2011A&A...526A.150R


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.13CET11:54:50

2011A&A...526A.150R - Astronomy and Astrophysics, volume 526A, 150-150 (2011/2-1)

Near-infrared SOAR photometric observations of post common envelope binaries.

RIBEIRO T. and BAPTISTA R.

Abstract (from CDS):

From a number of known post common envelopes binaries (PCEB) only a handful have yet been observed at near-infrared (NIR) wavelengths, and even fewer have modeled NIR light curves. At shorter wavelengths one has access to the cooler and larger components of these systems and has a chance to detect emission from its faint and heavily irradiated atmospheres. By modeling NIR light curves of PCEBs, we intend to constrain their system parameters and study the properties of the system components. Here we present simultaneous NIR JHKs light curves of two PCEBs obtained with the 4m SOAR telescope. KV Vel and TW Crv are long-period (Porb=8.6h and 7.9h, respectively) PCEBs with strong irradiation effects. The results of light-curve fitting provided solutions with inclination i=(47±5)°, mass ratio q=0.3±0.1, and radius of the secondary R2/a=0.24+0.05–0.03 (where a is the orbital separation) for KV Vel, and i=(42±9)°, q=0.28±0.04, and R2/a=0.22±0.01 for TW Crv, respectively. For KV Vel, we obtain an average value for the albedo of the secondary star of α=0.43, consistent in the J, H and Ks band. For TW Crv, on the other hand, we obtain values of αJ=(0.4±0.1) for the J and αH=(0.3±0.1) for H-band.

Abstract Copyright:

Journal keyword(s): binaries: close - stars: fundamental parameters - ephemerides - binaries: spectroscopic - subdwarfs

VizieR on-line data: <Available at CDS (J/A+A/526/A150): photom.dat>

Simbad objects: 3

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Number of rows : 3

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 CD-48 6027 HS* 10 54 40.5600843998 -48 47 02.815812625 10.92 11.99 12.12 12.39   sdO 102 0
2 V* TW Crv HS* 12 00 05.6457009978 -19 02 03.968468680   12.59 13.18     sdO+dMe 30 0
3 V* IP Peg DN* 23 23 08.5362716048 +18 24 59.206210572           M2 353 0

    Equat.    Gal    SGal    Ecl

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2019.11.13-11:54:50

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