Far‐Ultraviolet Space Telescope Imaging Spectrometer Spectra of the White Dwarf REJ 1032+532. I. Interstellar Line of Sight

1999 ◽  
Vol 517 (2) ◽  
pp. 841-849 ◽  
Author(s):  
J. B. Holberg, ◽  
F. C. Bruhweiler, ◽  
M. A. Barstow ◽  
P. D. Dobbie
Keyword(s):  
White Dwarf ◽  
Line Of Sight ◽  
Imaging Spectrometer ◽  
Space Telescope ◽  
Far Ultraviolet

scholarly journals A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455−282, WD0621−376, and WD2211−495

2019 ◽  
Vol 487 (3) ◽  
pp. 3470-3487 ◽  
Author(s):  
Simon P Preval ◽  
Martin A Barstow ◽  
Matthew Bainbridge ◽  
Nicole Reindl ◽  
Thomas Ayres ◽  
...  
Keyword(s):  
White Dwarf ◽  
White Dwarfs ◽  
Hubble Space Telescope ◽  
Line Of Sight ◽  
Hot Metal ◽  
Dwarf Stars ◽  
High Resolution Data ◽  
White Dwarf Stars ◽  
Order Of Magnitude ◽  
Far Ultraviolet

ABSTRACT Using newly obtained high-resolution data (R ∼ 1 × 105) from the Hubble Space Telescope, and archival UV data from the Far Ultraviolet Spectroscopic Explorer, we have conducted a detailed UV survey of the three hot, metal-polluted white dwarfs WD0455−282, WD0621−376, and WD2211−495. Using bespoke model atmospheres, we measured Teff, log g, and photospheric abundances for these stars. In conjunction with data from Gaia, we measured masses, radii, and gravitational redshift velocities for our sample of objects. We compared the measured photospheric abundances with those predicted by radiative levitation theory, and found that the observed Si abundances in all three white dwarfs, and the observed Fe abundances in WD0621−376 and WD2211−495, were larger than those predicted by an order of magnitude. These findings imply not only an external origin for the metals, but also ongoing accretion, as the metals not supported by radiative levitation would sink on extremely short time-scales. We measured the radial velocities of several absorption features along the line of sight to the three objects in our sample, allowing us to determine the velocities of the photospheric and interstellar components along the line of sight for each star. Interestingly, we made detections of circumstellar absorption along the line of sight to WD0455−282 with three velocity components. To our knowledge, this is the first such detection of multicomponent circumstellar absorption along the line of sight to a white dwarf.

Far‐Ultraviolet Space Telescope Imaging Spectrograph Spectra of the White Dwarf REJ 1032+532. II. Stellar Spectrum

1999 ◽  
Vol 517 (2) ◽  
pp. 850-858 ◽  
Author(s):  
J. B. Holberg ◽  
M. A. Barstow ◽  
F. C. Bruhweiler ◽  
I. Hubeny ◽  
E. M. Green
Keyword(s):  
White Dwarf ◽  
Stellar Spectrum ◽  
Space Telescope ◽  
Far Ultraviolet ◽  
Imaging Spectrograph

scholarly journals A comprehensive near- and far-ultraviolet spectroscopic study of the hot DA white dwarf G191-B2B

2013 ◽  
Vol 436 (1) ◽  
pp. 659-674 ◽  
Author(s):  
S. P. Preval ◽  
M. A. Barstow ◽  
J. B. Holberg ◽  
N. J. Dickinson
Keyword(s):  
Spectroscopic Study ◽  
White Dwarf ◽  
Far Ultraviolet

scholarly journals A Hubble Space Telescope STIS Observation of VW Hydri at the Exact Far-Ultraviolet Onset of an Outburst

2004 ◽  
Vol 614 (1) ◽  
pp. L61-L64 ◽  
Author(s):  
Edward M. Sion ◽  
F. H. Cheng ◽  
Boris T. Gänsicke ◽  
Paula Szkody
Keyword(s):  
Hubble Space Telescope ◽  
Space Telescope ◽  
Far Ultraviolet

scholarly journals [ITAL]Hubble Space Telescope[/ITAL] Observations of the Dwarf Nova WZ Sagittae: A Very Rapidly Rotating White Dwarf

1997 ◽  
Vol 484 (2) ◽  
pp. L149-L152 ◽  
Author(s):  
F. H. Cheng ◽  
Edward M. Sion ◽  
Paula Szkody ◽  
Min Huang
Keyword(s):  
White Dwarf ◽  
Hubble Space Telescope ◽  
Space Telescope ◽  
Dwarf Nova

Hubble Space Telescope Observations of White Dwarf Stars

1993 ◽  
pp. 295-302
Author(s):  
Harry L. Shipman ◽  
Maurice Barnhill ◽  
Howard Bond ◽  
Fred Bruhweiler ◽  
David Finley ◽  
...  
Keyword(s):  
White Dwarf ◽  
Hubble Space Telescope ◽  
Dwarf Stars ◽  
Space Telescope ◽  
White Dwarf Stars

scholarly journals Chromatic Amplitudes and Line-of-Sight Velocity Variations for the Pulsating DB White Dwarf GD 358

2002 ◽  
Vol 185 ◽  
pp. 380-381
Author(s):  
R. Kotak
Keyword(s):  
Optical Spectroscopy ◽  
White Dwarf ◽  
Line Of Sight ◽  
Time Resolved ◽  
Preliminary Results ◽  
Velocity Variations

AbstractWe report on preliminary results from time-resolved optical spectroscopy of the He-rich variable white dwarf GD 358.

scholarly journals The HST large programme on NGC 6752 – III. Detection of the peak of the white dwarf luminosity function

2019 ◽  
Vol 488 (3) ◽  
pp. 3857-3865
Author(s):  
L R Bedin ◽  
M Salaris ◽  
J Anderson ◽  
M Libralato ◽  
D Apai ◽  
...  
Keyword(s):  
Globular Cluster ◽  
White Dwarf ◽  
Luminosity Function ◽  
Main Sequence ◽  
Hubble Space Telescope ◽  
Horizontal Branch ◽  
Space Telescope

ABSTRACT We report on the white dwarf (WD) cooling sequence of the old globular cluster NGC 6752, which is chemically complex and hosts a blue horizontal branch. This is one of the last globular cluster WD cooling sequences accessible to imaging by the Hubble Space Telescope. Our photometry and completeness tests show that we have reached the peak of the luminosity function of the WD cooling sequence, at a magnitude mF606W  = 29.4 ± 0.1, which is consistent with a formal age of ∼14 Gyr. This age is also consistent with the age from fits to the main-sequence turn-off (13–14 Gyr), reinforcing our conclusion that we observe the expected accumulation of WDs along the cooling sequence.

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.

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