2009A&A...496..805R


Query : 2009A&A...496..805R

2009A&A...496..805R - Astronomy and Astrophysics, volume 496, 805-812 (2009/3-4)

An evolved donor star in the long-period cataclysmic variable HS0218+3229.

RODRIGUEZ-GIL P., TORRES M.A.P., GAENSICKE B.T., MUNOZ-DARIAS T., STEEGHS D., SCHWARZ R., RAU A. and HAGEN H.-J.

Abstract (from CDS):

We present time-resolved spectroscopy and photometry of HS0218+3229, a new long-period cataclysmic variable discovered within the Hamburg Quasar Survey. It is one of the few systems that allow a dynamical measurement of the masses of the stellar components. We combine the analysis of time-resolved optical spectroscopy and R-band photometry with the aim of measuring the mass of the white dwarf and the donor star and the orbital inclination. Cross-correlation of the spectra with K-type dwarf templates is used to derive the radial velocity curve of the donor star. An optimal subtraction of the broadened templates is performed to measure the rotational broadening and constrain the spectral type of the donor. Finally, an ellipsoidal model is fitted to the R-band light curve to obtain constraints upon the orbital inclination of the binary system. The orbital period of HS0218+3229 is found to be 0.297229661±0.000000001d (7.13351186±0.00000002h), and the amplitude of the donor's radial velocity curve is K2=162.4±1.4km/s. Modelling the ellipsoidal light curves gives an orbital inclination in the range i=59°±3°. A rotational broadening between 82.4±1.2km/s and 89.4±1.3km/s is found when assuming zero and continuum limb darkening, respectively. The secondary star has most likely a spectral type K5 and contributes ∼80-85% to the R-band light. Our analysis yields a mass ratio of 0.52<q<0.65, a white dwarf mass of 0.44<M1(M)<0.65, and a donor star mass of 0.23<M2(M)<0.44. We find that the donor star in HS0218+3229 is significantly undermassive for its spectral type. It is therefore very likely that it has undergone nuclear evolution prior to the onset of mass transfer.

Abstract Copyright:

Journal keyword(s): accretion, accretion discs - stars: binaries: close - stars: novae, cataclysmic variables

CDS comments: Fig.1 star C1 is 2MASS J02212369+3241290 in Simbad.

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 - 2024
#notes
1 HD 5351 PM* 00 57 04.4100969645 +69 02 36.436427782   10.13   8.5   K4V 83 0
2 HD 6660 PM* 01 07 37.8742786493 +22 57 17.925623641 10.617 9.58 9.15 8.75 7.142 K4V 117 0
3 * 107 Psc PM* 01 42 29.7625251280 +20 16 06.645657710 6.57 6.08 5.24 4.55 4.12 K1V 551 0
4 HD 10436 PM* 01 43 40.7239658880 +63 49 24.235143093   9.609 8.407 7.7   K5Vbe 116 0
5 HD 10780 BY* 01 47 44.8344358038 +63 51 09.011001993 6.84 6.44 5.63 4.99 4.60 K0V 347 0
6 UCAC2 43218358 * 02 21 23.6894592888 +32 41 28.951920780           ~ 1 0
7 HS 0218+3229 CV* 02 21 33.4824194472 +32 43 23.886726456           ?+K5e 24 0
8 HD 16160 PM* 02 36 04.9013368983 +06 53 12.383654295   6.81   5.2   K3V 543 0
9 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1084 0
10 V* MU Cam XB* 06 25 16.2519466536 +73 34 39.105603804       14.3   ~ 69 0
11 V* GY Cnc CV* 09 09 50.5407550968 +18 49 47.429496300           ~ 79 0
12 RX J0944.5+0357 CV* 09 44 31.6813494432 +03 58 05.300563116   17.525 17.019 15.574   M2V 36 0
13 V* HY Leo XB* 09 46 34.4706027984 +13 50 57.845238504           sdA 23 0
14 V* AP CrB CV* 15 54 12.3454476576 +27 21 52.290975024     16.87 16.5   M3 44 0
15 HS 1857+5144 CV* 18 58 32.0885126712 +51 48 57.517565256   15.7   16.3   M5 21 0

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