Science Archives Publication System

Hubble Space Telescope NICMOS Imaging of the Core of M87

DOI: 10.1086/341169 Bibcode: 2002AJ....124..183C

Rieke, Marcia J.; Corbin, Michael R.; O'Neil, Earl

We present broadband 1.1, 1.6, and 2.2 µm images and a 2.37 µm narrowband image of the inner 19" of the nearby radio galaxy M87, obtained with the Near Infrared Camera and Multi-Object Spectrometer of the Hubble Space Telescope (HST). The isophotes of the broadband images are almost perfectly circular to within approximately 0.5" (~50 …

2002 • The Astronomical Journal

eHST 7

The Nature of [Ar III]-Bright Knots in the Crab Nebula

DOI: 10.1086/338310 Bibcode: 2002AJ....123..941S

Fesen, Robert A.; Schaller, Emily L.

The kinematic and morphological properties of a string of [Ar III]-bright knots in the Crab Nebula are examined using 1994-1999 Hubble Space Telescope (HST) Wide Field Planetary Camera 2 images of the remnant. We find that five southern [Ar III]-bright knots exhibit ordinary radial motions away from the nebula's center of expansion with magnitudes…

2002 • The Astronomical Journal

eHST 7

Microflaring of a solar bright point

DOI: 10.1051/0004-6361:20021024 Bibcode: 2002A&A...395..977V

Curdt, W.; Huovelin, J.; Vilhu, O. +2 more

A 50 x 50 arcsec region near the solar disc center containing a bright point (BP) was observed with the SUMER- spectrograph of the SOHO observatory. The data consist of two hours observation of four far-UV emission lines formed between 2 x 10⁴-6x 10⁵ K, with 2 arcsec spatial, 2.8 min temporal and 4 km s^-1 spectral …

2002 • Astronomy and Astrophysics

SOHO 7

Two-Dimensional Spectroscopy of Double-Barred Galaxies

DOI: 10.1134/1.1518713 Bibcode: 2002AstL...28..755M

Moiseev, A. V.

We describe the results of our spectroscopy for a sample of barred galaxies whose inner regions exhibit an isophotal twist commonly called a secondary bar. The line-of-sight velocity fields of the ionized gas and stars and the light-of-sight velocity dispersion fields of the stars were constructed from two-dimensional spectroscopy with the 6m Spec…

2002 • Astronomy Letters

eHST 7

Observations of Hipparcos short-period red giant stars

DOI: 10.1046/j.1365-8711.2002.05631.x Bibcode: 2002MNRAS.335..223K

Koen, Chris; van Wyk, Francois; Laney, Dave

Optical UBV(RI)_C and infrared JHK photometry is presented of a small sample of giant stars with short periods in the Hipparcos catalogue. Observations were limited, but were sufficient to rule out most of the Hipparcos periods. Radial velocity measurement were also made for a few stars, over six successive nights. Low-level variability …

2002 • Monthly Notices of the Royal Astronomical Society

Hipparcos 7

On the kinematic deconvolution of the local neighbourhood luminosity function

DOI: 10.1046/j.1365-8711.2002.04978.x Bibcode: 2002MNRAS.329..181P

Siebert, A.; Pichon, C.; Bienaymé, O.

A method for inverting the statistical star counts equation, including proper motions, is presented; in order to break the degeneracy in that equation, it uses the supplementary constraints required by dynamical consistency. The inversion gives access to both the kinematics and the luminosity function of each population in three régimes: the singu…

2002 • Monthly Notices of the Royal Astronomical Society

Hipparcos 7

An investigation into instrumental nonlinear effects

DOI: 10.1016/S0273-1177(02)80420-3 Bibcode: 2002AdSpR..30.2815W

Walker, S. N.; Balikhin, M. A.; Huff, R. +1 more

High order spectral techniques are one of the most powerful tools for the identification of non-linear processes in space plasma turbulence. Without such tools it is impossible to determine, for example, the occurrence of non-linear interactions between spectral components. However, since the observations made by an instrument involve some interna…

2002 • Advances in Space Research

Cluster 7

Radial velocities of population II binary stars. I.

DOI: 10.1002/1521-3994(200207)323:2<139::AID-ASNA139>3.0.CO;2-T Bibcode: 2002AN....323..139S

Bartkevicius, A.; Sperauskas, J.

Radial velocities for 114 Hipparcos stars, mostly high transverse velocity binaries without previous radial velocity measurements, are published. Measurements are made with the CORAVEL-type radial velocity spectrometer. The accuracy of measurements is better than 1 km/s. Two stars, BD +30 deg 2129A and HD 117466AB are found to be radial velocity v…

2002 • Astronomische Nachrichten

Hipparcos 7

The relation between far-UV and visible extinctions

DOI: 10.1016/S1384-1076(02)00098-2 Bibcode: 2002NewA....7..117Z

Zagury, Frederic

For directions of sufficient reddening ( E( B- V)>∼0.25), there is a simple relation between the slope of the extinction curve in the far-UV and E( B- V). Regardless of direction, the far-UV extinction curve is proportional to 1/ λⁿ e ^{-2 E( B- V)/ λ} ( λ in µm, n=4), in accordance with the idea that reddened stars spe…

2002 • New Astronomy

IUE 7

Observations of ultraviolet emission lines in solar coronal holes on the disk with SUMER on SOHO

DOI: 10.1016/S0273-1177(02)00330-7 Bibcode: 2002AdSpR..30..517W

Dammasch, Ingolf E.; Wilhelm, Klaus; Xia, Lidong

The Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrograph and other instruments on the Solar and Heliospheric Observatory (SOHO) have observed many solar polar coronal holes (PCHs) during the minimum of the sunspot cycle in 1996 and 1997. Based on the results obtained for PCHs, investigations of near-equatorial coronal holes (EC…

2002 • Advances in Space Research

SOHO 7