Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-05-24
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
26 pages, 5 figures and 6 tables, accepted for publication in Publication of the Astronomical Society of Japan
Scientific paper
All available photometric and spectroscopic observations were collected and used as the basis of a detailed analysis of the close binary IM Mon. The orbital period of the binary was refined to 1.19024249(0.00000014) days. The Roche equipotentials, fractional luminosities (in (B, V) and H_p bands) and fractional radii for the component stars in addition to mass ratio q, inclination i of the orbit and the effective temperature T_eff of the secondary cooler less massive component were obtained by the analysis of light curves. IM Mon is classified to be a detached binary system in contrast to the contact configuration estimations in the literature. The absolute parameters of IM Mon were derived by the simultaneous solutions of light and radial velocity curves as M_1,2=5.50(0.24)M_o and 3.32(0.16)M_o, R1,2=3.15(0.04)R_o and 2.36(0.03)R_o, T_eff1,2=17500(350) K and 14500(550) K implying spectral types of B4 and B6.5 ZAMS stars for the primary and secondary components respectively. The modelling of the high resolution spectrum revealed the rotational velocities of the component stars as V_rot1=147(15) km/s and V_rot2=90(25) km/s. The photometric distance of 353(59) pc was found more precise and reliable than Hipparcos distance of 341(85) pc. An evolutionary age of 11.5(1.5) Myr was obtained for IM Mon. Kinematical and dynamical analysis support the membership of the young thin-disk population system IM Mon to the Ori OB1a association dynamically. Finally, we derived the distance, age and metallicity information of Ori OB1a sub-group using the information of IM Mon parameters.
Bakis Hicran
Bakis Volkan
Bilir Selcuk
Bulut Ibrahim
Demircan Osman
No associations
LandOfFree
Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of Eclipsing Binary and Multiple Systems in OB Associations: I. Ori OB1a - IM Mon will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-516847