Science Archives Publication System

Spatially and spectrally resolved 10 µm emission in Herbig Ae/Be stars

DOI: 10.1051/0004-6361:20034331 Bibcode: 2004A&A...418..177V

Waters, L. B. F. M.; Dominik, C.; van Boekel, R. +3 more

We present new mid-infrared spectroscopy of the emission from warm circumstellar dust grains in the Herbig Ae stars HD 100546, HD 97048 and HD 104237, with a spatial resolution of ≈0.9 arcsec. We find that the emission in the UIR bands at 8.6, 11.3 and (HD 97048 only) 12.7 µm is extended in the first two sources. The continuum emission is re…

2004 • Astronomy and Astrophysics

ISO 65

Unveiling the nature of three INTEGRAL sources through optical spectroscopy

DOI: 10.1051/0004-6361:200400078 Bibcode: 2004A&A...426L..41M

Palazzi, E.; Masetti, N.; Malizia, A. +2 more

The results of an optical spectroscopy campaign performed at the Astronomical Observatory of Bologna in Loiano (Italy) on three hard X-ray sources detected by INTEGRAL (IGR J17303-0601, IGR J18027-1455 and IGR J21247+5058) are presented. These data have allowed a determination of the nature for two of them, with IGR J17303-0601 being a low mass X-…

2004 • Astronomy and Astrophysics

INTEGRAL 65

Magnetic turbulent spectra in the magnetosheath: new insights

DOI: 10.5194/angeo-22-2283-2004 Bibcode: 2004AnGeo..22.2283S

Balogh, A.; Belmont, G.; Sahraoui, F. +4 more

Available from http://www.copernicus.org/site/EGU/annales/22/6/2283.htm?FrameEngine=false;

2004 • Annales Geophysicae

Cluster 65

Revealing the X-Ray Emission Processes of Old Rotation-powered Pulsars: XMM-Newton Observations of PSR B0950+08, PSR B0823+26, and PSR J2043+2740

DOI: 10.1086/424498 Bibcode: 2004ApJ...615..908B

Weisskopf, Martin C.; Tennant, Allyn F.; Becker, Werner +4 more

We have completed part of a program to study the X-ray emission properties of old rotation-powered pulsars with XMM-Newton in order to probe and identify the origin of their X-radiation. The X-ray emission from these old pulsars is largely dominated by nonthermal processes. None of the observed spectra required adding a thermal component consistin…

2004 • The Astrophysical Journal

XMM-Newton 65

AXPs and X-ray-dim isolated neutron stars: recent XMM-Newton and Chandra results

DOI: 10.1016/j.asr.2003.07.022 Bibcode: 2004AdSpR..33..638H

Haberl, F.

To date more than half a dozen X-ray-dim isolated neutron stars are known. Their X-ray spectra are characterized by soft blackbody-like emission ( kT∼50-120 eV) without indication for harder, non-thermal components. These stars apparently show no radio emission and no association with supernova remnants. Four of them exhibit pulsations in their X-…

2004 • Advances in Space Research

XMM-Newton 65

Interstellar Atomic Abundances

DOI: 10.48550/arXiv.astro-ph/0309651 Bibcode: 2004oee..symp..336J

Jenkins, Edward B.

A broad array of interstellar absorption features that appear in the ultraviolet spectra of bright sources allows us to measure the abundances and ionization states of many important heavy elements that exist as free atoms in the interstellar medium. By comparing these abundances with reference values in the Sun, we find that some elements have ab…

2004 • Origin and Evolution of the Elements

IUE 65

Structuring the HD 141569 A circumstellar dust disk. Impact of eccentric bound stellar companions

DOI: 10.1051/0004-6361:20031622 Bibcode: 2004A&A...414.1153A

Augereau, J. C.; Papaloizou, J. C. B.

Scattered light images of the optically thin dust disk around the 5 Myr old star HD 141569 A have revealed its complex asymmetric structure. We show in this paper that the surface density inferred from the observations presents similarities with that expected from a circumprimary disk within a highly eccentric binary system. We …

2004 • Astronomy and Astrophysics

eHST 65

A Multiwavelength Scattered Light Analysis of the Dust Grain Population in the GG Tauri Circumbinary Ring

DOI: 10.1086/383126 Bibcode: 2004ApJ...606..969D

Duchêne, G.; Ghez, A. M.; Macintosh, B. A. +1 more

We present the first 3.8 µm image of the dusty ring surrounding the young binary system GG Tau, obtained with the W. M. Keck II 10 m telescope's adaptive optics system. This is the longest wavelength at which the ring has been detected in scattered light so far, allowing a multiwavelength analysis of the scattering properties of the dust gra…

2004 • The Astrophysical Journal

eHST 65

Star formation rates of distant luminous infrared galaxies derived from Hα and IR luminosities

DOI: 10.1051/0004-6361:20034491 Bibcode: 2004A&A...415..885F

Elbaz, D.; Flores, H.; Cesarsky, C. J. +4 more

We present a study of the star formation rate (SFR) for a sample of 16 distant galaxies detected by ISOCAM at 15 µm in the CFRS0300+00 and CFRS1400+52 fields. Their high quality and intermediate resolution VLT/FORS spectra have allowed a proper correction of the Balmer emission lines from the underlying absorption. Extinction estimates using…

2004 • Astronomy and Astrophysics

ISO 65

Radio Observation of Electron Acceleration at Solar Flare Reconnection Outflow Termination Shocks

DOI: 10.1086/424374 Bibcode: 2004ApJ...615..526A

Mann, Gottfried; Aurass, Henry

Using meter-wave solar radio spectral observations of the 2001 September 28 flare, we discuss simultaneously appearing type II-like bursts observed at 40-80 MHz and ~300 MHz as radio signatures of the upper and lower reconnection outflow termination shock (TS). The features are identified during the impulsive phase but well after the regular trave…

2004 • The Astrophysical Journal

SOHO 64