Science Archives Publication System

Coronal mass ejection speeds measured in the solar corona using LASCO C2 and C3 images

DOI: 10.1016/S0273-1177(03)00909-8 Bibcode: 2003AdSpR..32.2619D

Stenborg, G.; Gonzalez, W. D.; Dal Lago, A. +1 more

In this work we present height-time diagrams of 2 halo coronal mass ejections, observed on September 28th, 1997 and June 29th, 1999. The CMEs were observed by the Large Angle and Spectroscopic Coronagraph (LASCO), which observes the solar corona from 2 to 32 solar radii. To obtain these diagrams we divide the LASCO images of a given sequence in an…

2003 • Advances in Space Research

SOHO 3

The resolved red giant branches of E/S0 galaxies

DOI: 10.1023/A:1024083220618 Bibcode: 2003Ap&SS.284..909S

Hopp, Ulrich; Schulte-Ladbeck, Regina E.; Drozdovsky, Igor O. +1 more

Formation paradigms for massive galaxies have long centered around two antipodal hypotheses – the monolithic-collapse and the accretion/merger scenarios. Empirical data on the stellar contents of galaxy halos is crucial in order to develop galaxy formation and assembly scenarios which have their root in observations, rather than in numerical simul…

2003 • Astrophysics and Space Science

eHST 3

Ultraviolet light curves of eclipsing binary stars. I. The catalogue of IUE data

DOI: 10.1016/S0273-1177(02)00632-4 Bibcode: 2003AdSpR..31..393P

Połubek, Grzegorz

The catalogue contains eclipsing and ellipsoidal variable stars observed by International Ultraviolet Explorer satellite (IUE). As examples we discuss IUE data for Algol (β Persei) and MR Cygni.

2003 • Advances in Space Research

IUE 3

Stellar population gradient in lenticular galaxies: NGC 1023, NGC 3115 and NGC 4203

DOI: 10.1051/0004-6361:20031261 Bibcode: 2003A&A...410..803B

Bassin, M.; Bonatto, Ch.

We investigate the stellar population content in the lenticular galaxies NGC 1023, NGC 3115 and NGC 4203 applying a population synthesis method based on a seven component spectral basis with different ages - 2.5*E⁶, 10*E⁶, 25*E⁶, 75*E⁶, 200*E⁶, 1.2*E⁹ and older than 10¹⁰ …

2003 • Astronomy and Astrophysics

eHST 3

Simultaneous observations of radio wave frequency and intensity fluctuations for estimates of solar wind speed

DOI: 10.1016/S0273-1177(03)00352-1 Bibcode: 2003AdSpR..32..485E

Bird, M. K.; Efimov, A. I.; Chashei, I. V. +1 more

A new method is developed for solar wind speed measurements based on simultaneous observations of radio wave temporal intensity and frequency fluctuations. An estimate of the solar wind convection velocity is obtained from a combination of the frequency (Doppler) fluctuation spectral power at low fluctuating frequency and the power in the flat par…

2003 • Advances in Space Research

Ulysses 3

Tests and constraints on theories of galaxy formation and evolution

DOI: 10.1023/A:1024034228409 Bibcode: 2003Ap&SS.284..353T

Thompson, Rodger I.

Tests and constraints on current theories of galaxy formation and evolution are presented. They are derived from observations of the Northern Hubble Deep Field with WFPC2 and NICMOS. Photometric redshifts, extinctions and spectral energy distributions are calculated for all objects in the field. The tests and constraints are derived from the outpu…

2003 • Astrophysics and Space Science

eHST 3

XMM-Newton observations of absorption features towards PKS 2155-304

DOI: 10.1016/S1387-6473(03)00093-9 Bibcode: 2003NewAR..47..561C

Maraschi, L.; Tavecchio, F.; Treves, A. +2 more

We present XMM-Newton grating spectra of the bright BL Lac object PKS 2155-304 taken in November 2000. Various absorption features are detected in the range 5-38 Å. The results are compared with those recently obtained with Chandra gratings [ApJ 573 (2002) 157; Nature, 421 (2003) 719]. We discuss whether the absorption occurs at the source (in the…

2003 • New Astronomy Reviews

XMM-Newton 3

JEM-X background models

DOI: 10.1051/0004-6361:20031364 Bibcode: 2003A&A...411L.253H

Oxborrow, C. A.; Huovelin, J.; Maisala, S. +4 more

Background and determination of its components for the JEM-X X-ray telescope on INTEGRAL are discussed. A part of the first background observations by JEM-X are analysed and results are compared to predictions. The observations are based on extensive imaging of background near the Crab Nebula on revolution 41 of INTEGRAL. Total observing time used…

2003 • Astronomy and Astrophysics

INTEGRAL 3

Spectroscopy of early-type star candidates in M 33 and NGC 6822. II

DOI: 10.1051/0004-6361:20030380 Bibcode: 2003A&A...403..111C

Bianchi, L.; Scuderi, S.; Catanzaro, G. +1 more

We present ground-based spectra of early-type star candidates in the Local Group galaxies M 33 and NGC 6822 taken at the 4.2 m William Herschel Telescope (La Palma, Spain). Photospheric parameters T_eff and log g were derived by LTE modeling of the Balmer lines. When possible, mass-loss rates were calculated from the H_alpha p…

2003 • Astronomy and Astrophysics

eHST 3

Temperature Measurements in the Solar Transition Region Using N III Line Intensity Ratios

DOI: 10.1086/375185 Bibcode: 2003ApJ...590.1121D

Bhatia, A. K.; Doschek, G. A.; Feldman, U. +2 more

UV emission from B-like N and O ions offers a rather rare opportunity for recording spectral lines in a narrow wavelength range that can potentially be used to derive temperatures relevant to the solar transition region. In these ions, the line intensity ratios of the type (2s2p²-2p³)/(2s²2p-2s2p²) are v…

2003 • The Astrophysical Journal

SOHO 3