Results 81 to 90 of about 3,177 (205)

Imaging the Small-Scale Circumstellar Gas Around T Tauri Stars [PDF]

, 1995
We have detected circumstellar molecular gas around a small sample of T Tauri stars through aperture synthesis imaging of CO(2→1) emission at ˜2"-3" resolution. RY Tauri, DL Tauri, DO Tauri, and AS 209 show resolved and elongated gaseous emission. For RY
Sargent, A. I., Koerner, D. W.
core  

Dust-evacuated Zones near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions

The Astrophysical Journal
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a constant ...
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić   +2 more
doaj   +1 more source

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

Spectroscopic Evolution of Disintegrating Planetesimals: Minute to Month Variability in the Circumstellar Gas Associated with WD 1145+017 [PDF]

, 2017
With the recent discovery of transiting planetary material around WD 1145+017, a critical target has been identified that links the evolution of planetary systems with debris disks and their accretion onto the star.
Farihi, J., Redfield, S, M. Duvvuri, Girish, Farihi, J, Gaensicke, BT, Boris T. Gänsicke, Girish M. Duvvuri, Cauley, P.W., Cauley, PW, Jay Farihi, M. Duvvuri, G., Redfield, Seth, Parsons, Steven G., Gänsicke, B. T. (Boris T.), Parsons, SG, Cauley, P. Wilson, Gänsicke, B.T., Duvvuri, GM, Parsons, S.G., Steven G. Parsons, Farihi, Jay, Seth Redfield, Redfield, S., P. Wilson Cauley   +23 more
core   +1 more source

Hourglass Magnetic Field of a Protostellar System

Universe
An hourglass-shaped magnetic field pattern arises naturally from the gravitational collapse of a star-forming gas cloud. Most studies have focused on the prestellar collapse phase, when the structure has a smooth and monotonic radial profile.
Shantanu Basu, Xiyuan Li, Gianfranco Bino   +2 more
doaj   +1 more source

Limitations of the modified blackbody fit method for determining molecular cloud properties

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract Achieving a comprehensive understanding of the star and planet formation process is one of the fundamental tasks of astrophysics, requiring detailed knowledge of the physical conditions during the different phases of this process. During the earliest stages, that is, concerning physical processes in molecular clouds and filaments, the column ...
Niko Zielinski, Sebastian Wolf
wiley   +1 more source

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

Model for the circumstellar gas around alpha Orionis

The Astrophysical Journal, 1981
Models are presented to explain the physical conditions in the circumstellar envelope surrounding the red supergiant Alpha Orionis. The models of the CO density and neutral atomic potassium density are calculated for the outer shell to reproduce simultaneously both the radio detection of CO and optical measurements of the amount of scattering by ...
M. Jura, M. Morris
openaire   +1 more source

Diagnostics of circumstellar gas in Algol-type binaries [PDF]

, 1992
В статье дается обзор наблюдаемых особенностей и анализ физических условий в околозвездном газе в полуразделенных двойных системах типа Алголя. Показано, что основные кинематические и морфологические свойства околозвездных и околосистемных газовых сред ...
Пустыльник, И.Б.
core  

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