Science Archives Publication System

On the X-Ray Source Luminosity Distributions in the Bulge and Disk of M31: First Results from the XMM-Newton Survey

DOI: 10.1086/341131 Bibcode: 2002ApJ...571L..17T

Mason, Keith O.; Cordova, France A.; Trudolyubov, Sergey P. +2 more

We present luminosity distributions for the X-ray sources detected with XMM-Newton in the bulge and disk of the Andromeda galaxy (M31). The disk is clearly lacking the bright sources that dominate X-ray emission from the bulge. This is the first convincing evidence of a difference between bulge and disk X-ray populations in M31. Our results are in…

2002 • The Astrophysical Journal

XMM-Newton 25

Properties of ultraviolet lines observed with the Coronal Diagnostic Spectrometer (CDS/SOHO) in coronal holes and the quiet Sun

DOI: 10.1051/0004-6361:20011292 Bibcode: 2002A&A...381..653S

Solanki, S. K.; Brković, A.; Schühle, U. +4 more

We present an analysis of 14 ultraviolet emission lines belonging to different atoms and ions observed inside polar coronal holes and in the normal quiet Sun. The observations were made with the Coronal Diagnostic Spectrometer (CDS) onboard the Solar and Heliospheric Observatory (SOHO). This study extends previous investigations made with the Sola…

2002 • Astronomy and Astrophysics

SOHO 25

HUBBLE SPACE TELESCOPE Survey of Clusters in Nearby Galaxies. I. Detection and Photometry

DOI: 10.1086/338097 Bibcode: 2002AJ....123..207D

Dolphin, Andrew E.; Kennicutt, Robert C., Jr.

We have developed photometric techniques that can be applied to images with highly variable backgrounds, as well as to slightly extended objects (object size comparable to or smaller than point-spread function [PSF] size). We have shown that ordinary stellar PSF-fitting photometry can be applied to slightly extended objects provided that one appli…

2002 • The Astronomical Journal

eHST 25

XMM-Newton observations of the nearby brown dwarf LP 944-20

DOI: 10.1016/S1384-1076(02)00178-1 Bibcode: 2002NewA....7..595M

Bouy, Hervé; Martín, Eduardo L.

The nearby ( d=5.0 pc) brown dwarf LP 944-20 was observed with the XMM-Newton satellite on 07 January 2001. The target was detected with the Optical Monitor ( V=16.736±0.081), but it was not detected during the ≈48 ks observation with the X-ray telescopes. We determine a 3 σ upper limit for the X-ray emission from this object of L_X<3…

2002 • New Astronomy

XMM-Newton 25

An Upper Limit on the Temporal Variations of the Solar Interior Stratification

DOI: 10.1086/343063 Bibcode: 2002ApJ...580..574E

Eff-Darwich, A.; Korzennik, S. G.; Jiménez-Reyes, S. J. +1 more

We have analyzed changes in the acoustic oscillation eigenfrequencies measured over the past 7 years by the GONG, MDI, and LOWL instruments. The observations span the period from 1994 to 2001 that corresponds to half a solar cycle, from minimum to maximum solar activity. These data were inverted to look for a signature of the activity cycle on the…

2002 • The Astrophysical Journal

SOHO 25

The Ultraviolet Spectrum of the Ultracompact X-Ray Binary 4U 1626-67

DOI: 10.1086/344600 Bibcode: 2002AJ....124.3348H

Anderson, Scott F.; Wachter, Stefanie; Margon, Bruce +1 more

We have obtained Hubble Space Telescope/Space Telescope Imaging Spectrograph low-resolution ultraviolet spectra of the X-ray pulsar 4U 1626-67 (=KZ TrA); 4U 1626-67 is unusual even among X-ray pulsars because of its ultrashort binary period (P=41.4 minutes) and remarkably low mass function (<=1.3×10^-6 M_solar). The far-UV s…

2002 • The Astronomical Journal

eHST 25

H₂O in stellar atmospheres. II. ISO spectra of cool red giants and hydrostatic models

DOI: 10.1051/0004-6361:20021313 Bibcode: 2002A&A...395..915A

Kerschbaum, F.; Aringer, B.; Jörgensen, U. G.

We present 26 ISO-SWS spectra taken from a sample of 13 M-type Semiregular, Lb and Mira variables and covering the wavelength range between 2.36 and 5 mu m at a medium resolution. All of the studied objects show intense water bands producing a deep absorption dip around 2.5 mu m. Features of CO, OH, SiO and CO₂ are also visible. Using t…

2002 • Astronomy and Astrophysics

ISO 25

ISO LWS Spectra of T Tauri and Herbig AeBe stars

DOI: 10.1051/0004-6361:20020157 Bibcode: 2002A&A...385..546C

van Dishoeck, E. F.; Blake, G. A.; Chiang, E. I. +2 more

We present an analysis of ISO-LWS spectra of eight T Tauri and Herbig AeBe young stellar objects. Some of the objects are in the embedded phase of star-formation, whereas others have cleared their environs but are still surrounded by a circumstellar disk. Fine-structure lines of [OI] and [CII] are most likely excited by far-ultraviolet photons in …

2002 • Astronomy and Astrophysics

ISO 25

Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations

DOI: 10.1029/2001JA009195 Bibcode: 2002JGRA..107.1318B

Liu, Wei; Hoeksema, J. Todd; Scherrer, Philip H. +2 more

Solar mean magnetic field (SMMF) measurements from the Wilcox Solar Observatory and with the SOHO/MDI instrument are described and analyzed. Even though two completely different methods of observation are used, the two data sets obtained show a strong similarity. Using continuous wavelet transforms, SMMF variability is found at a number of tempora…

2002 • Journal of Geophysical Research (Space Physics)

SOHO 25

Multi-wavelength spectrophotometry of EX Hydrae

DOI: 10.1051/0004-6361:20011655 Bibcode: 2002A&A...382..984E

Gänsicke, B. T.; Beuermann, K.; Reinsch, K. +1 more

We present phase-resolved infrared and optical spectrophotometry of the intermediate polar EX Hya supplemented by archival ultraviolet data. The spin-modulated emission from the accretion funnel and the emission from the accretion disk or ring contain substantial optically thin components. The white dwarf dominates the unmodulated flux in the ultr…

2002 • Astronomy and Astrophysics

IUE eHST 25