IUE observations of Hyades stars

Technical Report · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6940090

Zolcinski, M S; Antiochos, S K; Stern, R A; Walker, A B.C.

The authors have obtained short wavelength, low dispersion ultraviolet spectra of seven of the brightest X-ray emitting stars in the Hyades cluster with the IUE observatory. Four of the stars show evidence of emission lines characteristic of transition region temperatures (about 30,000 - 2000,000 K): for the remaining three stars, we derive upper limits for emission line fluxes. In addition, observed were three of the above stars with the long wavelength spectrograph on IUE at high dispersion and find evidence for chromospheric emission from the MG II h and k lines for two of these objects. Combining the IUE results with X-ray observations from the survey of the Hyades with the Einstein Observatory. The author estimated the differential emission measure function for each of the above stars. They derived constraints on stellar atmospheric parameters (chromospheric pressure, coronal temperature and filling factor), and discussed the implications of the results for models of stellar chromospheres and coronae.

• Research Organization: Stanford Univ., CA (USA). Inst. for Plasma Research
• OSTI ID: 6940090
• Report Number(s): AD-A-114411/2; SU-IPR-866
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CHROMOSPHERE
EMISSION SPECTRA
EXTRAPOLATION
NUMERICAL SOLUTION
PARAMETRIC ANALYSIS
SOLAR ATMOSPHERE
SPECTRA
STELLAR ATMOSPHERES
ULTRAVIOLET SPECTRA
X-RAY SPECTRA