The 'outside-in' outburst of HT Cassiopeiae

Zach Ioannou; T. Naylor; W. F. Welsh; M. S. Catalán; W. J. Worraker; N. D. James

doi:10.1046/j.1365-8711.1999.03001.x

The 'outside-in' outburst of HT Cassiopeiae

Zach Ioannou^*, T. Naylor, W. F. Welsh, M. S. Catalán, W. J. Worraker, N. D. James

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

We present results from photometric observations of the dwarf nova system HT Cas during the eruption of 1995 November. The data include the first two-colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady-state models, but the inclusion of an inner-disc truncation radius of about 4R_wd and a 'flared' disc of semi-opening angle of 10° produces acceptable fits. The disc is found to have expanded at the start of the outburst to about 0.41R_L1, as compared with quiescent measurements. The accretion disc then gradually decreases in radius reaching <0.32R_L1 during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.

Original language	English
Pages (from-to)	398-406
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	310
Issue number	2
DOIs	https://doi.org/10.1046/j.1365-8711.1999.03001.x
Publication status	Published - Dec 1 1999
Externally published	Yes

Keywords

Accretion, accretion discs
Binaries: close
Binaries: eclipsing
Novae, cataclysmic variables
Stars: individual: HT Cas

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.1999.03001.x

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title = "The 'outside-in' outburst of HT Cassiopeiae",

abstract = "We present results from photometric observations of the dwarf nova system HT Cas during the eruption of 1995 November. The data include the first two-colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady-state models, but the inclusion of an inner-disc truncation radius of about 4Rwd and a 'flared' disc of semi-opening angle of 10° produces acceptable fits. The disc is found to have expanded at the start of the outburst to about 0.41RL1, as compared with quiescent measurements. The accretion disc then gradually decreases in radius reaching <0.32RL1 during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.",

keywords = "Accretion, accretion discs, Binaries: close, Binaries: eclipsing, Novae, cataclysmic variables, Stars: individual: HT Cas",

author = "Zach Ioannou and T. Naylor and Welsh, {W. F.} and Catal{\'a}n, {M. S.} and Worraker, {W. J.} and James, {N. D.}",

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T1 - The 'outside-in' outburst of HT Cassiopeiae

AU - Ioannou, Zach

AU - Naylor, T.

AU - Welsh, W. F.

AU - Catalán, M. S.

AU - Worraker, W. J.

AU - James, N. D.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - We present results from photometric observations of the dwarf nova system HT Cas during the eruption of 1995 November. The data include the first two-colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady-state models, but the inclusion of an inner-disc truncation radius of about 4Rwd and a 'flared' disc of semi-opening angle of 10° produces acceptable fits. The disc is found to have expanded at the start of the outburst to about 0.41RL1, as compared with quiescent measurements. The accretion disc then gradually decreases in radius reaching <0.32RL1 during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.

AB - We present results from photometric observations of the dwarf nova system HT Cas during the eruption of 1995 November. The data include the first two-colour observations of an eclipse on the rise to outburst. They show that during the rise to outburst the disc deviates significantly from steady-state models, but the inclusion of an inner-disc truncation radius of about 4Rwd and a 'flared' disc of semi-opening angle of 10° produces acceptable fits. The disc is found to have expanded at the start of the outburst to about 0.41RL1, as compared with quiescent measurements. The accretion disc then gradually decreases in radius reaching <0.32RL1 during the last stages of the eruption. Quiescent eclipses were also observed prior to and after the eruption and a revised ephemeris is calculated.

KW - Accretion, accretion discs

KW - Binaries: close

KW - Binaries: eclipsing

KW - Novae, cataclysmic variables

KW - Stars: individual: HT Cas

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JF - Monthly Notices of the Royal Astronomical Society

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ER -

The 'outside-in' outburst of HT Cassiopeiae

Abstract

Keywords

ASJC Scopus subject areas

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