2007A&A...466.1031V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.05CEST04:58:27

2007A&A...466.1031V - Astronomy and Astrophysics, volume 466, 1031-1041 (2007/5-2)

DE Canum Venaticorum: a bright, eclipsing red dwarf-white dwarf binary.

VAN DEN BESSELAAR E.J.M., GREIMEL R., MORALES-RUEDA L., NELEMANS G., THORSTENSEN J.R., MARSH T.R., DHILLON V.S., ROBB R.M., BALAM D.D., GUENTHER E.W., KEMP J., AUGUSTEIJN T. and GROOT P.J.

Abstract (from CDS):

Close white dwarf-red dwarf binaries must have gone through a common-envelope phase during their evolution. DE CVn is a detached white dwarf-red dwarf binary with a relatively short (∼8.7h) orbital period. Its brightness and the presence of eclipses makes this system ideal for a more detailed study. From a study of photometric and spectroscopic observations of DE CVn we derive the system parameters that we discuss in the framework of common-envelope evolution. Photometric observations of the eclipses are used to determine an accurate ephemeris. From a model fit to an average low-resolution spectrum of DE CVn, we constrain the temperature of the white dwarf and the spectral type of the red dwarf. The eclipse light curve is analysed and combined with the radial velocity curve of the red dwarf determined from time-resolved spectroscopy to derive constraints on the inclination and the masses of the components in the system. The derived ephemeris is HJDmin=2452784.5533(1)+0.3641394(2)xE. The red dwarf in DE CVn has a spectral type of M3V and the white dwarf has an effective temperature of 8000K. The inclination of the system is 86+3o–2 and the mass and radius of the red dwarf are 0.41±0.06M and 0.37+0.06–0.007R, respectively, and the mass and radius of the white dwarf are 0.51+0.06–0.02M and 0.0136+0.0008–0.0002R, respectively. We found that the white dwarf has a hydrogen-rich atmosphere (DA-type). Given that DE CVn has experienced a common-envelope phase, we can reconstruct its evolution and we find that the progenitor of the white dwarf was a relatively low-mass star (M≤1.6M). The current age of this system is 3.3-7.3x109-years, while it will take longer than the Hubble time for DE CVn to evolve into a semi-detached system.

Abstract Copyright:

Journal keyword(s): stars: individual: DE CVn - stars: binaries: eclipsing - stars: binaries: close - stars: late-type - stars: white dwarfs - stars: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/466/1031): uvic_r.dat uvic_v.dat uvic_cle.dat dao_b.dat mdm_b.dat mdm_bg38.dat ultrac_g.dat ultrac_i.dat ultrac_u.dat>

Simbad objects: 6

goto Full paper

goto View the reference in ADS

Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* RR Cae WD* 04 21 05.5631969817 -48 39 07.062891386 14.50 14.92 14.40     DA7.8 134 1
2 V* DE CVn WD* 13 26 53.2714916743 +45 32 46.687036035   14.23 12.96 12.59   DA+M3V 39 0
3 V* QS Vir WD* 13 49 52.0031855330 -13 13 37.001934702 14.27 14.98 14.40 14.37   DA3+dM 122 1
4 V* GK Vir WD* 14 15 36.4126864388 +01 17 18.227940327   17.0       DAe+M 93 0
5 V* NN Ser No* 15 52 56.1202658103 +12 54 44.432043501     16.51     DAO1+M4 232 0
6 RX J2130.6+4710 XB* 21 30 18.4670095810 +47 10 07.402855249           DA+M3.5/4Ve 31 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2007A&A...466.1031V and select 'bookmark this link' or equivalent in the popup menu


2020.07.05-04:58:27

© Université de Strasbourg/CNRS

    • Contact