2001A&A...374..204D


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.31CET16:59:09

2001A&A...374..204D - Astronomy and Astrophysics, volume 374, 204-212 (2001/7-4)

Eclipsing binaries with candidate CP stars. II. Parameters of the system V392 Carinae.

DEBERNARDI Y. and NORTH P.

Abstract (from CDS):

We present a detailed study of an eclipsing binary which had been classified Ap SrCrEu (Hartoog, 1976) 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, vsin i1=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.

Abstract Copyright:

Journal keyword(s): stars: peculiar - stars: eclipsing binaries - stars: spectroscopic binaries

VizieR on-line data: <Available at CDS (J/A+A/374/204): table1.dat>

CDS comments: Authors used the designation 'Cox NNN' for the list of WEBDA database. Cox NNN = NGC 2516 NNN for (Nos 1-112). Cox 127 = Cl* NGC 2516 DAC 34, Cox 230 = Cl* NGC 2516 DAC 103.

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* V607 Car a2* 07 56 22.6799840843 -61 17 02.133843497   9.365 9.340     ApSi 31 0
2 CD-60 1940 * 07 57 34.5659804609 -60 59 35.020892408   10.454 10.260   10.037 ~ 14 0
3 V* V391 Car a2* 07 58 02.5003017992 -60 48 46.809502918   8.89 8.96     A0pEuCrSr 55 0
4 V* V356 Car Al* 07 58 02.9122272935 -60 36 53.227575079 7.22 7.55 7.59     B9.5IVpSi 80 0
5 NGC 2516 OpC 07 58 04 -60 45.2           ~ 595 0
6 V* V392 Car Al* 07 58 10.4768160715 -60 51 57.409026358   9.69 9.48     A2Vp:Sr:Cr:Eu: 65 0
7 CD-60 1967 V* 07 58 12.8817121589 -60 48 04.807346740 7.2 7.27 7.22     B9.5IV 35 0
8 V* V422 Car a2* 07 59 21.2950129087 -60 48 56.379239270   9.13 9.08     B8/9pSi 65 0
9 HD 66318 * 07 59 27.4746869367 -60 47 47.109578701   9.69 9.56   9.555 A0pEuCrSr 84 0
10 V* V342 Car Mi* 08 28 54.2046386413 -59 47 45.826373498   14.74 13.40 14.73   Me 6 0

    Equat.    Gal    SGal    Ecl

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2020.10.31-16:59:09

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