J/A+A/374/204 V392 Car light curve (Debernardi+, 2001)
Eclipsing binaries with candidate CP stars. II.
Parameters of the system V392 Carinae.
Debernardi Y., North P.
<Astron. Astrophys. 374, 204 (2001)>
=2001A&A...374..204D 2001A&A...374..204D
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ; Photometry, Geneva
Keywords: stars: peculiar - stars: eclipsing binaries -
stars: spectroscopic binaries
Abstract:
We present a detailed study of an eclipsing binary which had been
classified Ap SrCrEu (Hartoog, 1976ApJ...205..807H 1976ApJ...205..807H) before being known
as a binary. Radial velocities measured at the times of both
quadratures allow us to obtain precise masses for both components,
while the light curve yields the radii. The following ephemeris and
fundamental parameters of the system were obtained:
HJD=(2447999.7656±0.0041) +(3.174990±0.000001) E, e=0.00,
i=81.9±0.1°, M1=1.90±0.02M☉, M2=1.85±0.02M☉,
R1=1.63±0.03R☉, R2=1.60±0.03R☉,
vsini1=27.6±3.5km/s, vsini2=23.6±3.6km/s. The projected
rotational velocities were determined by fitting a synthetic spectrum
convolved with a rotational profile to the observed spectrum. A
comparison of the spectra of V392 Car and of the normal A star Cox 98,
which has the same colour indices, shows that Sr is not overabundant
and the metallicity of V392 Car is the same as that of the other
cluster members. Therefore, V392 Car is a normal A2 star rather than
an Ap star. The position of V392 Car in the HR diagram is entirely
consistent with membership of the cluster NGC 2516. An independent
estimate of the distance to this cluster was done using the parameters
of the eclipsing system, and found to be in agreement with the
Hipparcos one. A comparison of the parameters obtained from
observations with predictions of internal structure models leads to a
metallicity estimate [M/H]=0±0.10dex for NGC 2516. This estimate is
completely independent of any spectroscopic or photometric method
(except for the Teff determination) but relies on stellar structure
models.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
07 58 12 -60 52.0 V392 Car
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 26 734 Photometric data of Cox 38 (V392 Car)
--------------------------------------------------------------------------------
See also:
J/A+A/324/137 : Eclipsing binaries with candidate CP stars. I. (North+ 1997)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 F11.3 d HJD Heliocentric Julian Date
16- 20 F5.3 mag Vmag Apparent visible magnitude in the Geneva system.
26 I1 -- Q Photometric Q weight (Rufener, 1988, Cat. II/169)
--------------------------------------------------------------------------------
References:
Rufener F., 1988, "Catalogue of stars measured in the Geneva Observatory
Photometric system", 4th Edition, Geneva Observatory, Catalogue II/169
(End) Patricia Bauer [CDS] 18-Jun-2001