# Siam Physics Congress 2015

20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

## Study and analysis of the new eclipsing PCEB system: SDSS J074548.63+263123.4

20 May 2015, 14:00
3h 30m
Board: AST-05
Poster presentation Astronomy, Astrophysics, and Cosmology

### Speaker

Mr Niwat Hemha (School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

### Description

The common-envelope process is known as one of the complicated phases in binary evolution. A lot of efforts have been dedicated to study this common-envelope stage, but the many questions related to this process are yet to be answered. If one binary survives the common-envelope, the binary will emerge as a white dwarf accompanied by low-mass main sequence star in close orbit, or often referred as the post common-envelope binary (PCEB). SDSS J074548.63+263123.4 is one of the newly found PCEBs from the Sloan Digital Sky Survey (SDSS). In this work, we aim to confirm the eclipsing nature of J074548.63+263123.4 and to determine the stellar and orbital parameters. The primary eclipse in the light curve of SDSS J0745+2631 from our follow-up observation using the ULTRASPEC instrument from the Thai National Observatory. The data in $g^{\prime}$ filter showed an evidence of the primary eclipse. In the end of 2014, J074548.63+263123.4 was observed on several filters ($r^{\prime}$, $g^{\prime}$ and $KG5^{\prime}$ filters). Those observations shown primary eclipse and SDSS J0745+2631 is confirmed to be an eclipsing binaries system.

### Primary author

Mr Niwat Hemha (School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand)

### Co-authors

Dr Nuanwan Sanguansak (School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand) Dr Puji Irawati (National Astronomical Research Institute of Thailand,Chiang Mai 50200, Thailand) Prof. Tom Marsh (Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom) Prof. Vik Dhillon (Department of Physics and Astronomy, University of Sheffield , Sheffield S3 7RH, UK)

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