Photometric study of new southern SU UMa-type dwarf novae and candidates - III. NSV 10934, MM Sco, AB Nor and CAL 86

Katô, Takeo; Nelson, Peter; Stockdale, Chris; Monard, B.; Richards, Tom; Stubbings, Rod; Yamaoka, H.; Heathcote, Bernard; Santallo, R.

doi:10.1111/j.1365-2966.2004.07271.x

Monthly Notices of the Royal Astronomical Society

2004

DOI: 10.1111/j.1365-2966.2004.07271.x

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Photometric study of new southern SU UMa-type dwarf novae and candidates - III. NSV 10934, MM Sco, AB Nor and CAL 86

Takeo Katô¹,

Peter Nelson²,

Chris Stockdale³

et al.

Abstract: We photometrically observed four southern dwarf novae in outburst (NSV 10934, MM Sco, AB Nor and CAL 86). NSV 10934 was confirmed to be an SU UMa-type dwarf nova with a mean superhump period of 0.07478(1) d. This star also showed transient appearance of quasiperiodic oscillations during the final growing stage of the superhumps. Combined with the recent theoretical interpretation and with the rather unusual rapid terminal fading of normal outbursts, NSV 10934 may be a candidate intermediate polar showing SU UM… Show more

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Cited by 12 publications

References 52 publications

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TV Corvi revisited: Precursor and superhump period derivative linked to the disk instability model

Uemura

Mennickent²,

Ishioka

et al. 2005

A&A

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Abstract. We report optical photometric observations of four superoutbursts of the short-period dwarf nova TV Crv. This object experiences two types of superoutbursts; one with a precursor and the other without. The superhump period and period excess of TV Crv are accurately determined to be 0.065028 ± 0.000008 d and 0.0342 ± 0.0021, respectively. This large excess implies a relatively large mass ratio of the binary components (M 2 /M 1 ), though it has a short orbital period. The two types of superoutbursts can be explained by the thermal-tidal instability model for systems having large mass ratios. Our observations reveal that superhump period derivatives are variable in distinct superoutbursts. The variation is apparently related to the presence or absence of a precursor. We propose that the superhump period derivative depends on the maximum disk radius during outbursts. We investigate the relationship of the type of superoutbursts and the superhump period derivative for known sources. In the case of superoutbursts without a precursor, superhump period derivatives tend to be larger than those in precursor-main type superoutbursts, which is consistent with our scenario.

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TV Corvi revisited: Precursor and superhump period derivative linked to the disk instability model

Uemura

Mennickent²,

Ishioka

et al. 2005

A&A

Self Cite

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A Far Ultraviolet Spectroscopic Explorer Survey of High-Declination Dwarf Novae

Godon

Sion

Barrett

et al. 2009

ApJ

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We present a spectral analysis of the Far Ultraviolet Spectroscopic Explorer (FUSE) spectra of eight high-declination dwarf novae (DNs) obtained from a Cycle 7 FUSE survey. These DN systems have not been previously studied in the UV and little is known about their white dwarfs (WDs) or accretion disks. We carry out the spectral analysis of the FUSE data using synthetic spectra generated with the codes TLUSTY and SYNSPEC. For two faint objects (AQ Men, V433 Ara) we can only assess a lower limit for the WD temperature or mass accretion rate. NSV 10934 was caught in a quiescent state and its spectrum is consistent with a low mass accretion rate disk. For 5 objects (HP Nor, DT Aps, AM Cas, FO Per and ES Dra) we obtain WD temperatures between 34,000K and 40,000K and/or mass accretion rates consistent with intermediate to outburst states. These temperatures reflect the heating of the WD due to on-going accretion and are similar to the temperatures of other DNs observed on the rise to, and in decline from outburst. The WD Temperatures we obtain should therefore be considered as upper limits, and it is likely that during quiescence AM Cas, FO Per and ES Dra are near the average WD T ef f for catalcysmic variables above the period gap (∼30,000K), similar to U Gem, SS Aur and RX And.

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AN ONLINE CATALOG OF CATACLYSMIC VARIABLE SPECTRA FROM THEFAR-ULTRAVIOLET SPECTROSCOPIC EXPLORER

Godon

Sion

Levay

et al. 2012

ApJS

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We present an online catalog containing spectra and supporting information for cataclysmic variables that have been observed with the Far Ultraviolet Spectroscopic Explorer (FUSE). For each object in the catalog we list some of the basic system parameters such as (RA,Dec), period, inclination, white dwarf mass, as well as information on the available FUSE spectra: data ID, observation date and time, and exposure time. In addition, we provide parameters needed for the analysis of the FUSE spectra such as the reddening E(B-V), distance, and state (high, low, intermediate) of the system at the time it was observed. For some of these spectra we have carried out model fits to the continuum with synthetic stellar and/or disk spectra using the codes TLUSTY and SYNSPEC. We provide the parameters obtained from these model fits; this includes the white dwarf temperature, gravity, projected rotational velocity and elemental abundances of C, Si, S and N, together with the disk mass accretion rate, the resulting inclination and model-derived distance (when unknown). For each object one or more figures are provided (as gif files) with line identification and model fit(s) when available. The FUSE spectra as well as the synthetic spectra are directly available for download as ascii tables. References are provided for each object as well as for the model fits. In this article we present 36 objects, and additional ones will be added to the online catalog in the future. In addition to cataclysmic variables, we also include a few related objects, such as a wind accreting white dwarf, a pre-cataclysmic variable and some symbiotics.

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Photometric study of new southern SU UMa-type dwarf novae and candidates - III. NSV 10934, MM Sco, AB Nor and CAL 86

Cited by 12 publications

References 52 publications

TV Corvi revisited: Precursor and superhump period derivative linked to the disk instability model

TV Corvi revisited: Precursor and superhump period derivative linked to the disk instability model

A Far Ultraviolet Spectroscopic Explorer Survey of High-Declination Dwarf Novae

AN ONLINE CATALOG OF CATACLYSMIC VARIABLE SPECTRA FROM THEFAR-ULTRAVIOLET SPECTROSCOPIC EXPLORER

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