The UV Spectrum of the QSO OQ 172 Observed with the Faint Object Spectrograph

1995 ◽  
Vol 110 ◽  
pp. 1544 ◽  
Author(s):  
R. W. Lyons ◽  
Ross D. Cohen ◽  
Vesa T. Junkkarinen ◽  
E. Margaret Burbidge ◽  
E. A. Beaver
Keyword(s):  
Uv Spectrum ◽  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals Preliminary analysis of a Hubble FOS spectrum of VW Hyi in quiescence: A DAZQ white dwarf and accretion belt/ring

1996 ◽  
Vol 158 ◽  
pp. 249-250
Author(s):  
E. M. Sion ◽  
M. Huang ◽  
F. H. Cheng ◽  
I. Hubeny ◽  
P. Szkody
Keyword(s):  
White Dwarf ◽  
Preliminary Analysis ◽  
Hubble Space Telescope ◽  
Uv Spectrum ◽  
Space Telescope ◽  
Dwarf Nova ◽  
Faint Object ◽  
Faint Object Spectrograph

AbstractWe present a preliminary analysis of the UV spectrum of the dwarf nova VW Hyi during early quiescence, obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope (HST). The data were obtained approximately one day after the end of a normal outburst.

scholarly journals Several Possible Designs for BFOSC

1995 ◽  
Vol 149 ◽  
pp. 29-32
Author(s):  
Jiang Shi-Yang
Keyword(s):  
Faint Object ◽  
Faint Object Spectrograph

AbstractVarious optical solutions are presented for the Beijing Faint Object Spectrograph and Camera of Beijing Astrophysical Observatory 2.16 m telescope. They are based either on dioptric or catoptric designs including an adaptation of the existing Cassegrain spectrograph.

Observations of SN1985G and SN1985H with the new faint-object spectrograph

1987 ◽  
Vol 134 (2) ◽  
pp. 329-334 ◽  
Author(s):  
Alan Purvis ◽  
Gillian Pearce ◽  
I. Neill Reid
Keyword(s):  
Faint Object ◽  
Faint Object Spectrograph

scholarly journals Identification of a Complete Sample of Northern Rosat All-Sky Survey X-Ray Sources

1998 ◽  
Vol 179 ◽  
pp. 449-449
Author(s):  
J. Krautter ◽  
I. Thiering ◽  
F.-J Zickgraf ◽  
I. Appenzeller ◽  
R. Kneer ◽  
...  
Keyword(s):  
Optical Observations ◽  
Limited Sample ◽  
Ccd Imaging ◽  
X Ray ◽  
The North ◽  
Cluster Of Galaxies ◽  
Faint Object ◽  
Sky Survey ◽  
Faint Object Spectrograph ◽  
North Galactic

We present results of the optical identification of a spatially complete, flux limited sample of about 700 ROSAT All-Sky X-ray sources contained in 6 study areas north of δ = −9° with |bII|> 20° (including one region near the North Galactic pole (NGP), another one near the North Ecliptic pole (NEP)). Countrate limits are 0.01 cts s–1 near the NEP and 0.03 cts s–1 for the other areas. The optical observations were performed at the 2.15-m telescope of the Guillermo Haro Observatory, Mexico, using the Landessterwarte Faint Object Spectrograph Camera which allows to carry out direct CCD imaging and multi-object spectroscopy. The limiting magnitude is about 19m for spectroscopy and about 23m for B and R direct imaging. Our analysis shows a dependency of the ratio of ‘extragalactic’ (e.g., AGN, cluster of galaxies) to ‘stellar’ (e.g., coronal emitters, active binaries) counterparts on NH. In the area near the NGP (low NH) ‘extragalactic’ counterparts dominate, while in the area with the highest NH ‘stellar’ counterparts dominate.

scholarly journals HST FOS Observations of KPD0005+5106: A Subluminous WN-WC Descendant by Ongoing Mass Outflow?

1993 ◽  
Vol 155 ◽  
pp. 498-498
Author(s):  
Edward M. Sion ◽  
Ronald A. Downes
Keyword(s):  
Hubble Space Telescope ◽  
Absorption Lines ◽  
High Excitation ◽  
Strong Emission ◽  
Present Evidence ◽  
High Ionization ◽  
Faint Object ◽  
Mass Outflow ◽  
Line Widths ◽  
Faint Object Spectrograph

We report the results of spectroscopic observations of the ultra-high excitation, helium-rich, pre-white dwarf KPD0005+5106 obtained with the Hubble Space Telescope Faint Object Spectrograph (FOS) in 1991 May and July with the red (FOS/RD) and blue (FOS/BL) Digicon detectors. The data reveal a rich line spectrum both in absorption and in emission with ultra-high excitation species present including O VIII, N V, possibly C V, Fe VI, Fe VII and numerous weaker high n, low l, transitions of C IV and O VI as well as the predominant He II (3 → n) and He II (Balmer α) absorption lines. There is a strong emission complex at 2981A which we identify primarily as three transitions of N V commonly seen in WN Wolf-Rayet spectra. We present evidence that high ionization species in emission (O VIII, N V, C IV, Si IV) and in absorption (He II, Fe VI, Fe VII) are longward-shifted relative to the far UV resonance (circumstellar) absorption lines by 25–50 km/s. Based upon the detected species, line velocities, line widths and emission features, we conclude that (1) KPD0005 is the very likely the evolutionary descendant of a WN-WC subluminous Wolf-Rayet progenitor and (2) has ongoing, possibly episodic, mass outflow.

Visual and Near-Infrared Photometry of Nearby Dwarf Spheroidals

1999 ◽  
Vol 192 ◽  
pp. 455-458 ◽  
Author(s):  
F. Kerschbaum ◽  
W. Nowotny ◽  
J. Hron ◽  
M. Schultheis
Keyword(s):  
Near Infrared ◽  
Broad Band ◽  
Feasibility Studies ◽  
Asymptotic Giant Branch ◽  
Agb Stars ◽  
Faint Object ◽  
Nearby Galaxies ◽  
Dwarf Spheroidals ◽  
Faint Object Spectrograph ◽  
Infrared Survey

This paper is based on photometry from two different observational approaches. Both are of an explorative character and act as feasibility studies. For the future we plan to use these methods to study Asymptotic Giant Branch (AGB) stars in nearby galaxies.First, we present results on broad-band photometry in Bessell V and I, as well as narrow-band measurements in the Wing 778 nm and 812 nm filters of a galactic globular cluster using the new Austrian Oe-FOSC (Oesterreich Faint Object Spectrograph and Camera), a copy of the ESO Instrument EFOSC mounted on our 1.5 m-telescope.The second part of the contribution deals with the possibilities of using Gunn I, J and KS measurements originating from the DENIS (DEep Near Infrared Survey of the Southern Sky) project on similar objects. A few southern dwarf spheroidals already observed within DENIS (covering now some 40% of the southern hemisphere) are selected.

Faint object spectrograph observations of the low-luminosity Seyfert galaxy NGC 1566

1991 ◽  
Vol 377 ◽  
pp. L13 ◽  
Author(s):  
G. A. Kriss ◽  
G. F. Hartig ◽  
L. Armus ◽  
William P. Blair ◽  
S. Caganoff ◽  
...  
Keyword(s):  
Seyfert Galaxy ◽  
Faint Object ◽  
Faint Object Spectrograph
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