Search Publications
Peculiarities of the UV Continuum Energy Distribution for T Tauri Stars
Lamzin, S. A.; Kravtsova, A. S.
In the UV spectra of BP Tau, GW Ori, T Tau, and RY Tau obtained with the Hubble Space Telescope, we detected an inflection near 2000 Angstrems in the F^clambda(lambda) curve that describes the continuum energy distribution. The inflection probably stems from the fact that the UV continuum in these stars consists of two components: the e…
ι Cassiopeiae: Orbit, Masses, and Photometry from Adaptive Optics Imaging in the I and H Bands
Roberts, Lewis C., Jr.; Drummond, Jack; Milster, Scott +1 more
The multiple-star system ι Cas was observed as a calibration for our adaptive optics observations in 2001 July with the Advanced Electro-Optical System (AEOS) 3.63 m telescope in Maui, Hawaii, and the first ever image of the faint astrometric component Aa (along with A and B) was obtained at the H-band wavelength. Another image was obtained in 200…
STIS Spectral Imagery of the OB Stars in NGC 604. I. Description of the Extraction Technique for a Crowded Stellar Field
Bruhweiler, Fred C.; Miskey, Cherie L.
We have developed a data reduction procedure to extract multiple spectra from a single two-dimensional Space Telescope Imaging Spectrograph (STIS) image of a crowded stellar field. This paper provides a description of our new technique, utilizing a STIS ultraviolet spectral image, acquired with the G140L grating and the 52"×2" aperture, sampling a…
Spectrophotometry of speckle binary stars. III
Al-Wardat, M. A.
Spectrophotometric observations of a third set consisting of 11 stars of speckle interferometric binaries are presented. Observations covered the range 3700-8400 Å with a resolution of 18 Å. Results are presented in the form of the measured flux corrected for atmospheric extinction in the units of erg/cm2·s·sÅ, with no corrections for i…
Photometric Study of the Eclipsing Binary VW Leonis Minoris .
Dumitrescu, Alexandru
VW LMi (HIP 54003) was discovered by HIPPARCOS/TYCHO as a W UMa variable. We carried out BV photometry of this star. A photometric solution is derived with the Djurasevic model. The binary, having the temperatures of the components approximately equal, is an overcontact system. Phase shifts of the light curve maxima were observed.
Carbon and Oxygen Coronal Line Intensities for the Electron κ-DistributionI
Dzifčáková, Elena; Kulinová, Alena
The ionization and excitation equilibrium of C and O for the electron κ-distribution in the solar corona is studied. The change of the distribution shape changes the ionization, recombination and excitation rates. These changes influence the relative ion abundance and the level populations. The ionization peaks are wider and the level populations …
Ulysses Observations at Solar Maximum: Introduction
Smith, Edward J.; Marsden, Richard G.
Observations during Ulysses' second solar orbit reveal basic changes between solar minimum and maximum. Fast high latitude wind disappeared in the southern hemisphere allowing slow wind to expand to all latitudes. In the north polar cap, both fast wind and a polar coronal hole were present. The magnetic field polarity reversal was detected in the …
Ultraviolet Structure in the Lensed QSO 0957+561
Hutchings, J. B.
Imaging and spectra of the lensed QSO pair 0957+561 are presented and discussed. The data are principally those from the Space Telescope Imaging Spectrograph near-UV MAMA and cover rest wavelengths from 850 to 1350 Å. The QSOs are both extended over about 1", with morphology that matches with a small rotation and includes one feature aligned with …
Hubble Space Telescope NICMOS Multiband Photometry of Proteus and Puck
Dumas, Christophe; Terrile, Richard J.; Smith, Bradford A.
We report 1.1-2.4 µm multiband photometry of the small Uranian satellites Puck and Portia and of the small Neptunian satellite Proteus obtained with the Hubble Space Telescope and its near-infrared camera NICMOS. The surface of Puck (and likely Portia) displays an absorption feature matching the 2.0 µm band of water ice. In the case of…
The Wind of the B[e] Supergiant Henize S22 Viewed through a Reflection Nebula in DEM L106
Oey, M. S.; Nazé, Yaël; Chu, You-Hua +5 more
Narrowband HST WFPC2 images reveal a bow-shock-like halo around the H II region N30B toward the B[e] supergiant Hen S22 located within the larger DEM L106 nebula in the Large Magellanic Cloud. High-dispersion spectra of N30B show a narrow Hα emission component from the ionized gas; the velocity variations indicate a gas flow of -5 to -10 km s…