2004A&A...417.1083S


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET01:03:35

2004A&A...417.1083S - Astronomy and Astrophysics, volume 417, 1083-1092 (2004/4-3)

Asiago eclipsing binaries program. I. V432 Aurigae.

SIVIERO A., MUNARI U., SORDO R., DALLAPORTA S., MARRESE P.M., ZWITTER T. and MILONE E.F.

Abstract (from CDS):

The orbit and physical parameters of the previously unsolved eclipsing binary V432 Aur, discovered by Hipparcos, have been derived with errors better than 1% from extensive Echelle spectroscopy and B, V photometry. Synthetic spectral analysis of both components has been performed, yielding Teff and logg in close agreement with the orbital solution, a metallicity [Z/Z]=-0.6 and rotational synchronization for both components. Direct comparison on the theoretical L, Teff plane with the Padova evolutionary tracks and isochrones for the masses of the two components (1.22 and 1.08M) provides a perfect match and a 3.75 Gyr age. The more massive and cooler component is approaching the base of the giant branch and displays a probable pulsation activity with an amplitude of ΔV=0.075mag and Δrad.vel.=1.5km/s. With a Teff=6080K it falls to the red of the nearby instability strip populated by δ Sct and γ Dor types of pulsating variables. Orbital modeling reveals a large and bright surface spot on it. The pulsations activity and the large spot(s) suggest the presence of macro-turbulent motions in its atmosphere. They reflect in a line broadening that at cursory inspection could be taken as indication of a rotation faster than synchronization, something obviously odd for an old, expanding star.

Abstract Copyright:

Journal keyword(s): stars: fundamental parameters - stars: binaries: spectroscopic - stars: binaries: eclipsing - stars: oscillations - stars: individual: V432 Aur - stars: starspots

Simbad objects: 10

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Number of rows : 10

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* AB Cas Al* 02 37 31.5113123367 +71 18 16.273650984   10.59 10.32     A3 143 0
2 V* V1241 Tau Al* 03 24 23.2476767065 -00 42 14.927927423   9.87 9.49     A5III 57 1
3 V* AS Eri Al* 03 32 25.1262238528 -03 18 48.096045754   8.49 8.30     A1V 157 0
4 HD 36974 * 05 37 04.2573529629 +37 02 42.508785475   8.89 8.17     G5 10 0
5 HD 37071 TT* 05 37 32.5089179479 +37 05 12.260042335   8.59 8.05     G0 58 0
6 V* R CMa Al* 07 19 28.1782479807 -16 23 42.900652548 6.09 6.05 5.70     F2III/IV 261 0
7 V* Y Cam Al* 07 41 11.0044924697 +76 04 26.090361755   10.93 10.60     A9IV+K1IV 152 0
8 V* AI Hya Al* 08 18 47.4972775781 +00 17 00.613256146   9.77 9.35     F2m+F0V 98 0
9 * 9 Cha Al* 08 43 12.1978606956 -79 04 12.366179858   6.28 6.07     A7V 205 0
10 V* GK Dra Al* 16 45 41.1853026781 +68 15 30.858906261   9.12 8.77     G0 27 0

    Equat.    Gal    SGal    Ecl

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2019.12.14-01:03:35

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