Results 61 to 70 of about 2,036 (233)

“X-Raying” a Be Star Disk: Fundamental Parameters of the Eclipsing Binary Be Star V658 Car

The Astrophysical Journal
With its two stellar eclipses and two disk attenuations per binary orbit, V658 Carinae stands out as the first clear eclipsing Be + sdOB system. This rare alignment offers a unique opportunity to probe the structure and dynamics of a Be star disk with ...
Tajan H. de Amorim, Alex C. Carciofi, Jonathan Labadie-Bartz, Ariane C. Silva, Felipe Navarete, Saul A. Rappaport, Pamela Querido, Amanda C. Rubio, Jon Bjorkman, Robert Gagliano, Ivan Terentev   +10 more
doaj   +1 more source

DISK DETECTIVE: DISCOVERY OF NEW CIRCUMSTELLAR DISK CANDIDATES THROUGH CITIZEN SCIENCE [PDF]

The Astrophysical Journal, 2016
ABSTRACT The Disk Detective citizen science project aims to find new stars with 22 μm excess emission from circumstellar dust using data from NASA’s Wide-field Infrared Survey Explorer (WISE) mission. Initial cuts on the AllWISE catalog provide an input catalog of 277,686 sources.
Kuchner, Marc J., Silverberg, Steven M., Bans, Alissa S., Bhattacharjee, Shambo, Kenyon, Scott J., Debes, John H., Currie, Thayne, García, Luciano, Jung, Dawoon, Lintott, Chris, McElwain, Michael, Padgett, Deborah L., Rebull, Luisa M., Wisniewski, John P., Nesvold, Erika, Schawinski, Kevin, Thaller, Michelle L., Grady, Carol A., Biggs, Joseph, Bosch, Milton, C̆ernohous, Tadeás̆, Durantini Luca, Hugo A., Hyogo, Michiharu, Wah, Lily Lau Wan, Piipuu, Art, Piñeiro, Fernanda, Disk Detective Collaboration   +26 more
openaire   +3 more sources

Characterizing the dynamical magnetosphere of the extremely slowly rotating magnetic O9.7 V star HD 54879 using rotational modulation of the Hα profile

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract The magnetic field in the O9.7 V star HD 54879 has been monitored for almost a decade. Spectropolarimetric observations reveal a rather strong mean longitudinal magnetic field that varies with a period of about 7.41 years. Observations in the Hα$$ \alpha $$ line show a variation with the same period, while the Hβ$$ \beta $$ line shows only ...
Manfred Küker, S. P. Järvinen, S. Hubrig, Ilya Ilyin, M. Schöller   +4 more
wiley   +1 more source

The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. VI. Evidence for Radially Evolving Icy Grains in the HD 141569A Disk via NIRCam Coronagraphic Imaging

The Astrophysical Journal
We present JWST NIRCam coronagraphic observations of the HD 141569A circumstellar disk, obtained as part of the JWST Early Release Science program. The observations recover the multi-ringed structure seen in previous shorter-wavelength observations, but ...
Maxwell A. Millar-Blanchaer, Élodie Choquet, Kellen Lawson, Sebastián Marino, Jens Kammerer, Aarynn L. Carter, Isabel Rebollido, Jarron M. Leisenring, Minjae Kim, Paul Kalas, Karl R Stapelfeldt, Sasha Hinkley, Mark Booth, Carol A. Grady, Elisabeth C. Matthews, Beth A. Biller, Andrew Skemer, Julien H. Girard, Schuyler G. Wolff, Kimberly Ward-Duong, Michael R. Meyer, Anthony Boccaletti, Eric Pantin, Brenda C. Matthews, Stanimir Metchev, Marshall D. Perrin, Christine H. Chen, Katie Crotts, Olivier Absil, William O. Balmer, Per Calissendorff, Gabriele Cugno, Thayne Currie, Camilla Danielski, Kielan K. W. Hoch, Markus Janson, Elena Manjavacas, Pierre-Olivier Lagage, Ben J. Sutlieff, Shrishmoy Ray, Bin B. Ren, Emily Rickman, Genaro Suárez, Christopher A. Theissen, Taichi Uyama, Andreas Quirrenbach, Jason J. Wang, Niall Whiteford, Mark C. Wyatt, Alice Zurlo, (The JWST ERS Collaboration)   +50 more
doaj   +1 more source

FAR-ULTRAVIOLET H ₂ EMISSION FROM CIRCUMSTELLAR DISKS [PDF]

The Astrophysical Journal, 2009
15 pages, 4 figures, accepted to ...
Ingleby, Laura, Calvet, Nuria, Bergin, Edwin, Yerasi, Ashwin, Espaillat, Catherine, Herczeg, Gregory, Roueff, Evelyne, Abgrall, Hervé, Hernández, Jesus, Briceño, César, Pascucci, Ilaria, Miller, Jon, Fogel, Jeffrey, Hartmann, Lee, Meyer, Michael, Carpenter, John, Crockett, Nathan, McClure, Melissa   +17 more
openaire   +4 more sources

Discovery of a Rare Eclipsing Be/X-Ray Binary System, Swift J010902.6-723710 = SXP 182

The Astrophysical Journal Letters
We report on the discovery of Swift J010902.6-723710, a rare eclipsing Be/X-ray Binary system by the Swift SMC Survey (S-CUBED). Swift J010902.6-723710 was discovered via weekly S-CUBED monitoring observations when it was observed to enter a state of X ...
Thomas M. Gaudin, Jamie A. Kennea, M. J. Coe, I. M. Monageng, Andrzej Udalski, L. J. Townsend, David A. H. Buckley, Phil A. Evans   +7 more
doaj   +1 more source

NGC7538 IRS1 N: Modeling a Circumstellar Maser Disk [PDF]

Astrophysics and Space Science, 2005
To appear in The Proceedings of the 2004 European Workshop: "Dense Molecular Gas around Protostars and in Galatic Nuclei", Eds. Y. Hagiwara, W.A. Baan, H.J.
Pestalozzi, M. R., Elitzur, M., Conway, J., Booth, R.   +3 more
openaire   +2 more sources

L1448 IRS3B: Dust Polarization Aligned with Spiral Features, Tracing Gas Flows

The Astrophysical Journal
Circumstellar disk dust polarization in the (sub)millimeter is, for the most part, not from dust grain alignment with magnetic fields but rather indicative of a combination of dust self-scattering with a yet unknown alignment mechanism that is consistent
Leslie W. Looney, Zhe-Yu Daniel Lin, Zhi-Yun Li, John J. Tobin, Martin Radecki, Syzygy Butte, Ian W. Stephens, Manuel Fernández-López, Haifeng Yang, Nickalas K. Reynolds, Patrick Sheehan, Woojin Kwon, Rachel Harrison, Allen North   +13 more
doaj   +1 more source

Observations of Circumstellar Disks

, 2001
Review article to appear in "The 4th Tetons Summer School Conference: "Galactic Structure, Stars, and the Interstellar Medium," ed. C.W. Woodward, M. . Bicay, & J.M. Schull (San Francisco: ASP), 23 page LaTeX file with 7 low-resolution figures. For postscript version with embedded high-resolution figures, retrieve from http://www.hep.upenn.edu/PORG/
openaire   +2 more sources

Particle emissivity in circumstellar disks

The Astrophysical Journal, 1991
Submillimeter continuum observations of 29 pre-main-sequence objects in Taurus and Orion are used to study the wavelength dependence of particle emission. These objects are mostly T Tauri stars whose long-wavelength emission is thought to originate in circumstellar disks.
Steven V. W. Beckwith, Anneila I. Sargent   +1 more
openaire   +1 more source