2005A&A...430..629A


Query : 2005A&A...430..629A

2005A&A...430..629A - Astronomy and Astrophysics, volume 430, 629-642 (2005/2-1)

HS 2331+3905: The cataclysmic variable that has it all.

ARAUJO-BETANCOR S., GAENSICKE B.T., HAGEN H.-J., MARSH T.R., HARLAFTIS E.T., THORSTENSEN J., FRIED R.E., SCHMEER P. and ENGELS D.

Abstract (from CDS):

We report detailed follow-up observations of the cataclysmic variable HS 2331+3905, identified as an emission-line object in the Hamburg Quasar Survey. An orbital period of 81.08min is unambiguously determined from the detection of eclipses in the light curves of HS 2331+3905. A second photometric period is consistently detected at P≃83.38min, ∼2.8% longer than Porb, which we tentatively relate to the presence of permanent superhumps. High time resolution photometry exhibits short-timescale variability on time scales of ≃5-6 min which we interpret as non-radial white dwarf pulsations, as well as a coherent signal at 1.12min, which is likely to be the white dwarf spin period. A large-amplitude quasi-sinusoidal radial velocity modulation of the Balmer and Helium lines with a period ∼3.5h is persistently detected throughout three seasons of time-resolved spectroscopy. However, this spectroscopic period, which is in no way related to the orbital period, is not strictly coherent but drifts in period and/or phase on time scales of a few days. Modeling the far-ultraviolet to infrared spectral energy distribution of HS 2331+3905, we determine a white dwarf temperature of Teff≃10500K (assuming Mwd=0.6M), close to the ZZ Ceti instability strip of single white dwarfs. The spectral model implies a distance of d=90±15pc, and a low value for the distance is supported by the large proper motion of the system, µ=0.14"/yr. The non-detection of molecular bands and the low J, H, and K fluxes of HS 2331+3905 make this object a very likely candidate for a brown-dwarf donor.

Abstract Copyright:

Journal keyword(s): stars: binaries: close - stars: individual: HS 2331+3905 - stars: novae, cataclysmic variables

CDS comments: Aqr1 = [DWS97] Aqr 1.

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 440 0
2 V* ZZ Cet WD* 01 36 13.6153974672 -11 20 32.632874601   14.328 14.16 14.4   DA4.0 275 0
3 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 425 0
4 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1058 0
5 V* FS Aur CV* 05 47 48.3599178816 +28 35 11.207992848           ~ 105 0
6 V* SU UMa CV* 08 12 28.2695986944 +62 36 22.427676396           B2 490 0
7 V* EG Cnc CV* 08 43 03.9863206560 +27 51 49.693595508           DAe 174 0
8 TYC 4865-384-1 * 08 53 35.4735033024 -00 36 41.156134632 12.291 12.296 11.797 11.771 11.211 F8 30 0
9 V* GW Lib No* 15 19 55.3333785336 -25 00 24.614534520           ~ 199 0
10 V* PY Vul WD* 19 37 13.7502269447 +27 43 18.733503670   13.14   12.7   DA4.0 124 0
11 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20     DAepv 929 0
12 V* V349 Aqr CV* 22 38 43.8299592768 +01 08 20.710907664           ~ 21 0
13 V* V455 And CV* 23 34 01.4484962496 +39 21 40.866079356   16.22 16.09 16.14   ~ 133 0
14 USNO-A2.0 1275-18486676 * 23 34 04.1633402808 +39 22 42.480094620   15.3 14.9     ~ 1 0
15 GSC 03231-00595 PM* 23 34 04.1889257160 +39 21 24.193415880   13.70 12.70 12.38   ~ 2 0

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2023.02.02-18:50:03

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