activity
19932025
most citedEvolution of the Solar Activity over Time and Effects on Planetary Atmospheres: I. High-energy Irradiances (1-1700 A)

860 citations · 4.2k across the 78 of their papers we have counts for

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Showing 2009 · astro-ph.SRShow all

7 papers · 2 filters

astro-ph.SR2009★ 39 cited

A multi-wavelength study of the young star V1118 Orionis in outburst

M. Audard, G. S. Stringfellow, M. Güdel +6

Abriged version for astroph: The young late-type star V1118 Orionis was in outburst from 2005 to 2006. We followed the outburst with optical and near-infrared photometry; the X-ray…

astro-ph.SR2009★ 7 cited

Ultraviolet Study of the Active Interacting Binary Star R Arae using Archival IUE Data

Phillip A. Reed, George E. McCluskey, Yoji Kondo +7

The eclipsing and strongly interacting binary star system R Arae (HD149730) is in a very active and very short-lived stage of its evolution. R Ara consists of a B9V primary and an…

astro-ph.SR2009★ 18 cited

The Sun in Time: Age, Rotation, and Magnetic Activity of the Sun and Solar-type Stars and Effects on Hosted Planets

Edward F. Guinan, Scott G. Engle

Multi-wavelength studies of solar analogs (G0-5 V stars) with ages from ~50 Myr to 9 Gyr have been carried out as part of the "Sun in Time" program for nearly 20 yrs. From these st…

astro-ph.SR2009★ 1 cited

Mass Transport Processes and their Roles in the Formation, Structure, and Evolution of Stars and Stellar Systems

Kenneth G. Carpenter, Margarita Karovska, Carolus J. Schrijver +15

We summarize some of the compelling new scientific opportunities for understanding stars and stellar systems that can be enabled by sub-mas angular resolution, UV/Optical spectral…

astro-ph.SR2009★ 6 cited

The Secret XUV Lives of Cepheids: FUV/X-ray Observations of Polaris and beta Dor

Scott G. Engle, Edward F. Guinan, Joseph DePasquale +1

We report on the surprising recent discovery of strong FUV emissions in two bright, nearby Classical Cepheids from analyses of FUSE archival observations and one of our own approve…

astro-ph.SR2009★ 7 cited

Living with a Red Dwarf: FUV & X-ray emissions of dM stars and effects on hosted Planets

Scott G. Engle, Edward F. Guinan, Trisha Mizusawa

Red Dwarf (dM) stars are overwhelmingly the most numerous stars in our Galaxy. These cool, faint and low mass stars make up more than 80% of all stars. Also dM stars have extremely…