Science Archives Publication System

The secrets of T Pyxidis. I. UV observations

DOI: 10.1051/0004-6361:20054182 Bibcode: 2007A&A...461..593G

Selvelli, P.; Gilmozzi, R.

Aims:We study the UV spectral behavior of the recurrent nova T Pyx during 16 years of <sl>IUE observations.</sl>
Methods: We examined both the <sl>IUE line-by-line images and the extracted spectra in order to understand the reality and the origin of the observed spectral variations. We compare different extraction methods and…

2007 • Astronomy and Astrophysics

IUE 25

Hubble Space Telescope NICMOS Observations of NGC 1333: The Ratio of Stars to Substellar Objects

DOI: 10.1086/510901 Bibcode: 2007AJ....133.1321G

Schneider, Glenn; Meyer, Michael R.; Greene, Thomas P. +4 more

We present an analysis of NICMOS photometry and low-resolution grism spectroscopy of low-mass stars and substellar objects in the young star-forming region NGC 1333. Our goal is to constrain the ratio of low-mass stars to substellar objects down to 20M_Jup in the cluster, as well as constrain the cluster initial mass function (IMF) down …

2007 • The Astronomical Journal

eHST 25

Pre-main-sequence stars in the Lagoon Nebula (M8)*

DOI: 10.1111/j.1365-2966.2006.11217.x Bibcode: 2007MNRAS.374.1253A

Barbá, R. H.; Morrell, N. I.; Arias, J. I.

We report the discovery of new pre-main-sequence (PMS) stars in the Lagoon Nebula (M8) at a distance of 1.25 kpc, based on intermediate-resolution spectra obtained with the Boller & Chivens spectrograph at the 6.5-m Magellan I Telescope (Las Campanas Observatory, Chile). According to the spectral types, the presence of emission lines and the l…

2007 • Monthly Notices of the Royal Astronomical Society

eHST 25

Mid-Infrared Photometry of Mass-losing Asymptotic Giant Branch Stars

DOI: 10.1086/512612 Bibcode: 2007AJ....133.2310B

Corcione, L.; Guandalini, R.; Busso, M. +2 more

We present ground-based mid-IR imaging for 27 M-, S-, and C-type asymptotic giant branch (AGB) stars. The data are compared with those of the database available thanks to the IRAS, Infrared Space Observatory, Midcourse Space Experiment, and Two Micron All Sky Survey catalogs. Our goal is to establish relations between the IR colors, the effective …

2007 • The Astronomical Journal

ISO 25

Near-surface winds at the Huygens site on Titan: Interpretation by means of a general circulation model

DOI: 10.1016/j.pss.2007.04.011 Bibcode: 2007P&SS...55.1990T

Tokano, Tetsuya

This study aims at interpreting the zonal and meridional wind in Titan's troposphere measured by the Huygens probe by means of a general circulation model. The numerical simulation elucidates the relative importance of the seasonal variation in the Hadley circulation and Saturn's gravitational tide in affecting the actual wind profile. The observe…

2007 • Planetary and Space Science

Huygens 25

High resolution mapping of TiO₂ abundances on the Moon using the Hubble Space Telescope

DOI: 10.1029/2007GL029754 Bibcode: 2007GeoRL..3413203R

Pieters, C. M.; Ulmer, M. P.; Bell, J. F. +4 more

Samples of the lunar regolith returned by Apollo astronauts show large variations (0 to >10 wt%) in TiO₂ abundance indicating complex compositional zonation within the lunar mantle. A long held goal of the lunar science community is the accurate determination of TiO₂ abundances on the lunar surface through remote sensing m…

2007 • Geophysical Research Letters

eHST 25

ISO far-infrared observations of the high-latitude cloud L1642 . II. Correlated variations of far-infrared emissivity and temperature of "classical large" dust particles

DOI: 10.1051/0004-6361:20054599 Bibcode: 2007A&A...466..969L

Juvela, M.; Lemke, D.; Russeil, D. +2 more

Aims:Our aim is to compare the infrared properties of big, "classical" dust grains with visual extinction in the cloud L1642. In particular, we study the differences in grain emissivity between diffuse and dense regions in the cloud.
Methods: The far-infrared properties of dust are based on large-scale 100 µm and 200 &…

2007 • Astronomy and Astrophysics

ISO 25

Magnetic Stereoscopy of Coronal Loops in NOAA 8891

DOI: 10.1007/s11207-007-0370-z Bibcode: 2007SoPh..241..235F

Feng, L.; Inhester, B.; Gan, W. Q. +3 more

The Solar TErrestrial RElations Observatory (STEREO) requires powerful tools for the three-dimensional (3D) reconstruction of the solar corona. Here we test such a program with data from SOHO and TRACE. By taking advantage of solar rotation, a newly developed stereoscopy tool for the reconstruction of coronal loops is applied to the solar active r…

2007 • Solar Physics

SOHO 25

Cluster and nebular properties of the central star-forming region of NGC 1140

DOI: 10.1111/j.1365-2966.2007.12497.x Bibcode: 2007MNRAS.382.1877M

Crowther, P. A.; Smith, L. J.; de Grijs, R. +2 more

We present new high spatial resolution Hubble Space Telescope/Advanced Camera for Surveys (ACS) imaging of NGC 1140 and high spectral resolution Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph spectroscopy of its central star-forming region. The central region contains several clusters, the two brightest of which are clusters 1 an…

2007 • Monthly Notices of the Royal Astronomical Society

eHST 25

Doppler Velocities Measured in Coronal Emission Lines from a Bright Point Observed with the EUNIS Sounding Rocket

DOI: 10.1086/512185 Bibcode: 2007ApJ...656L..41B

Brosius, Jeffrey W.; Thomas, Roger J.; Rabin, Douglas M.

Spectroscopic measurements of a coronal bright point obtained with the Extreme Ultraviolet Normal Incidence Spectrograph (EUNIS) sounding rocket instrument on 2006 April 12 show both upflows and downflows in all five of the best observed emission lines. Relative velocities on opposite sides of the feature were found to be +/-15 km s^-1 i…

2007 • The Astrophysical Journal

SOHO 25