Results 141 to 150 of about 206 (176)

Constraints from Comets on the Formation and Volatile Acquisition of the Planets and Satellites. [PDF]

open access: yesSpace Sci Rev, 2015
Mandt KE   +6 more
europepmc   +1 more source

Coronal Holes. [PDF]

open access: yesLiving Rev Sol Phys, 2009
Cranmer SR.
europepmc   +1 more source

Accretion-powered chromospheres in classical T Tauri stars⋆ [PDF]

open access: yesAstronomy and Astrophysics, 2011
11 pages, 13 ...
Peter Petrov   +2 more
exaly   +3 more sources

Classical T Tauri Stars and Substellar Analogs

Astrophysics and Space Science, 2004
We propose a spectroscopic criterion based on Hα equivalent width and spectral type to classify classical T Tauri stars and substellar analogs. We argue that accreting objects can be identified from low-resolution optical spectroscopy, when their Hα flux is stronger than the saturation limit at Log {Lum(Hα)/Lum(bol)} = −3.3.
Navascués, D. Barrado Y   +3 more
openaire   +2 more sources

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