G
Gösta F. Gahm
Researcher at Stockholm University
Publications - 42
Citations - 1126
Gösta F. Gahm is an academic researcher from Stockholm University. The author has contributed to research in topics: T Tauri star & Accretion (astrophysics). The author has an hindex of 17, co-authored 41 publications receiving 1055 citations.
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Journal ArticleDOI
The origins of fluorescent h2 emission from t tauri stars
Gregory J. Herczeg,Gregory J. Herczeg,Jeffrey L. Linsky,Frederick M. Walter,Gösta F. Gahm,Christopher M. Johns-Krull +5 more
TL;DR: In this paper, a survey of fluorescent H2 emission in HST STIS spectra of the classical T T Tauri stars (CTTSs) TW Hya, DF Tau, RU Lupi, T Tau, and DG Tau is presented.
Journal ArticleDOI
The Loopy Ultraviolet Line Profiles of RU Lupi: Accretion, Outflows, and Fluorescence
Gregory J. Herczeg,Frederick M. Walter,Jeffrey L. Linsky,Gösta F. Gahm,David R. Ardila,Alexander Brown,Christopher M. Johns-Krull,Michal Simon,Jeff A. Valenti +8 more
TL;DR: In this paper, the authors present far-ultraviolet (FUV) spectra of the T Tauri star RU Lup covering the 912-1710 A spectral range, as observed by the Hubble Space Telescope STIS and the Far Ultraviolet Spectroscopic Explorer satellite.
Journal ArticleDOI
The loopy UV line profiles of RU Lupi: accretion, outflows, and fluorescence
Gregory J. Herczeg,F. M. Walter,Jeffrey L. Linsky,Gösta F. Gahm,David R. Ardila,Alexander Brown,C. M. Johns-Krull,Michal Simon,J. A. Valenti +8 more
TL;DR: In this paper, the authors present far-ultraviolet spectra of the T Tauri star RU Lupi covering the 912-1710 A spectral range, as observed by the HST/STIS and FUSE satellites.
Journal ArticleDOI
Modelling circumbinary gas flows in close T Tauri binaries
TL;DR: In this article, the authors investigate how gas accretion takes place and evolves in close T Tauri binary systems and derive the density and velocity maps of the circumbinary material, employing two-dimensional hydrodynamic simulations with a locally isothermal equation of state.
Journal ArticleDOI
Mapping the Circumstellar Environment of T Tauri with Fluorescent H2 Emission
Frederick M. Walter,Gregory J. Herczeg,Alexander Brown,David R. Ardila,Gösta F. Gahm,Christopher M. Johns-Krull,Jack J. Lissauer,Michal Simon,Jeff A. Valenti +8 more
TL;DR: In this paper, the authors obtained three long-slit, far-UV spectra of the pre-main-sequence system T Tauri from the Hubble Space Telescope and showed that the on-source spectrum is composed of fluoresced H2 and stellar chromospheric lines.