Science Archives Publication System

A photoionization model of the compact H II region G29.96-0.02

DOI: 10.1051/0004-6361:20020283 Bibcode: 2002A&A...386..558M

Morisset, C.; Schaerer, D.; Cox, P. +5 more

We present a detailed photoionization model of G29.96-0.02 (hereafter G29.96), one of the brightest Galactic Ultra Compact H Ii (UCHII) regions in the Galaxy. This source has been observed extensively at radio and infrared wavelengths. The most recent data include a complete ISO (SWS and LWS) spectrum, which displays a remarkable richness in atomi…

2002 • Astronomy and Astrophysics

ISO 41

Non-radial pulsation, rotation and outburst in the Be star omega Orionis from the MuSiCoS 1998 campaign

DOI: 10.1051/0004-6361:20020522 Bibcode: 2002A&A...388..899N

Stahl, O.; Kaper, L.; Smartt, S. J. +26 more

omega Ori (HD 37490, HR 1934) is a Be star known to have presented variations. In order to investigate the nature and origin of its short-term and mid-term variability, a study is performed of several spectral lines (Hα , Hdelta , ion {He}i 4471, 4713, 4921, 5876, 6678, ion {C}{ii} 4267, 657…

2002 • Astronomy and Astrophysics

IUE 41

M-Type Vega-like Stars

DOI: 10.1086/341164 Bibcode: 2002AJ....124..514S

Zuckerman, B.; Song, Inseok; Becklin, E. E. +2 more

We carried out a search for M-type Vega-like stars by correlating the IRAS Faint Source Catalog with Hipparcos-selected M-type stars. Three stars with apparent IRAS 25 µm excess emission are shown instead to be non-IR-excess stars from ground-based 11.7 and 17.9 µm photometry. Two stars previously suggested to have Vega-like mid-IR exc…

2002 • The Astronomical Journal

Hipparcos 41

2016+112: a gravitationally lensed type II quasar

DOI: 10.1046/j.1365-8711.2002.05438.x Bibcode: 2002MNRAS.334...39K

Lawrence, C. R.; Blandford, R. D.; Koopmans, L. V. E. +3 more

A single-screen model of the gravitational lens system 2016+112 is proposed, that explains recent Hubble Space Telescope (HST) infrared (NICMOS-F160W) observations and new high-resolution European VLBI Network (EVN) 5-GHz radio observations, presented in this paper. In particular, we find that a massive `dark' structure at the lens posit…

2002 • Monthly Notices of the Royal Astronomical Society

eHST 41

Subarcsecond Mid-Infrared Imaging of Two Post-Asymptotic Giant Branch 21 Micron Sources

DOI: 10.1086/340654 Bibcode: 2002ApJ...573..720K

Volk, Kevin; Kwok, Sun; Hrivnak, Bruce J.

High-resolution (FWHM 0.4") mid-infrared images have been obtained for two proto-planetary nebulae possessing the 21 µm emission feature (IRAS 07134+1005 and Z02229+6208). Images through five filters were obtained, covering the 11.3 and 21 µm emission features as well as the adjacent dust continuum. The images of IRAS 07134+1005 show a…

2002 • The Astrophysical Journal

eHST 41

Possible Recovery of SN 1961V in Hubble Space Telescope Archival Images

DOI: 10.1086/341695 Bibcode: 2002PASP..114..700V

Van Dyk, Schuyler D.; Filippenko, Alexei V.; Li, Weidong

SN 1961V in NGC 1058 was originally classified by Fritz Zwicky as a ``Type V'' supernova. However, it has been argued that SN 1961V was not a genuine supernova, but instead the superoutburst of an η Carinae-like luminous blue variable star. In particular, Filippenko et al. used pre-refurbishment Hubble Space Telescope (HST) Wide Field Planetary Ca…

2002 • Publications of the Astronomical Society of the Pacific

eHST 41

The Effects of Dust in Simple Environments: Large Magellanic Cloud H II Regions

DOI: 10.1086/324434 Bibcode: 2002ApJ...565..994B

Bell, Eric F.; Gordon, Karl D.; Zaritsky, Dennis +1 more

We investigate the effects of dust on Large Magellanic Cloud (LMC) H II region spectral energy distributions using arcminute-resolution far-ultraviolet (FUV), Hα, far-infrared (FIR), and radio images. Widely used indicators of the amount of light lost to dust (attenuation) at Hα and in the FUV correlate with each other, although often with substan…

2002 • The Astrophysical Journal

IUE 41

The Spectral Energy Distribution and Mass-Loss Rate of the A-Type Supergiant Deneb

DOI: 10.1086/339740 Bibcode: 2002ApJ...570..344A

Howarth, I. D.; Hauschildt, P. H.; Baron, E. +5 more

A stellar wind module has been developed for the PHOENIX stellar atmosphere code for the purpose of computing non-LTE, line-blanketed, expanding atmospheric structures and detailed synthetic spectra of hot luminous stars with winds. We apply the code to observations of Deneb, for which we report the first positive detections of millimeter and cent…

2002 • The Astrophysical Journal

IUE 41

Uncertainties in Dielectronic Recombination Rate Coefficients: Effects on Solar and Stellar Upper Atmosphere Abundance Determinations

DOI: 10.1086/338271 Bibcode: 2002ApJ...566.1166S

Laming, J. Martin; Savin, Daniel Wolf

We have investigated how the relative elemental abundances inferred from the solar upper atmosphere are affected by uncertainties in the dielectronic recombination (DR) rate coefficients used to analyze the spectra. We find that the inferred relative abundances can be up to a factor of ~5 smaller or ~1.6 larger than those inferred using the curren…

2002 • The Astrophysical Journal

SOHO 41

Large-Scale Solar Coronal Structures in Soft X-Rays and Their Relationship to the Magnetic Flux

DOI: 10.1086/341203 Bibcode: 2002ApJ...571L.181B

Kosovichev, A. G.; Benevolenskaya, E. E.; Scherrer, P. H. +2 more

We have investigated the relationship between magnetic activity and coronal structures using soft X-ray data from the Yohkoh soft X-ray telescope and magnetic field data from the Kitt Peak Solar Observatory for the period of 1991-2001 and EUV data from the Solar and Heliospheric Observatory EUV Imaging Telescope for 1996-2001. The data are reduced…

2002 • The Astrophysical Journal

SOHO 41