860 citations · 4.2k across the 78 of their papers we have counts for
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Absolute properties of the low-mass eclipsing binary CM Draconis
J. C. Morales, I. Ribas, C. Jordi +12
Spectroscopic and eclipsing binary systems offer the best means for determining accurate physical properties of stars, including their masses and radii. The data available for low-…
In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend
A. Prsa, E. F. Guinan, E. J. Devinney +1
During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidates for an RR Lyr-type component in an eclipsing binary system. Two of those have orbital periods that are t…
Artificial Intelligence Approach to the Determination of Physical Properties of Eclipsing Binaries. I. The EBAI Project
A. Prsa, E. F. Guinan, E. J. Devinney +5
Achieving maximum scientific results from the overwhelming volume of astronomical data to be acquired over the next few decades will demand novel, fully automatic methods of data a…
Astrobiology in the Environments of Main-Sequence Stars: Effects of Photospheric Radiation
M. Cuntz, L. Gurdemir, E. F. Guinan +1
We explore if carbon-based macromolecules (such as DNA) in the environments of stars other than the Sun are able to survive the effects of photospheric stellar radiation, such as U…
Astrobiological Effects of F, G, K and M Main-Sequence Stars
M. Cuntz, L. Gurdemir, E. F. Guinan +1
We focus on the astrobiological effects of photospheric radiation produced by main-sequence stars of spectral types F, G, K, and M. The photospheric radiation is represented by usi…
Evolution over Time of Magentic Dynamo Driven UV & X-ray Emissions of dG-M Stars and Effects on Hosted Planets
Edward F. Guinan, Scott G. Engle
The evolution over time of the magnetic activity and the resulting X-ray and UV coronal and chromospheric emissions of main-sequence dG, dK, and dM stars with widely different ages…
Polaris: Mass and Multiplicity
Nancy Remage Evans, Gail Schaefer, Howard E. Bond +9
Polaris, the nearest and brightest classical Cepheid, is a member of at least a triple system. It has a wide () physical companion, the F-type dwarf Polaris B. Polaris itself…
First Determination of the Distance and Fundamental Properties of an Eclipsing Binary in The Andromeda Galaxy
Ignasi Ribas, Carme Jordi, Francesc Vilardell +3
We present the first detailed spectroscopic and photometric analysis of an eclipsing binary in the Andromeda Galaxy (M31). This is a 19.3-mag semi-detached system with components o…
X-Ray Spectral Variability During an Outburst in V1118 Ori
M. Audard, M. Guedel, S. L. Skinner +5
We present results from a multi-wavelength campaign to monitor the 2005 outburst of the low-mass young star V1118 Ori. Although our campaign covers the X-ray, optical, infrared, an…
Evolution of the Solar Activity over Time and Effects on Planetary Atmospheres: I. High-energy Irradiances (1-1700 A)
I. Ribas, E. F. Guinan, M. Guedel +1
We report on the results of the Sun in Time multi-wavelength program (X-rays to the UV) of solar analogs with ages covering ~0.1-7 Gyr. The chief science goals are to study the sol…
Far-UV Emissions of the Sun in Time: Probing Solar Magnetic Activity and Effects on Evolution of Paleo-Planetary Atmospheres
Edward F. Guinan, Ignasi Ribas, Graham M. Harper
We present and analyze FUSE observations of six solar analogs. These are single, main-sequence G0-5 strs selected as proxies for the Sun at several stages of its main-sequence life…
Fundamental Properties and Distances of LMC Eclipsing Binaries: IV. HV 5936
E. L. Fitzpatrick, I. Ribas, E. F. Guinan +2
We have determined the fundamental properties and distance of a fourth eclipsing binary system (EB) in the Large Magellanic Cloud, HV5936 (B0.5 V + B2 III). As in our previous stud…
Are Coronae of Magnetically Active Stars Heated by Flares? II. EUV and X-Ray Flare Statistics and the Differential Emission Measure Distribution
Manuel Guedel, Marc Audard, Vinay L. Kashyap +2
(Abridged) We investigate the EUV and X-ray flare rate distribution in radiated energy of the late-type active star AD Leo using long EUVE and BeppoSAX observations. We compare the…
Fundamental Properties and Distances of LMC Eclipsing Binaries: III. EROS 1044
Ignasi Ribas, Edward L. Fitzpatrick, Frank P. Maloney +2
We present results from a detailed analysis of a third eclipsing binary (EB) system in the Large Magellanic Cloud, EROS 1044 (~B2 IV-V + ~B2 III-IV). Our study combines the "classi…
Astrometric and Light-travel Time Orbits to Detect Low-mass Companions: A Case Study of the Eclipsing System R Canis Majoris
Ignasi Ribas, Frederic Arenou, Edward F. Guinan
We discuss a method to determine orbital properties and masses of low-mass bodies orbiting eclipsing binaries. The analysis combines long-term eclipse timing modulations (light-tra…
A Systematic Spectroscopic X-Ray Study of Stellar Coronae with XMM-Newton: Early Results
M. Guedel, M. Audard, K. W. Smith +10
We have been conducting a comprehensive survey of stellar coronae with the XMM-Newton Reflection Grating Spectrometers during the commissioning, calibration, verification, and guar…
AD Leo from X-Rays to Radio: Are Flares Responsible for the Heating of Stellar Coronae?
M. Guedel, M. Audard, E. F. Guinan +4
In spring 1999, a long coordinated observing campaign was performed on the flare star AD Leo, including {\it EUVE}, {\it BeppoSAX}, the {\it VLA}, and optical telescopes. The campa…
An Ultraviolet Study of the Short-Period Binary OO Aquilae
Bruce J. Hrivnak, Edward F. Guinan, Laurence E. DeWarf +1
OO Aql is a rare W UMa-type eclipsing binary in which the two solar-type stars may have only recently evolved into contact. The binary has an unusually high mass ratio (0.84), and…
The Best Brown Dwarf Yet?: A Companion to the Hyades Eclipsing Binary V471 Tau
Edward F. Guinan, Ignasi Ribas
We have carried out an analysis of about 160 eclipse timings spanning over 30 years of the Hyades eclipsing binary V471 Tauri that shows a long-term quasi-sinusoidal modulation of…
Fundamental Properties and Distances of LMC Eclipsing Binaries II. HV 982
E. L. Fitzpatrick, I. Ribas, E. F. Guinan +3
We have determined the distance to a second eclipsing binary system (EB) in the Large Magellanic Cloud, HV982 (~B1 IV-V + ~B1 IV-V). The measurement of the distance -- among other…
Eclipsing Binaries as Astrophysical Laboratories: Internal Structure, Convective Core Overshooting and Evolution of the B-star Components of V380 Cygni
Edward F. Guinan, Ignasi Ribas, Edward L. Fitzpatrick +4
New photometric solutions have been carried out on the important eccentric eclipsing system V380 Cygni (B1.5II-III + B2V) from UBV differential photoelectric photometry obtained by…
The LMC eclipsing binary HV 2274: fundamental properties and comparison with evolutionary models
Ignasi Ribas, Edward F. Guinan, Edward L. Fitzpatrick +6
We are carrying out an international, multi-wavelength program to determine the fundamental properties and independent distance estimates of selected eclipsing binaries in the LMC…
The Distance to the Large Magellanic Cloud from the Eclipsing Binary HV2274
E. F. Guinan, E. L. Fitzpatrick, L. E. DeWarf +6
The distance to the Large Magellanic Cloud (LMC) is crucial for the calibration of the Cosmic Distance Scale. We derive a distance to the LMC based on an analysis of ground-based p…
9 Aurigae: Strong Evidence for Non-Radial Pulsations
Kevin Krisciunas, Roger F. Griffin, Edward F. Guinan +2
We present further photometric observations of the unusual F0 V star 9 Aurigae and present evidence that this star's radial velocity, spectroscopic line widths and line depths are…