Hubble Space Telescope Far-UV Spectroscopy of the Short Orbital Period Recurrent Nova CI Aql: Implications for White Dwarf Mass Evolution

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.

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

International Astronomical Union Colloquium ◽

10.1017/s0252921100038781 ◽

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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A Hubble Space Telescope study of the underlying white dwarf in the dwarf nova VW Hydri during quiescence

The Astrophysical Journal ◽

10.1086/187869 ◽

1995 ◽

Vol 444 ◽

pp. L97 ◽

Cited By ~ 32

Author(s):

Edward M. Sion ◽

Paula Szkody ◽

Fu-Hua Cheng ◽

Min Huang

Keyword(s):

White Dwarf ◽

Hubble Space Telescope ◽

Space Telescope ◽

Dwarf Nova

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Modelling the Late-time Hubble Space Telescope Imaging of the Outburst of the Recurrent Nova RS Ophiuchi (2006)

Proceedings of the International Astronomical Union ◽

10.1017/s1743921312019382 ◽

2012 ◽

Vol 8 (S290) ◽

pp. 137-140

Author(s):

Valério A. R. M. Ribeiro ◽

Michael F. Bode ◽

Robert Williams

Keyword(s):

High Velocity ◽

Linear Expansion ◽

Hubble Space Telescope ◽

Archival Data ◽

Late Time ◽

Low Velocity ◽

Space Telescope ◽

Two Component ◽

Recurrent Nova ◽

Dumbbell Structure

AbstractThe nebular remnant of RS Ophiuchi was modelled using combined HST/ACS imaging and ground-based spectroscopy on day 155 after outburst as a two component bipolar expansion with a low velocity innermost hour-glass over density and a more extended high velocity dumbbell structure. The model was evolved to a much later date, day 455 after outburst, when second epoch HST images were secured. However, due to the lack of simultaneous ground-based spectroscopy the evolved model was much harder to constrain. One suggestion put forward was that the dumbbell structure expanded linearly while the inner hour-glass showed signs of deceleration. Archival data in the form of ground-based spectroscopy on day 415 were subsequently obtained. These new data suggest indeed that a non-linear expansion of the system occurred.

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