Science Archives Publication System

Hubble Space Telescope and Ground-based Spectroscopy of K648 in M15

DOI: 10.1086/322178 Bibcode: 2001AJ....122.1538B

Ford, Holland; Bianchi, Luciana; Bohlin, Ralph +2 more

We derive some element abundances for the central star of the planetary nebula K648 from analysis of Hubble Space Telescope Faint Object Spectrograph spectra (1200-3300 Å). Carbon is found to be approximately 4 times overabundant with respect to solar values, while oxygen is underabundant and silicon about solar, and He/H=0.6. The stellar continuu…

2001 • The Astronomical Journal

IUE eHST 24

Simultaneous Chandra and Hubble Space Telescope Observations of SMC X-1

DOI: 10.1086/338733 Bibcode: 2001ApJ...563L.139V

McCray, R.; Raymond, J. C.; Kallman, T. +3 more

We present first results from simultaneous ultraviolet (Hubble Space Telescope/STIS) and X-ray (Chandra/ACIS) observations of the SMC X-1/SK 160 eclipsing binary system. Observations covering four orbital phases during each of the X-ray high and X-ray low states were taken in 2000 October-November and 2001 April. The ultraviolet P Cygni lines show…

2001 • The Astrophysical Journal

eHST 24

Observations of Lyα Absorption in a Triple Quasar System

DOI: 10.1086/319054 Bibcode: 2001ApJ...549...76Y

Impey, C. D.; Foltz, C. B.; Young, P. A.

We have obtained follow-up observations of the quasar pair LBQS 0107-025A and B and new observations of the nearby quasar LBQS 0107-0232 with the Hubble Space Telescope Faint Object Spectrograph. Extended wavelength coverage of LBQS 0107-025A and B using the G270H grating was also obtained. This triple system is unique in providing sensitivity to …

2001 • The Astrophysical Journal

eHST 24

a First and 11 Recalculated Orbits of Double Stars

DOI: 10.2298/SAJ0163005O Bibcode: 2001SerAJ.163....5O

Olevic, D.; Jovanovic, P.

We present the first orbit for the pair CHARA 130 as well as recalculated orbits for the following double stars: ADS 161, ADS 207, ADS 293, ADS 1393 ADS 2531, ADS 5707, ADS 6126, ADS 6532, ADS 6623, ADS 11247 and ADS 16914. Also, the comparison of obtained dynamical with the Hipparcos parallaxes is made. U radu su prvi put izracunati putanjski ele…

2001 • Serbian Astronomical Journal

Hipparcos 23

Multi-wavelength bispectrum speckle interferometry of R Leo and comparison with Mira star models

DOI: 10.1051/0004-6361:20010968 Bibcode: 2001A&A...376..518H

Weigelt, G.; Hofmann, K. -H.; Balega, Y. +1 more

We present diffraction-limited (30 mas resolution) bispectrum speckle interferometry of the Mira star R Leo with the 6 m SAO telescope. The speckle interferograms were recorded through narrow-band interference filters with centre wavelength/bandwidth of 673 nm/8 nm (strong TiO absorption band), 656 nm/10 nm, 699 nm/6 nm and 781 nm/14 nm (moderate …

2001 • Astronomy and Astrophysics

Hipparcos 23

Ionizing Photons and Extreme-Ultraviolet Excesses in Clusters of Galaxies

DOI: 10.1086/320694 Bibcode: 2001ApJ...553L.129M

Bland-Hawthorn, J.; Maloney, Philip R.

Observations with the Extreme Ultraviolet Explorer satellite are purported to show extreme-ultraviolet (EUV) and soft X-ray excesses in several clusters of galaxies. If interpreted as thermal emission, this would imply the presence of warm (T~10⁶ K) gas in these clusters with a mass comparable to that of gas at coronal temperatures. If …

2001 • The Astrophysical Journal

eHST 23

Hubble Space Telescope-NICMOS Observations of M31'S Metal-Rich Globular Clusters and Their Surrounding Fields. II. Results

DOI: 10.1086/320388 Bibcode: 2001AJ....121.2597S

Rich, R. Michael; Jablonka, Pascale; Frogel, Jay A. +6 more

We have obtained HST-NICMOS observations of five of M31's most metal-rich globular clusters: G1, G170, G174, G177, and G280. For the two clusters farthest from the nucleus, G1 and G280, we statistically subtract the field population and estimate metallicities using K-(J-K) color-magnitude diagrams (CMDs). Based on the slopes of their infrared gian…

2001 • The Astronomical Journal

eHST 23

Dynamical variations of the differential rotation in the solar convection zone

DOI: 10.1051/0004-6361:20010345 Bibcode: 2001A&A...371..718C

Covas, E.; Moss, D.; Tavakol, R.

Recent analyses of helioseismological observations seem to suggest the presence of two new phenomena connected with the dynamics of the solar convective zone. Firstly, there are present torsional oscillations with periods of about 11 years, which penetrate significantly into the solar convection zone and secondly, oscillatory regimes exist near th…

2001 • Astronomy and Astrophysics

SOHO 23

Far Ultraviolet Spectroscopic Explorer Observations of a Supernova Remnant in the Line of Sight to HD 5980 in the Small Magellanic Cloud

DOI: 10.1086/323514 Bibcode: 2001ApJ...558L..35H

Blair, William P.; Hoopes, Charles G.; Sembach, Kenneth R. +1 more

We report a detection of far-ultraviolet absorption from the supernova remnant SNR 0057-7226 in the Small Magellanic Cloud (SMC). The absorption is seen in the Far Ultraviolet Spectroscopic Explorer (FUSE) spectrum of the luminous blue variable/Wolf-Rayet star HD 5980. Absorption from O VI λ1032 and C III λ977 is seen at a velocity of 300 km s

2001 • The Astrophysical Journal

eHST 23

ISO/SWS observations of SN 1987A. II. A refined upper limit on the mass of ⁴⁴Ti in the ejecta of SN 1987A

DOI: 10.1051/0004-6361:20010725 Bibcode: 2001A&A...374..629L

Sollerman, J.; Lundqvist, P.; Fransson, C. +1 more

ISO/SWS observations of SN 1987A on day 3425 show no emission in [Fe I] 24.05 mum and [Fe II] 25.99 mum down to the limits ~ 0.39 Jy and ~ 0.64 Jy, respectively. Assuming a homogeneous distribution of ⁴⁴Ti inside 2000 km s^-1 and negligible dust cooling, we have made time dependent theoretical models to estimate an upper limit…

2001 • Astronomy and Astrophysics

ISO 23