A sample of 7 new stars ranging in metallicity from [Fe/H]=−2.0 to [Fe/H]=−0.75 has been analyzed in the boron spectral region. The spectra were observed with the Goddard High Resolution Spectrograph (GHRS) of the Hubble Space Telescope (HST). The targets were selected on the basis of their lithium and beryllium abundances in order to investigate in a more complete way light element depletion a...

We report the detection of N V 1239Å transition region emission in HST/GHRS spectra of the A7 V stars, α Aql and α Cep. Our observations provide the first direct evidence of 1− 3 × 10 K material in the atmospheres of normal A-type stars. For both stars, and for the mid-A–type star τ 3 Eri, we also report the detection of chromospheric emission in the Si III 1206Å line. At a B−V color of 0.16 an...

Primate growth hormone (GH) has evolved rapidly, having undergone approximately 30% amino acid substitutions from the inferred ancestral eutherian sequence. Nevertheless, human growth hormone (hGH) is physiologically effective when administered to nonprimate mammals. In contrast, its functional counterpart, the human growth hormone receptor (hGHR), has evolved species specificity so that it res...

We present a series of systematic abundance measurements for 25 hot DA white dwarfs in the temperature range ~20000-110000K, based on far-UV spectroscopy with STIS/GHRS on HST, IUE and FUSE. Using our latest heavy element blanketed non-LTE stellar atmosphere calculations we have addressed the heavy element abundance patterns making completely objective measurements of abundance values and upper...

We present HST spectroscopy and imaging, along with new ground-based spectroscopy and ROSAT HRI imaging, of the He II emitting nebula N44C and its ionizing star. A GHRS spectrogram of the ionizing star yields a spectral type of about O7 for the star. The lack of P Cygni profiles for Si IV and C IV indicates that the star is not a supergiant. The nebular abundances in the ionized gas are consist...

We present interstellar absorption-line measurements of the ions S III and Al III toward the stars b1 Sco, k Col, m Per, f Oph, o Leo, and HD 18100 using archival data from the Goddard High-Resolution Spectrograph on board the Hubble Space T elescope. The ions Al III and S III trace heavily depleted and nondepleted elements, respectively, in ionized gas along the sight lines to these late-O/ear...

Observations of the C iv and Mg ii absorption lines in the Seyfert 1 galaxy NGC 4151 obtained with the GHRS in October 1994 are presented. The data from the STScI archive show multiple broad and narrow components in both species. In addition to Galactic absorption, four narrow and four broad systems associated with NGC 4151 are identified. Two broad systems dominate the total equivalent width, ...

GHRS high resolution spectra of β Pictoris were obtained to study the stable gas around this star. Several elements are detected and their abundances measured. Upper limits to the abundances of others are also measured. The data permit improved chemical analysis of the stable gas around β Picto-ris, and yield new and more accurate estimates of the radiation pressure acting on various elements. ...

Goddard High Resolution Spectrograph echelle-mode observations of the interstellar absorption lines of Mg II, Si IV, C IV, and N V toward k Columbae (HD 38666) are presented. The observations have a spectral resolution of 3.5 km s~1 and signal-to-noise ratios (S/Ns) of 20È200. The k Col sight line (l\ d \ 0.40 kpc, z\ [0.18 kpc) extends though the Local Bubble and the warm 237¡.3, b \ [27¡.1, n...

In subprimates, significant onset of growth hormone receptor (GHR) expression occurs only after birth whereas, in the human, GHR mRNA and protein are widely manifest from the first trimester of fetal life. Thus, it is likely that subprimates are not the best models for studying regulation of human GHR gene transcription, especially during early stages in development. Here we have explored the p...