Science Archives Publication System

Factors Related to the Origin of a Gradual Coronal Mass Ejection Associated with an Eruptive Prominence on 1998 June 21-22

DOI: 10.1086/308749 Bibcode: 2000ApJ...534..468S

Srivastava, Nandita; Inhester, Bernd; Hanaoka, Yoichiro +2 more

We present observations of a coronal mass ejection (CME) associated with an eruptive prominence during 1998 June 21-22 by LASCO (Large Angle Spectroscopic Coronagraph) aboard SOHO (Solar and Heliospheric Observatory). Various features in the three-part structured, white-light CME as observed by LASCO-C2 and C3 coronagraphs were compared with featu…

2000 • The Astrophysical Journal

SOHO 55

Faint Blue Objects on the Hubble Deep Field North and South as Possible Nearby Old Halo White Dwarfs

DOI: 10.1086/308321 Bibcode: 2000ApJ...529..911M

Minniti, D.; Méndez, R. A.

Using data derived from the deepest and finest angular resolution images of the universe yet acquired by astronomers at optical wavelengths, with the Hubble Space Telescope (HST) in two postage-stamp sections of the sky, plus simple geometrical and scaling arguments, we demonstrate that the faint blue population of point-source objects detected in…

2000 • The Astrophysical Journal

eHST 55

The origin of silicate carbon stars: ISO/SWS observation of V778 Cygni

Bibcode: 2000A&A...363..629Y

Waters, L. B. F. M.; Dominik, C.; Yamamura, I. +2 more

The origin of silicate carbon stars has been a mystery ever since their discovery. We discuss here a full grating spectrum between 2.4 and 45 mu m of the silicate carbon star V778 Cyg obtained by the ISO/SWS. The spectrum, taken about 14 years after the IRAS LRS observation, confirms the complex nature of the object. The spectru…

2000 • Astronomy and Astrophysics

ISO 55

Identification of Solar Acoustic Modes of Low Angular Degree and Low Radial Order

DOI: 10.1086/312775 Bibcode: 2000ApJ...537L.143B

Kosovichev, A. G.; Henney, C. J.; García, R. A. +4 more

We present evidence for the detection of low radial order (n<10) acoustic modes of low angular degree, l=0-2, in the 759 day long Global Oscillations at Low Frequency and Michelson Doppler Imager time series. We used Random-Lag Singular Cross-Spectrum Analysis, which searches for simultaneous oscillatory components in two or more time series. W…

2000 • The Astrophysical Journal

SOHO 55

The puzzling theoretical predictions for the luminosity of clumping He burning stars

DOI: 10.48550/arXiv.astro-ph/9911432 Bibcode: 2000A&A...354..150C

Weiss, A.; Prada Moroni, P. G.; Degl'Innocenti, S. +3 more

This paper deals with theoretical predictions for He burning models in a range of masses covering the so-called Red Giant Branch phase transition. Taking as a guideline the observational constraints given by Hipparcos parallaxes to the predicted luminosity of models originated from Red Giant progenitors with He core undergoing electron degeneracy,…

2000 • Astronomy and Astrophysics

Hipparcos 55

Hubble Space Telescope Observations of the Planetary Nebula K648 in the Globular Cluster M15

DOI: 10.1086/301558 Bibcode: 2000AJ....120.2044A

Livio, Mario; Bond, Howard E.; Alves, David R.

We have obtained observations of the planetary nebula K648 in the Galactic globular cluster M15 with the Hubble Space Telescope's Wide Field Planetary Camera 2, covering an interval of 7 days. The frames provide both time-sampled broadband photometry of the central star and high-resolution images of the nebula in the light of Hα, [O III], and [N I…

2000 • The Astronomical Journal

IUE eHST 55

Hubble Space Telescope/WFPC2 and VLA Observations of the Ionized Gas in the Dwarf Starburst Galaxy NGC 4214

DOI: 10.1086/316841 Bibcode: 2000AJ....120.3007M

Walborn, Nolan R.; MacKenty, John W.; Maíz-Apellániz, Jesús +2 more

We present new Hα and [O III] λ5007 narrowband images of the starbursting dwarf galaxy NGC 4214, obtained with the Wide Field and Planetary Camera (WFPC2) on board the Hubble Space Telescope (HST), together with VLA observations of the same galaxy. The HST images resolve features down to physical scales of 2-5 pc, revealing several young (<10 M…

2000 • The Astronomical Journal

eHST 55

The Spectroscopic and Astrometric Parallaxes of Three Dwarf Novae: The Nature of the Secondary Stars of U Geminorum, SS Aurigae, and SS Cygni

DOI: 10.1086/316802 Bibcode: 2000AJ....120.2649H

Harrison, Thomas E.; Szkody, Paula; Gilliland, Ronald L. +1 more

We compare the parallaxes of three dwarf novae obtained using the Fine Guidance Sensors on the Hubble Space Telescope with their ground-based infrared spectroscopic parallaxes to examine the nature of their secondary stars. We have used new optical spectroscopy of MK spectral-type standards to rework the spectroscopic parallaxes of the reference f…

2000 • The Astronomical Journal

eHST 55

Transient correction of the LW-ISOCAM data for low contrasted illumination

DOI: 10.1051/aas:2000130 Bibcode: 2000A&AS..141..533C

Abergel, A.; Coulais, A.

The detector of the Long Wavelength channel of the ISOCAM camera on-board the Infrared Space Observatory (ISO) presents systematic memory effects of the response which can bias the photometry by a factor as high as 40%. We show that, for uniform illumination, the non linear model developed by \cite[Fouks and Schubert (1995)]{fou95} for the detecto…

2000 • Astronomy and Astrophysics Supplement Series

ISO 55

The Three-dimensional Structure of the Warm Local Interstellar Medium. I. Methodology

DOI: 10.1086/308205 Bibcode: 2000ApJ...528..756L

Redfield, Seth; Wood, Brian E.; Linsky, Jeffrey L. +1 more

In this first in a series of papers, we develop a methodology for constructing three-dimensional models of the local interstellar cloud (LIC) and adjacent warm clouds in the local interstellar medium (LISM). Our models are based on the column density of neutral hydrogen gas (N_HI) inferred primarily from measurements of the deuterium col…

2000 • The Astrophysical Journal

eHST 54