Science Archives Publication System

Multiplicity among chemically peculiar stars. II. Cool magnetic Ap stars

DOI: 10.1051/0004-6361:20021122 Bibcode: 2002A&A...394..151C

Babel, J.; Carrier, F.; Udry, S. +1 more

We present new orbits for sixteen Ap spectroscopic binaries, four of which might in fact be Am stars, and give their orbital elements. Four of them are SB2 systems: HD 5550, HD 22128, HD 56495 and HD 98088. The twelve other stars are: HD 9996, HD 12288, HD 40711, HD 54908, HD 65339, HD 73709, HD 105680, HD 138426, HD 184471, HD 188854, HD 200405 a…

2002 • Astronomy and Astrophysics

Hipparcos 106

Deep Hubble Space Telescope WFPC2 Photometry of NGC 288. I. Binary Systems and Blue Stragglers

DOI: 10.1086/339222 Bibcode: 2002AJ....123.1509B

Fusi Pecci, Flavio; Rood, Robert T.; Messineo, Maria +2 more

We present the first results of a deep WFPC2 photometric survey of the loose galactic globular cluster NGC 288. The fraction of binary systems is estimated from the color distribution of objects near the main sequence (MS) with a method analogous to that introduced by Rubenstein & Bailyn. We have unequivocally detected a significant population…

2002 • The Astronomical Journal

eHST 105

Identification of iron sulphide grains in protoplanetary disks

DOI: 10.1038/417148a Bibcode: 2002Natur.417..148K

Waters, L. B. F. M.; Mutschke, H.; Henning, T. +8 more

Sulphur is depleted in cold dense molecular clouds with embedded young stellar objects, indicating that most of it probably resides in solid grains. Iron sulphide grains are the main sulphur species in cometary dust particles, but there has been no direct evidence for FeS in astronomical sources, which poses a considerable problem, because sulphur…

2002 • Nature

ISO 104

On the intensity contrast of solar photospheric faculae and network elements

DOI: 10.1051/0004-6361:20020500 Bibcode: 2002A&A...388.1036O

Solanki, S. K.; Sanahuja, B.; Ortiz, A. +2 more

Sunspots, faculae and the magnetic network contribute to solar irradiance variations. The contribution due to faculae and the network is of basic importance, but suffers from considerable uncertainty. We determine the contrasts of active region faculae and the network, both as a function of heliocentric angle and magnetogram signal. To achieve thi…

2002 • Astronomy and Astrophysics

SOHO 104

Correlated Dynamics of Hot and Cool Plasmas in the Main Phase of a Solar Flare

DOI: 10.1086/340136 Bibcode: 2002ApJ...568L..61K

Wilhelm, K.; Curdt, W.; Dammasch, I. E. +1 more

We report far-ultraviolet observations of a solar limb flare obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer. At a fixed pointing of the slit above the limb, spectra were simultaneously obtained in several emission lines that covered a wide temperature range from ~10⁴ to ~10⁷ K. The te…

2002 • The Astrophysical Journal

SOHO 104

3D Coronal magnetic field from vector magnetograms: non-constant-alpha force-free configuration of the active region NOAA 8151

DOI: 10.1051/0004-6361:20020993 Bibcode: 2002A&A...392.1119R

Amari, T.; Régnier, S.; Kersalé, E.

The Active Region 8151 (AR 8151) observed in February 1998 is the site of an eruptive event associated with a filament and a S-shaped structure, and producing a slow Coronal Mass Ejection (CME). In order to determine how the CME occurs, we compute the 3D coronal magnetic field and we derive some relevant parameters such as the free magnetic energy…

2002 • Astronomy and Astrophysics

SOHO 103

The Structure of the Local Interstellar Medium. I. High-Resolution Observations of Fe II, Mg II, and Ca II toward Stars within 100 Parsecs

DOI: 10.1086/338650 Bibcode: 2002ApJS..139..439R

Redfield, Seth; Linsky, Jeffrey L.

High-resolution absorption measurements (λ/Δλ>~100,000) of the resonance lines of Fe II, Mg II, and Ca II are presented for all available observed targets within 100 pc. The Fe II and Mg II spectra were obtained with the Goddard High Resolution Spectrograph (GHRS) and the Space Telescope Imaging Spectrograph (STIS) instruments aboard the Hubble…

2002 • The Astrophysical Journal Supplement Series

eHST 103

Ultra-relativistic electrons in Jupiter's radiation belts

DOI: 10.1038/415987a Bibcode: 2002Natur.415..987B

Johnson, W. T. K.; Klein, M.; Hofstadter, M. +18 more

Ground-based observations have shown that Jupiter is a two-component source of microwave radio emission: thermal atmospheric emission and synchrotron emission from energetic electrons spiralling in Jupiter's magnetic field. Later in situ measurements confirmed the existence of Jupiter's high-energy electron-radiation belts, with evidence for elect…

2002 • Nature

Cassini 102

Galactic Starburst NGC 3603 from X-Rays to Radio

DOI: 10.1086/340491 Bibcode: 2002ApJ...573..191M

Ptak, A.; Corcoran, M. F.; Brandner, W. +10 more

NGC 3603 is the most massive and luminous visible starburst region in the Galaxy. We present the first Chandra ACIS-I X-ray image and spectra of this dense, exotic object, accompanied by a deep centimeter-wavelength Australia Telescope Compact Array radio image at similar <~1" spatial resolution and Hubble Space Telescope/ground-based optical d…

2002 • The Astrophysical Journal

eHST 102

Optical Identification of Multiple Faint X-Ray Sources in the Globular Cluster NGC 6752: Evidence for Numerous Cataclysmic Variables

DOI: 10.1086/339210 Bibcode: 2002ApJ...569..405P

Anderson, Scott F.; Kaspi, Victoria M.; Verbunt, Frank +8 more

We report on the Chandra X-Ray Observatory ACIS-S3 imaging observation of the globular cluster NGC 6752. We detect six X-ray sources within the 10.5" core radius and 13 more within the 115" half-mass radius down to a limiting luminosity of L_X~10³⁰ ergs s^-1 for cluster sources. We reanalyze archival data from the Hu…

2002 • The Astrophysical Journal

eHST 102