Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira
| العنوان: | Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira |
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| المؤلفون: | Somnath Dutta, N. M. Ashok, Ramkrishna Das, Supriyo Ghosh, Franz-Josef Hambsch, Debjyoti Banerjee, Soumen Mondal |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics, Mira variable, 010504 meteorology & atmospheric sciences, Phase (waves), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Effective temperature, 01 natural sciences, Astrophysics - Astrophysics of Galaxies, Characterization (materials science), Luminosity, Amplitude, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Oxygen rich, Transient (oscillation), 010303 astronomy & astrophysics, Solar and Stellar Astrophysics (astro-ph.SR), 0105 earth and related environmental sciences |
| الوصف: | We describe the time-dependent properties of a new spectroscopically confirmed Mira variable, which was discovered in 2013 as MASTER-Net Optical Transient (OT) J212444.87+321738.3 towards the Cygnus constellation. We have performed long-term optical/near-infrared (NIR) photometric and spectroscopic observations to characterize the object. From the optical/NIR light curves, we estimate a variability period of 465 $\pm$ 30 days. The wavelength-dependent amplitudes of the observed light-curves range from $\Delta$I$\sim$4 mag to $\Delta$K$\sim$1.5 mag. The (J-K) color-index varies from 1.78 to 2.62 mag over phases. Interestingly, a phase lag of $\sim$60 days between optical and NIR light curves is also seen, as in other Miras. Our optical/NIR spectra show molecular features of TiO, VO, CO, and strong water bands which are a typical signature of oxygen-rich Mira. We rule out S- or C-type as ZrO bands at 1.03 and 1.06 $\mu$m and $C_2$ band at 1.77 $\mu$m are absent. We estimate the effective temperature of the object from the SED, and distance and luminosity from standard Period-Luminosity relations. The optical/NIR spectra display time-dependent atomic and molecular features (e.g. TiO, NaI, CaI, H$_2$O,CO), as commonly observed in Miras. Such spectroscopic observations are useful for studying pulsation variability in Miras. Comment: 17 pages, 6 figures, accepted for publication in The Astronomical Journal |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9ebb2b76dca3252cec053a13d0d3e2c http://arxiv.org/abs/1804.07515 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....d9ebb2b76dca3252cec053a13d0d3e2c |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |