, Daniel B., Debes, John, Montgomery, Michael Houston, Thompson, S. E., Koester, Detlev, Million, Chase, Shiao, Bernie

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present results from a search for short time-scale white dwarf variability using gPhoton, a time-tagged data base of GALEX photon events and associated software package. We conducted a survey of 320 white dwarf stars in the McCook–Sion catalogue

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SU Lyn: diagnosing the boundary layer with UV and hard X-ray data

Autor: J. L. Sokoloski, Koji Mukai, T. J. N. Nelson, R. Lopes de Oliveira, G. J. M. Luna

Symbiotic stars in which the symbiotic phenomenon is powered solely by accretion, often at an average rate that is higher than in cataclysmic variable stars, provide an important opportunity to diagnose boundary layers around disk-accreting white dwa

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