J/A+A/570/A3 Optical spectrum of HD50975 (Sperauskas+, 2014)
HD50975: a yellow supergiant in a spectroscopic binary system.
Sperauskas J., Zacs L., Raudeliunas S., Musaev F., Puzin V.
<Astron. Astrophys. 570, A3 (2014)>
=2014A&A...570A...3S 2014A&A...570A...3S
ADC_Keywords: Binaries, spectroscopic ; Stars, supergiant ; Spectroscopy
Keywords: binaries: spectroscopic - stars:evolution -
stars: fundamental parameters - tars: individual: HD 50975 -
stars: abundances
Abstract:
Recent detection of a yellow supergiant star as a possible progenitor
of a supernova has posed serious questions about our understanding of
the evolution of massive stars.
The spectroscopic binary star HD50975 with an unseen hot secondary was
studied in detail with the main goal of estimating fundamental
parameters of both components and the binary system.
A comprehensive analysis and modeling of collected long-term radial
velocity measurements, photometric data, and spectra was performed to
calculate orbital elements, atmospheric parameters, abundances, and
luminosities. The spectrum in an ultraviolet region was studied to
clarify the nature of an unseen companion star.
Description:
The spectrum of the hot secondary star dominates the composite
spectrum of HD50975 in the far ultraviolet spectral region.
Low-dispersion spectra observed by SWP and LWR cameras (SWP 04082 and
LWR03613) are available for HD50975 in the IUE archive. We used IUE
NEWSIPS data recalibrated by Massa & Fitzpatrick (2000ApJS..126..517M 2000ApJS..126..517M)
in order to minimize systematic errors. To avoid the 2200Å
interstellar extinction bump and the possible influence of primary
star HD50975A we employed only spectra observed by SWP camera. In
addition, spectra of four comparison stars of spectral types between
B1 and B4 were extracted from the database.
File spectrum.dat contains the reduced averaged high-resolution
spectrum of HD50975.
Objects:
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RA (2000) DE Designation(s)
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06 55 48.23 +08 52 38.8 HD 50975 = HIP 33317
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
spectrum.dat 16 60769 Normalized spectrum of HD50975
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Byte-by-byte Description of file: spectrum.dat
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Bytes Format Units Label Explanations
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1- 9 F9.4 0.1nm lambda [4147/8940] Wavelength λ
11- 16 F6.4 --- RFlux [0.01/1.05] Relative flux
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Acknowledgements:
L. Zacs, zacs(at)latnet.lv
(End) Patricia Vannier [CDS] 29-Sep-2014