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J/A+A/607/A60         BD+46 442 optical spectra                  (Bollen+, 2017)

Jet creation in post-AGB binaries: the circum-companion accretion disc around BD+46 442. Bollen D., Van Winckel H., Kamath D. <Astron. Astrophys. 607, A60 (2017)> =2017A&A...607A..60B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Line Profiles ; Spectroscopy Keywords: stars: individual: BD+46 442 - stars: AGB and post-AGB - stars: binaries: spectroscopic - ISM: jets and outflows - circumstellar matter - accretion, accretion disks Abstract: We aim at describing and understanding binary interaction processes in systems with very evolved companions. Here, we focus on understanding the origin and determining the properties of the high-velocity outflow observed in one such system. We present a quantitative analysis of BD+46 442, a post-AGB binary which shows active mass transfer that leads to the creation of a disk-driven outflow or jet. We obtained high-resolution optical spectra from the HERMES spectrograph, mounted on the 1.2m Flemish Mercator Telescope. By performing a time-series analysis of the Hα profile, we dissected the different components of the system. We deduced the jet geometry by comparing the orbital phased data with our jet model. In order to image the accretion disk around the companion of BD+46 442, we applied the technique of Doppler tomography. Results: The orbital phase-dependent variations in the Hα profile can be related to an accretion disk around the companion, from which a high-velocity outflow or jet is launched. Our model shows that there is a clear correlation between the inclination angle and the jet opening angle. The latitudinally dependent velocity structure of our jet model shows a good correspondence to the data, with outflow velocities at least higher than 400km/s. The intensity peak in the Doppler map might be partly caused by a hot spot in the disk, or a larger asymmetrical structure in the disk. We show that BD+46 442, is a result of a binary interaction channel. The origin of the fast outflow in this system can be attributed to a gaseous disk around the secondary component, which is most likely a main sequence star. Our analysis suggests the outflow to have a rather wide opening angle instead of being strongly collimated. Our time resolved spectral monitoring reveals the launching site of the jet in the binary BD+46 442. Similar orbital phase-dependent Hα profiles are commonly observed in post-AGB binaries. Post-AGB binaries provide ideal test bets to study jet formation and launching mechanisms over a wide range of orbital conditions. Description: Reduced high-resolution (R∼85000) optical spectra of BD+46 442. These 104 spectra were obtained between July 2009 and January 2016 from the HERMES spectrograph, mounted on the 1.2m Flemish Mercator telescope at La Palma, Canary Islands, Spain. The spectra cover a wavelength range from 3770 to 9000 angstrom in logscale. The flux is given in arbitrary units. The spectra are collected as FITS files. The numbering of the spectra corresponds to the numbering in Table B.1 in the article (e.g. spec_15.fits corresponds to N=15). Objects: --------------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------------- 01 45 47.03 +46 49 01.0 BD+46 442 = IRAS 01427+4633 --------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 106 104 List of fits spectra fits/* 0 104 Individual spectra
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 6 I6 --- Nx Number of pixels along X-axis 8- 33 A26 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.ssssss) 35- 41 F7.5 [0.1nm] logWmin Lower value of wavelength interval 43- 49 F7.5 [0.1nm] logWmax Upper value of wavelength interval 51- 61 E11.6 0.1nm dW Wavelength resolution 63- 66 I4 Kibyte size Size of FITS file 68- 79 A12 --- FileName Name of FITS file, in subdirectory fits 81-106 A26 --- Title Title of the FITS file
Acknowledgements: Dylan Bollen, dylan.bollendb(at)gmail.com
(End) Dylan Bollen [KU Leuven], Patricia Vannier [CDS] 03-Aug-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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