期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

This paper presents the results of the first high-resolution spectroscopic observations of the Southern W UMa type system IS CMa. Spectroscopic observations of the system were made at Mt. John University Observatory using a HERCULES fibre-fed échelle spectrograph in September 2007. The first radial velocities of the component stars of the system were determined by using the spectral disentangling technique. The resulting orbital elements of IS CMa are:

a_{1} \sin i = 0.0041 \pm 0.0001

AU,

a_{2} \sin i = 0.0135 \pm 0.0001

AU,

M_{1} \sin^{3} i = 1.48 \pm 0.01 M_{⊙}

, and

M_{2} \sin^{3} i = 0.44 \pm 0.01 M_{⊙}

. The components were found to be in synchronous rotation taking into account the disentangled

H_{δ}

line profiles of both components of the system. The Hipparcos light curve was solved by means of the Wilson–Devinney method supplemented with a Monte Carlo type algorithm. The radial velocity curve solutions including the proximity effects give the mass ratio of the system as 0.297 ± 0.001. The combination of the Hipparcos light and radial velocity curve solutions give the following absolute parameters of the components:

M_{1} = 1.68 \pm 0.04 M_{⊙}, M_{2} = 0.50 \pm 0.02 M_{⊙}, R_{1} = 2.00 \pm 0.02 R_{⊙}, R_{2} = 1.18 \pm 0.03 R_{⊙}, L_{1} = 7.65 \pm 0.60

L_{⊙}

and

L_{2} = 1.99 \pm 0.80 L_{⊙}

. The distance to IS CMa was calculated as

87 \pm 5

pc using the distance modulus with corrections for interstellar extinction. The position of the components of IS CMa in the HR diagram are also discussed: the system seems to have an age of 1.6 Gyr. 相似文献

11.

An orbital period analysis of the dwarf novae OY Carinae

《New Astronomy》2015

相似文献

12.

Disk thickness and spiral arm structure of M31

《New Astronomy》2013

相似文献

13.

The first multi-color photometric study of the short-period contact eclipsing binary DE Lyn

《New Astronomy》2016

相似文献

14.

The optical variability properties of flat spectrum radio quasar 3C 454.3

《New Astronomy》2015

相似文献

15.

New orbital solutions and absolute elements of the eclipsing binary TV Cet

Z. Bozkurt Ö.L. Değirmenci 《New Astronomy》2010,15(4):356-361

We present new differential, four-color photoelectric photometry for the eclipsing binary TV Cet. UBVR light curves and radial velocities published previously are solved simultaneously using the Wilson–Devinney computer program. Our solutions indicate that TV Cet includes a third light contribution with 2.3% in U, 1.9% in B, 1.3% in V and 1.6% in R. The masses of the component stars are

1.34 \pm 0.05

and

1.23 \pm 0.05 M ⊙

, while the radii are

1.47 \pm 0.02

and

1.21 \pm 0.01 R ⊙

for the primary and secondary components, respectively. Using new absolute properties and our previous results from period analysis, we calculated the observational and theoretical internal structure constants to be

{\bar{k}}_{2, obs} = - 1.66

and

{\bar{k}}_{2, theo} = - 2.25

, respectively. Taking into account the third light contribution from the Wilson–Devinney solution and properties of the third body orbit from period analysis, the mass of the third body is obtained as