SIMBAD references

2016AJ....151..124Y - Astron. J., 151, 124-124 (2016/May-0)

Near-contact binaries IZ Monocerotis and AR Draconis.

YANG Y.-G., DAI H.-F., ZHOU Z. and LI Q.

Abstract (from CDS):

We present multi-color photometric observations for two neglected near-contact binaries, IZ Mon ( P=0__AMP__fd;77980 ) and AR Dra ( P=0__AMP__fd;67584 ). By the aid of the updated W-D analysis code, the photometric solutions were deduced from the multi-color light curves (LCs). IZ Mon is a semi-detached binary with a mass ratio of q=0.388(±0.002) , while AR Dra is a detached star with a mass ratio of q=0.652(±0.002) . The asymmetric LCs of IZ Mon were modeled by a hot spot on the secondary's surface, which may be attributed to mass transfer from the primary. Based on all collected eclipse times for two systems, we constructed their timing residual curves. The orbital period for IZ Mon may be continuously decreasing at a rate of {dP}/{dt}=-2.06(±0.04) days yr^{-1} , which may result from mass and angular momentum loss from the central system. For AR Dra, there exists a cyclic variation with a period of ¶_{3}=104.9(±2.9) yr due to light-time orbit effect via the presence of the third body, whose mass is more than 0.28(±0.02) {M}_☉ . Finally, two near-contact binaries, IZ Mon and AR Dra, will evolve into contact binaries.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: close - binaries: eclipsing - stars: individual: (AR Dra, IZ Mon)

VizieR on-line data: <Available at CDS (J/AJ/151/124): table1.dat table2.dat table3.dat table4.dat table6.dat refs.dat>

CDS comments: misprints: the IZ Mon's coordinates are 07 00 44.845 +08 49 03.06 (not 06 58 01.05 +08 53 20.1), read AN 239.1943 instead of AN 239.1964.

Simbad objects: 11

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