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J/A+A/524/A86     Light curves of SDSS J003941.06+005427.5   (Southworth+, 2010)
Orbital periods of cataclysmic variables identified by the SDSS.
VIII. A slingshot prominence in SDSS J003941.06+005427.5?
    Southworth J., Marsh T.R., Gansicke B.T., Steeghs D., Copperwheat C.M.
   <Astron. Astrophys. 524, A86 (2010)>
   =2010A&A...524A..86S
ADC_Keywords: Binaries, cataclysmic ; Photometry, CCD ; Spectroscopy

Keywords: stars: dwarf novae - binaries: spectroscopic -
          novae, cataclysmic variables

Abstract:
    We present VLT spectroscopy and NTT photometry of the faint
    cataclysmic binary SDSS J003941.06+005427.5. This object shows
    triple-peaked Hα emission with all three peaks variable in both
    strength and velocity. We measure an orbital period of
    91.395±0.093min from the velocity variations of the wings of the
    Halpha emission line. Using the GALEX and SDSS photometry of this
    object, we determine a white dwarf temperature of 15000K and a very
    late (≥L2) spectral type for the companion star. These measurements,
    plus the relatively long orbital period, suggest that SDSS
    J003941.06+005427.5 may be a post-bounce cataclysmic variable. Doppler
    maps of the Hα and HeI 6678Å emission features show an
    accretion disc with a non-uniform brightness and departures from
    Keplerian flow. The third emission peak is detected only in Hα
    and at a relatively low velocity amplitude of 202±3km/s. We are
    unable to explain this emission as arising from either the white
    dwarf, the secondary star, or the accretion disc. We tentatively
    attribute this mysterious central peak to a coronal loop anchored at
    the secondary star. If confirmed, this would be the first example of a
    slingshot prominence in a CV with a low mass-transfer rate and/or a
    fully convective secondary star.

Description:
    Long-slit spectroscopy (29 spectra obtained over two nights) and
    differential photometry (167 datapoints obtained over two nights) are
    presented for the cataclysmic variable SDSS J003941.06+005427.5.
Objects:
  ----------------------------------------------------------------------------
     RA   (2000)   DE      Designation(s)
  ----------------------------------------------------------------------------
  00 39 41.1   +00 54 28   SDSS J003941.06+005427.5 = SDSS J003941.06+005427.5
  ----------------------------------------------------------------------------

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
lc.dat            28      166   Photometry of SDSS J003941.06+005427.5
obs.dat           33       29   Spectroscopic observations
sp/*               0       29   FITS files with spectra


See also:
 J/MNRAS/373/687 : Spectra of 5 cataclysmic variables (Southworth+, 2006)
 J/A+A/507/929   : Light curves of SDSS J100658.40+233724.4 (Southworth+, 2009)
 J/A+A/510/A100  : Four new SDSS eclipsing systems (Southworth+, 2010)


Byte-by-byte Description of file: lc.dat

   Bytes Format Units   Label     Explanations

   1- 13  F13.5 d       HJD       Heliocentric Julian Date (UTC timescale) of
                                   the exposure midpoint
  16- 21  F6.3  mag     mag       Apparent magnitude of SDSS J003941.06+005427.5
  24- 28  F5.3  mag     e_mag     Measurement error in the apparent magnitude


Byte-by-byte Description of file: obs.dat

   Bytes Format Units   Label     Explanations

   1- 17  F17.9 d       HJD       Heliocentric Julian Date of observation
  19- 33  A15   ---     FileName  Name of the fits file in sp subdirectory


Acknowledgements:
    John Southworth, jkt(at)astro.keele.ac.uk

References:
    Southworth et al., Paper I     2007MNRAS.378..635S
    Southworth et al., Paper II    2007MNRAS.382.1145S
    Dillon et al.,     Paper III   2008MNRAS.386.1568D
    Southworth et al., Paper IV    2008MNRAS.388..709S
    Southworth et al., Paper V     2008MNRAS.391..591S
    Southworth et al., Paper VI    2009A&A...507..929S, Cat. J/A+A/507/929
    Southworth et al., Paper VII   2010A&A...510A.100S, Cat. J/A+A/510/A100
(End)                                        Patricia Vannier [CDS]  28-Sep-2010