Science Archives Publication System

Ultraviolet Detection of Interstellar ¹²C¹⁷O and the CO Isotopomeric Ratios toward X Persei

DOI: 10.1086/342501 Bibcode: 2002ApJ...574L.171S

Federman, S. R.; Lambert, David L.; Sheffer, Yaron

We report the detection of fully resolved absorption lines of A-X bands from interstellar ¹²C¹⁷O and ¹²C¹⁸O, through high-resolution spectroscopy of X Persei with the Space Telescope Imaging Spectrograph.3 The first ultraviolet measurement of an interstellar ¹²C¹⁷O column density sh…

2002 • The Astrophysical Journal

eHST 47

Trajectories of microwave prominence eruptions

DOI: 10.1051/0004-6361:20011658 Bibcode: 2002A&A...382..666H

Culhane, J. L.; Hori, K.

On the basis of 17 GHz microwave images from the Nobeyama Radioheliograph near solar maximum (1999-2000), we examined trajectories of 50 prominence eruptions in order to address how prominence motions affect or reflect the surrounding coronal structures. We marked the heliocentric latitude of the top of the moving prominences on the white-light sy…

2002 • Astronomy and Astrophysics

SOHO 47

XMM-Newton observations of the Seyfert 1 galaxy Mrk 335

DOI: 10.1051/0004-6361:20020435 Bibcode: 2002A&A...388...74G

Gondoin, P.; Santos-Lleo, M.; Orr, A. +1 more

We report on an XMM-Newton observation of the Seyfert 1 galaxy Mrk 335 performed in December 2000. The power law component of its spectrum above 2 keV has a photon index Gamma =2.3 much steeper than that of a ``normal'' Seyfert 1 galaxy. A broad spectral feature is observed around 6.0 keV (+/-1 keV) that can be fitted by a relativistic emission pr…

2002 • Astronomy and Astrophysics

XMM-Newton 47

The Nucleus of Comet 22P/Kopff and Its Inner Coma

DOI: 10.1006/icar.2001.6785 Bibcode: 2002Icar..156..442L

Jorda, L.; Lamy, P. L.; A'Hearn, M. F. +3 more

We report the detection of the nucleus of Comet 22P/Kopff with the Planetary Camera of the Hubble Space Telescope (HST) and with the Infrared Camera of the Infrared Space Observatory (ISOCAM). The HST observations were performed on 18 July 1996, 16 days after its perihelion passage of 2 July 1996, when it was at R_h=1.59 AU from the Sun …

2002 • Icarus

ISO eHST 46

The Dwarf Spheroidal Companions to M31: WFPC2 Observations of Andromeda III

DOI: 10.1086/340965 Bibcode: 2002AJ....124..332D

Da Costa, G. S.; Armandroff, T. E.; Caldwell, Nelson

The Hubble Space Telescope Wide Field Planetary Camera 2 has been used to image Andromeda III, a dwarf spheroidal (dSph) companion to M31. The resulting color-magnitude diagrams (CMDs) reveal for the first time the morphology of the horizontal branch (HB) in this dwarf galaxy. We find that like Andromeda I and Andromeda II, and like most of the Ga…

2002 • The Astronomical Journal

eHST 46

Variation of the low-degree solar acoustic mode parameters over the solar cycle

DOI: 10.1023/A:1021226503589 Bibcode: 2002SoPh..209..247J

Jiménez-Reyes, S. J.; Jiménez, A.; Roca Cortés, T.

VIRGO/SPM is a helioseismic sunphotometer on board SOHO that observes the disk-integrated sunlight irradiance at three different colors (red, green, and blue). The data obtained for SPM since the beginning of the SOHO mission, April 1996, to March 2001 have been used to study the differences of the p-mode parameters during the solar activity cycle…

2002 • Solar Physics

SOHO 46

Searching for the Physical Drivers of Eigenvector 1: From Quasars to Nanoquasars

DOI: 10.1086/341367 Bibcode: 2002ApJ...571L..77Z

Marziani, P.; Zamanov, R.

We point out an analogy between two accreting white dwarfs (CH Cyg and MWC 560) with jets and powerful quasars. In spite of the enormous difference in the mass of the central object (a factor ~10⁷), the emission lines are strikingly similar to those of I Zw 1 (the prototype ``narrow-line Seyfert 1'' nucleus whose spectrum is widely used…

2002 • The Astrophysical Journal

eHST 46

The Afterglow and Complex Environment of the Optically Dim Burst GRB 980613

DOI: 10.1086/341624 Bibcode: 2002ApJ...576..113H

McMahon, Richard G.; Halpern, Jules P.; Hjorth, Jens +15 more

We report the identification of the optical afterglow of GRB 980613 in R- and I-band images obtained between 16 and 48 hr after the gamma-ray burst. Early near-infrared (NIR) H and K' observations are also reported. The afterglow was optically faint (R~23) at discovery but did not exhibit an unusually rapid decay (power-law decay slope α<1.8 at…

2002 • The Astrophysical Journal

eHST 46

Analysis of colour-magnitude diagrams of rich LMC clusters: NGC 1831

DOI: 10.1051/0004-6361:20020692 Bibcode: 2002A&A...390..121K

Santiago, B. X.; Kerber, L. O.; Valls-Gabaud, D. +1 more

We present the analysis of a deep colour-magnitude diagram (CMD) of NGC 1831, a rich star cluster in the LMC. The data were obtained with HST/WFPC2 in the F555W ( ~ V) and F814W ( ~ I) filters, reaching m₅₅₅ ~ 25. We discuss and apply a method of correcting the CMD for sampling incompleteness and field star contamination. Efficient use …

2002 • Astronomy and Astrophysics

eHST 46

Extreme-Ultraviolet Absorption Lines in Lyα Forest Absorbers and the Oxygen Abundance in the Intergalactic Medium

DOI: 10.1086/342836 Bibcode: 2002ApJ...579..500T

Kriss, Gerard A.; Zheng, Wei; Davidsen, Arthur F. +2 more

We create stacked composite absorption spectra from Hubble Space Telescope Faint Object Spectrograph data from four quasi-stellar objects to search for absorption lines in the extreme-ultraviolet wavelength region associated with Lyα forest absorbers in the redshift range 1.6<z<2.9. We successfully detect O V λ630 in Lyα absorbers throughout…

2002 • The Astrophysical Journal

eHST 46