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|Title:||Method of LSD profile asymmetry for estimating the center of mass velocities of pulsating stars||Authors:||Britavskiy, N.
|Issue Date:||2016||Volume:||RRL2015: High-Precision Studies of RR Lyrae Stars||Editors:||Szabados, L.; Szabó, R.; Kinemuchi, K.||Series:||COMMUNICATIONS FROM THE KONKOLY OBSERVATORY OF THE HUNGARIAN ACADEMY OF SCIENCES||Number:||105||First Page:||105||Abstract:||We present radial velocity analysis for 20 solar neighborhood RR Lyrae and 3 Population II Cepheids. High-resolution spectra were observed with either TNG/SARG or VLT/UVES over varying phases. To estimate the center of mass (barycentric) velocities of the program stars, we utilized two independent methods. First, the 'classic' method was employed, which is based on RR Lyrae radial velocity curve templates. Second, we provide the new method that used absorption line profile asymmetry to determine both the pulsation and the barycentric velocities even with a low number of high-resolution spectra and in cases where the phase of the observations is uncertain. This new method is based on a least squares deconvolution (LSD) of the line profiles in order to an- alyze line asymmetry that occurs in the spectra of pulsating stars. By applying this method to our sample stars we attain accurate measurements (+- 2 kms^-1) of the pulsation component of the radial velocity. This results in determination of the barycentric velocity to within 5 kms^-1 even with a low number of high- resolution spectra. A detailed investigation of LSD profile asymmetry shows the variable nature of the project factor at different pulsation phases, which should be taken into account in the detailed spectroscopic analysis of pulsating stars.||Conference Name:||RRL2015: High-Precision Studies of RR Lyrae Stars||Conference Place:||Visegràd (Ungheria)||Conference Date:||19-22 Ottobre, 2015||URI:||http://hdl.handle.net/20.500.12386/24745||URL:||https://www.konkoly.hu/Mitteilungen/105.html||ISSN:||0238-2091||Bibcode ADS:||2016CoKon.105..105B||Fulltext:||open|
|Appears in Collections:||3.01 Contributi in Atti di convegno|
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