Science Archives Publication System

Cyclical period changes in the dwarf novae V2051 Oph and V4140 Sgr

DOI: 10.1046/j.1365-8711.2003.07014.x Bibcode: 2003MNRAS.345..889B

Baptista, R.; Steiner, J. E.; Bond, H. E. +3 more

We report on the identification of cyclical changes in the orbital period of the eclipsing dwarf novae V2051 Ophiuchi and V4140 Sagittarii. We used sets of white dwarf mid-eclipse timings to construct observed-minus-calculated diagrams covering, respectively, 25 and 16 yr of observations. The V2051 Oph data present cyclical variations that can be …

2003 • Monthly Notices of the Royal Astronomical Society

eHST 43

Hubble Space Telescope Observations of Novae in M49

DOI: 10.1086/379349 Bibcode: 2003ApJ...599.1302F

Jordán, Andrés; Côté, Patrick; Ferrarese, Laura

A search for novae in M49 (NGC 4472) has been undertaken with the Hubble Space Telescope. A 55 day observing campaign in F555W (19 epochs) and F814W (five epochs) has led to the discovery of nine novae. We find that M49 may be underabundant in slow, faint novae relative to the Milky Way and M31. Instead, the decline rates of the M49 novae are rema…

2003 • The Astrophysical Journal

eHST 43

Erosion Model for the Sungrazing Comets Observed with the Solar and Heliospheric Observatory

DOI: 10.1086/378192 Bibcode: 2003ApJ...597.1237S

Sekanina, Zdenek

The objectives of this study are to model and interpret quantitatively the brightness variations of 27 Solar and Heliospheric Observatory (SOHO) sungrazers. The light curves, published by Uzzo et al. and by Biesecker et al., are shown to provide information on a proposed erosion process, which consists of continuous, progressive bulk fragmentation…

2003 • The Astrophysical Journal

SOHO 42

The Stellar Content of the Bulge of M31

DOI: 10.1086/374570 Bibcode: 2003AJ....125.2473S

Rich, R. Michael; Jablonka, Pascale; Frogel, Jay A. +6 more

We analyze the stellar populations present in M31 by using nine sets of adjacent Hubble Space Telescope NICMOS camera 1 and 2 fields with galactocentric distances ranging from 2' to 20'. These infrared observations provide some of the highest spatial resolution measurements of M31 to date; our data place tight constraints on the maximum luminositi…

2003 • The Astronomical Journal

eHST 42

Molecular Hydrogen in the Ring Nebula: Clumpy Photodissociation Regions

DOI: 10.1086/345911 Bibcode: 2003PASP..115..170S

Knezek, Patricia M.; Meixner, Margaret; Jacoby, George H. +1 more

We present a 0.65" resolution H₂ 1-0 S(1) 2.122 µm image of the Ring Nebula (NGC 6720), which was taken with the Near Infrared Imager at the WIYN 3.5 m telescope on Kitt Peak. The high resolution of the H₂ observation is sufficient to reveal the finer structure of the molecular material in this nebula. The morphology of…

2003 • Publications of the Astronomical Society of the Pacific

eHST 42

Space Telescope Imaging Spectrograph Spectroscopy of the Emission-Line Gas in the Nuclei of Nearby FR-I Galaxies

DOI: 10.1086/377251 Bibcode: 2003ApJS..148..419N

Baum, Stefi A.; O'Dea, Christopher P.; van der Marel, Roeland P. +4 more

We present the results of the analysis of a set of medium-resolution spectra, obtained by the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, of the emission-line gas present in the nuclei of a complete sample of 21 nearby, early-type galaxies with radio jets (the UGC FR-I Sample). For each galaxy nucleus we present spect…

2003 • The Astrophysical Journal Supplement Series

eHST 42

Wide-Field CCD Photometry of the Globular Cluster M92

DOI: 10.1086/376738 Bibcode: 2003AJ....126..815L

Lee, Hyung Mok; Lee, Myung Gyoon; Fahlman, Gregory G. +1 more

We present wide-field CCD photometry of the Galactic globular cluster M92 obtained in the V and I bands with the CFH12K mosaic CCD at the Canada-France-Hawaii Telescope. A well-defined color-magnitude diagram is derived down to 5 mag fainter than the cluster main-sequence turnoff. After removing the background contribution, we obtain luminosity an…

2003 • The Astronomical Journal

eHST 42

Tether-cutting Energetics of a Solar Quiet-Region Prominence Eruption

DOI: 10.1086/379164 Bibcode: 2003ApJ...599.1418S

Moore, Ronald L.; Sterling, Alphonse C.

We study the morphology and energetics of a slowly evolving quiet-region solar prominence eruption occurring on 1999 February 8-9 in the solar north polar crown region, using soft X-ray data from the soft X-ray telescope (SXT) on Yohkoh and Fe XV EUV 284 Å data from the EUV Imaging Telescope (EIT) on the Solar and Heliospheric Observatory (SOHO). …

2003 • The Astrophysical Journal

SOHO 42

Coronal Mass Ejection (CME)-induced shock formation, propagation and some temporally and spatially developing shock parameters relevant to particle energization

DOI: 10.1051/0004-6361:20031413 Bibcode: 2003A&A...412..293T

Wu, S. T.; Tsurutani, B.; Dryer, M. +1 more

Interplanetary shocks accelerate solar energetic particles (SEPs) from the point of shock formation in the lower corona, and continuously as the shock propagates outward to 1 AU and beyond. In this study, the formation properties of a CME-induced shock and propagation characteristics are studied from the inner corona to 1 AU. We use a 2D, three-co…

2003 • Astronomy and Astrophysics

SOHO 42

Discontinuity observations with cluster

DOI: 10.1016/S0273-1177(03)00335-1 Bibcode: 2003AdSpR..32..543K

Balogh, A.; Neubauer, F. M.; Horbury, T. +1 more

Observations of solar wind magnetic field discontinuities using four spacecraft allow their orientation to be estimated by relative timings referred to as triangulation. From February 1st until May 13th 2001 the Cluster orbit traversed the solar wind. During these periods we identified 489 directional discontinuities (DDs) using the Tsurutani-Smit…

2003 • Advances in Space Research

Cluster 42