2009A&A...503..873H


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:34:33

2009A&A...503..873H - Astronomy and Astrophysics, volume 503, 873-881 (2009/9-1)

The triple system HIP 96515: a low-mass eclipsing binary with a DB white dwarf companion.

HUELAMO N., VAZ L.P.R., TORRES C.A.O., BERGERON P., MELO C.H.F., QUAST G.R., BARRADO Y NAVASCUES D., STERZIK M.F., CHAUVIN G., BOUY H. and LANDIN N.R.

Abstract (from CDS):

HIP96515A is a double-lined spectroscopic binary included in the SACY catalog as a potential young star. It has a visual companion (CCDM19371-5134B, HIP96515B) at 8.6". If bound to the primary, the optical and infrared colors of this wide companion are consistent with those of a white dwarf. We attempt to characterize the system HIP96515A&B by studying each of its components. We analyzed spectroscopic and photometric observations of HIP96515A and its visual companion, HIP96515B. To confirm the system as a common proper-motion pair, we analyzed the astrometry of the components using high-angular resolution infrared observations obtained within a time span of two years, and archival astrometry. The high-resolution optical spectrum of HIP96515A was used to derive a mass ratio, M2/M1, close to 0.9. The optical lightcurve of HIP96515A shows periodic variations with Porbital=2.3456days, revealing that HIP96515A is an eclipsing binary with preliminary orbital parameters of i=89.0deg±0.2deg, and M1=0.59±0.03M and M2=0.54±0.03M, for the primary and secondary, respectively, at an estimated distance of 42±3pc. This is a new eclipsing binary with component masses below 0.6M. Multi-epoch observations of HIP96515 A&B show that the system is a common proper-motion pair. The optical spectrum of HIP96515B is consistent with a pure helium atmosphere (DB) white dwarf. The comparison with evolutionary cooling sequence models provides Teff,WD=19126±195K, loggWD=8.08, MWD/M=0.6, and a distance of ∼46pc. The estimated WD cooling age is ∼100Myr and the total age of the object (including the main-sequence phase) is ∼400Myr. Finally, if HIP96515 A&B are coeval, and assuming a common age of ∼400Myr, the comparison of the masses of the eclipsing binary members with evolutionary tracks shows that they are underestimated by ∼15% and 10%, for the primary and secondary, respectively.

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: binaries: eclipsing - stars: individual: HIP96515

Simbad objects: 4

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Number of rows : 4

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 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1272 1
2 V* CV Boo Al* 15 26 19.5364840761 +36 58 53.435044933   11.61 10.99     G3V 70 0
3 UCAC2 9614745 WD? 19 37 08.1453758176 -51 34 07.065552270       14.59   ~ 2 0
4 Smethells 41 Al* 19 37 08.7868773751 -51 34 00.886230752   13.84 11.56 11.348 9.891 M1Ve 21 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:34:33

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