Chandra HETG X-Ray Spectra and Variability of π Aqr, a γ Cas-type Be Star

Autor: David P. Huenemoerder, Pragati Pradhan, Claude R. Canizares, Sean Gunderson, Richard Ignace, Joy S. Nichols, A. M. T. Pollock, Norbert S. Schulz, Dustin K. Swarm, José M. Torrejón

Publikováno v: The Astrophysical Journal Letters, Vol 966, Iss 2, p L23 (2024)

High-resolution X-ray spectra of π Aqr, a γ Cas-type star, obtained with the Chandra/HETG spectrometer, revealed emission lines of H-like ions of Mg, Si, S, and Fe; a strong, hard continuum; and a lack of He-like ions, indicating the presence of ve

Externí odkaz: https://doaj.org/article/f228a35885aa4fb19cfa5a1649ab9b5f

New Method to Detect and Characterize Active Be Star Candidates in Open Clusters

Autor: Anahí Granada, Maziar R. Ghoreyshi, Carol E. Jones, Tõnis Eenmäe

Publikováno v: Galaxies, Vol 11, Iss 1, p 37 (2023)

With the aim of better understanding the physical conditions under which Be stars form and evolve, it is imperative to further investigate whether poorly studied young open clusters host Be stars. In this work, we explain how data from Gaia DR2 and D

Externí odkaz: https://doaj.org/article/bddff45ec0f640cd8a97b93ab549b937

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Near-infrared characterization of four massive stars in transition phases

Autor: Andrea Fabiana Torres, M. L. Arias, Michaela Kraus, A. A. Djupvik, Tõnis Eenmäe, Lydia Sonia Cidale, T. Liimets, Y. R. Cochetti

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET
SEDICI (UNLP)
Universidad Nacional de La Plata
instacron:UNLP
The Astronomical Journal

Massive stars typically undergo short-lived post-main sequence evolutionary phases with strong mass loss and occasional mass eruptions. Many of such massive stars in transition phases have been identified based on their dusty envelopes. The ejected m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45a26c9dc0b98b27211769fadb721253