Results 21 to 30 of about 3,378 (118)

X-Ray Emission of Massive Stars and Their Winds

open access: yes, 2022
Invited chapter of the Handbook of X-ray and Gamma-ray ...
openaire   +2 more sources

X-ray properties of early-type stars [PDF]

open access: yesSymposium - International Astronomical Union, 1994
Extensive stellar surveys with the Einstein Observatory (Chlebowski et al., 1989) and with ROSAT have clearly confirmed the presence of stellar X-ray emission over nearly the whole range of the HR diagram. In the ROSAT all-sky survey data approximately 20000 stellar X-ray sources were detected (Schmitt et al., 1992).
Thomas W. Berghöfer   +1 more
openaire   +1 more source

Flares in late-type stars: X-ray [PDF]

open access: yesInternational Astronomical Union Colloquium, 1995
Flare-like brightenings, similar to those observed on the Sun but on a larger energy scale, are observed in a variety of late-type stars, including classical M dwarf flare stars, RS CVn-type binaries and pre-main sequence (PMS) objects. These events, which are observable over the whole electromagnetic spectrum, are interpreted as due to rapid release ...
openaire   +1 more source

X-RAY STAR CLUSTERS IN THE CARINA COMPLEX [PDF]

open access: yesThe Astrophysical Journal Supplement Series, 2011
ABSTRACT The distribution of young stars found in the Chandra Carina Complex Project (CCCP) is examined for clustering structure. X-ray surveys are advantageous for identifying young stellar populations compared to optical and infrared surveys in suffering less contamination ...
Feigelson, Eric D.   +13 more
openaire   +2 more sources

The Sun as an X‐Ray Star. III. Flares [PDF]

open access: yesThe Astrophysical Journal, 2001
32 pages, 8 figures, 3 ...
Reale, F., Peres, G., Orlando, S.
openaire   +2 more sources

X-ray insights into star and planet formation [PDF]

open access: yesProceedings of the National Academy of Sciences, 2010
Although stars and planets form in cold environments, X-rays are produced in abundance by young stars. This review examines the implications of stellar X-rays for star and planet formation studies, highlighting the contributions of NASA’s (National Aeronautics and Space Administration) Chandra X-ray Observatory.
openaire   +2 more sources

Radio Emitting X-ray Binary Stars [PDF]

open access: yesInternational Astronomical Union Colloquium, 1996
Some of the most astrophysically interesting objects are found among the radio-emitting X-ray binary stars (REXRB). The class includes the well-studied objects such as SS 433, Cyg X-3 and Sco X-1. The recent discoveries of relativistic ejection of radio knots in the X-ray transients 1915+105 (Mirabel & Rodriguez 1994) and 1655–40 (Hjellming & ...
openaire   +1 more source

Properties of X-ray Flares on Young Stars [PDF]

open access: yesInternational Astronomical Union Colloquium, 1995
AbstractThe interest in the giant flares found on young stars results from the fact that their energetics is vastly different from solar flares. The recent ROSAT observations of young clusters yield a good basis for a systematic study of these flares.We have investigated 18 very deep pointed observations of star forming regions in IC348, Chamaeleon, ρ ...
Th. Preibisch, R. Neuhäuser
openaire   +1 more source

The neutron stars of Soft X-ray Transients

open access: yesAstronomy and Astrophysics Review, 1998
Soft X-ray Transients (SXRTs) have long been suspected to contain old, weakly magnetic neutron stars that have been spun up by accretion torques. After reviewing their observational properties, we analyse the different regimes that likely characterise the neutron stars in these systems across the very large range of mass inflow rates, from the peak of ...
Campana, S.   +4 more
openaire   +2 more sources

On X‐Ray Variability in Active Binary Stars

open access: yesThe Astrophysical Journal, 1999
We compare the count-rates of active binaries observed by Einstein and ROSAT. We find significant evidence for short-term variability (approx 0.32) and marginal evidence for a larger variability at longer timescales (approx 0.38). Modeling this excess as cyclic variability, we place an upper limit on the relative amplitude of the cyclic component ...
Kashyap, Vinay, Drake, Jeremy
openaire   +2 more sources

Home - About - Disclaimer - Privacy