Science Archives Publication System

Solar energetic particle event and radio bursts associated with the 1996 July 9 flare and coronal mass ejection

Bibcode: 2000A&A...360..729L

Laitinen, T.; Torsti, J.; Klein, K. -L. +6 more

Using spaceborne particle and gamma-ray detection and radio diagnostics we study solar energetic particle (SEP) production in the 1996 July 9 event. This event is associated with an impulsive soft X-ray flare (9:10 UT) and a coronal mass ejection (CME). In a global classification the event is considered as mixed-impulsive. A sequence of accelerati…

2000 • Astronomy and Astrophysics

SOHO 44

Do All BA II Stars Have White Dwarf Companions?

DOI: 10.1086/308678 Bibcode: 2000ApJ...533..969B

Carpenter, Kenneth; Robinson, Richard; Böhm-Vitense, Erika +2 more

With the Hubble Space Telescope (HST) and the Goddard High Resolution Spectrograph (GHRS) we have observed four barium stars, three mild barium stars, and one weak G-band star in the ultraviolet spectral region. One barium star was observed with HST and the Space Telescope Imaging Spectrograph (STIS). The aim was to check the hypothesis that all t…

2000 • The Astrophysical Journal

eHST 44

Non-equilibrium H_2 ortho-to-para ratio in two molecular clouds of the Galactic Center

DOI: 10.48550/arXiv.astro-ph/0002478 Bibcode: 2000A&A...356..695R

Rodríguez-Fernández, N. J.; Martín-Pintado, J.; Fuente, A. +4 more

We present ISO observations of the S(0), S(1), S(2), and S(3) rotational lines of molecular hydrogen from two molecular clouds near the Galactic Center (GC). We have also measured continuum dust emission at infrared wavelengths with ISO and the rotational radio lines J=1-0 of ¹³CO and C¹⁸O and J=2-1 of C¹⁸O with th…

2000 • Astronomy and Astrophysics

ISO 43

Detection of the Entropy of the Intergalactic Medium: Accretion Shocks in Clusters, Adiabatic Cores in Groups

DOI: 10.1086/309500 Bibcode: 2000ApJ...542..106T

Tozzi, Paolo; Norman, Colin; Scharf, Caleb

The thermodynamics of the diffuse, X-ray-emitting gas in clusters of galaxies is linked to the entropy level of the intracluster medium. In particular, models that successfully reproduce the properties of local X-ray clusters and groups require the presence of a minimum value for the entropy in the center of X-ray halos. Such a minimum entropy is …

2000 • The Astrophysical Journal

XMM-Newton 43

First detections of FIRBACK sources with SCUBA

DOI: 10.48550/arXiv.astro-ph/9910428 Bibcode: 2000A&A...357L...5S

Clements, D. L.; Dole, H.; Lagache, G. +10 more

The FIRBACK (Far InfraRed BACKground) survey represents the deepest extensive 170 µm images obtained by the ISO satellite. The sources detected comprise about 10% of the Cosmic IR Background (CIB) seen by COBE, and, importantly, were observed at a wavelength near the peak of the CIB. Detailed follow-up of these sources should help pin down t…

2000 • Astronomy and Astrophysics

ISO 43

Observations of the Trans-Neptunian Objects 1993 SC and 1996 TL₆₆ with the Infrared Space Observatory

DOI: 10.1086/308724 Bibcode: 2000ApJ...534..446T

Jorda, L.; Rauer, H.; Keller, H. U. +7 more

Observations at 90 µm of the trans-Neptunian objects (TNOs), 1993 SC and 1996 TL₆₆, using the Infrared Space Observatory (ISO) are reported. Five individual observations of 1993 SC were acquired giving a 2.7 σ detection (a confidence level of 99.6%). The signal level of 11.46+/-4.24 mJy has been modeled using a standard thermal mo…

2000 • The Astrophysical Journal

ISO 43

Time Variability of Rotation in Solar Convection Zone From soi-mdi

DOI: 10.1023/A:1005223308315 Bibcode: 2000SoPh..192..437T

Thompson, M. J.; Howe, R.; Christensen-Dalsgaard, J. +3 more

The variation of rotation in the convection zone over a period of two years from mid-1996 is studied using inversions of SOI-MDI data. We confirm the existence of near-surface banded zonal flows migrating towards the equator from higher latitudes, and reveal that these banded flows extend substantially beneath the surface, possibly to depths as gr…

2000 • Solar Physics

SOHO 43

The Tip of the Red Giant Branch Distance to the Large Magellanic Cloud

DOI: 10.1086/301266 Bibcode: 2000AJ....119.1197S

Zaritsky, Dennis; Sakai, Shoko; Kennicutt, Robert C., Jr.

We present the I-band luminosity function of the red giant branch stars in the Large Magellanic Cloud (LMC) using the data from the Magellanic Clouds Photometric Survey (MCPS). By selecting stars in uncrowded, low-extinction regions, we observe a discontinuity in the luminosity function at I₀=14.54 mag. Identifying this feature with the…

2000 • The Astronomical Journal

Hipparcos 43

Extremely Red Objects in the Field of QSO 1213-0017: A Galaxy Concentration at Z=1.31

DOI: 10.1086/301399 Bibcode: 2000AJ....119.2556L

Dickinson, Mark E.; Steidel, Charles C.; Graham, James R. +4 more

We have discovered a concentration of extremely red objects (EROs; R-K>6) in the field of the z=2.69 quasar QSO 1213-0017 (UM 485), which is a significant overabundance compared with the field ERO surface density. The optical/near-IR colors of the EROs and numerous other red galaxies in this field are consistent with elliptical galaxies at z=1-…

2000 • The Astronomical Journal

eHST 43

Rapid photometry of supernova 1987A: a 2.14 ms pulsar?

DOI: 10.1016/S1384-1076(00)00024-5 Bibcode: 2000NewA....5..243M

Kristian, Jerome A.; Danks, Anthony C.; Kunkel, William E. +9 more

We have monitored Supernova 1987A in optical/near-infrared bands using various high-speed photometers from a few weeks following its birth until early 1996 in order to search for a pulsar remnant. While we have found no clear evidence of any pulsar of constant intensity and stable timing, we have found emission with a complex period modulation nea…

2000 • New Astronomy

eHST 43