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The orbital and superhump periods of the dwarf nova HS 0417+7445 in Camelopardalis

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Shears, J. H. (Jeremy H.), Gänsicke, B. T. (Boris T.), Brady, S. (Steve), Dubovský, P., Miller, I. (Ian) and Staels, B.. (2011) The orbital and superhump periods of the dwarf nova HS 0417+7445 in Camelopardalis. New Astronomy, Vol.16 (No.5). pp. 311-316. ISSN 13841076

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Official URL: http://dx.doi.org/10.1016/j.newast.2010.11.002

Abstract

We present the 2005-2010 outburst history of the SU UMa-type dwarf HS 0417+7445, along with a detailed analysis of extensive time-series photometry obtained in March 2008 during the second ecorded superoutburst of the system. The mean outburst interval is 197 +/- 59 d, with a median of 193 d. The March 2008 superoutburst was preceded by a precursor outburst, had an amplitude of 4.2 magnitudes, and the whole event lasted about 16 days. No superhumps were detected during the decline from the precursor outburst, and our data suggests instead that orbital humps were present during that phase. Early superhumps detected during the rise to the superoutburst maximum exhibited an unusually large fractional period excess of is an element of = 0.137 (P(sh) = 0.0856(88) d). Following the maximum, a linear decline in brightness followed, lasting at least 6 days. During this decline, a stable superhump period of P(sh) = 0.07824(2) d was measured. Superimposed on the superhumps were orbital humps, which allowed us to accurately measure the orbital period of HS 0417+7445, P P(orb) = 0.07531(8) d, which was previously only poorly estimated. The fractional superhump period excess during the main phase of the outburst was is an element of = 0.037, which is typical for SU UMa dwarf novae with similar orbital period. Our observations are consistent with the predictions of the thermal-tidal instability model for the onset of superoutbursts, but a larger number of superoutbursts with extensive time-series photometry during the early phases of the outburst would be needed to reach a definite conclusion on the cause of superoutbursts.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Dwarf novae, Gas bursts
Journal or Publication Title:	New Astronomy
Publisher:	Elsevier Science BV
ISSN:	13841076
Date:	August 2011
Volume:	Vol.16
Number:	No.5
Page Range:	pp. 311-316
Identification Number:	10.1016/j.newast.2010.11.002
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
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URI:	http://wrap.warwick.ac.uk/id/eprint/38824