J/ApJ/909/149 Be star omega CMa V light curve & polarimetry (Ghoreyshi+, 2021)
A multi-technique study of the dynamical evolution of the viscous disk around
the Be star omega CMa.
Ghoreyshi M.R., Carciofi A.C., Faes D.M.
<Astrophys. J. 909, 149 (2021)>
=2021ApJ...909..149G 2021ApJ...909..149G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, Be ; Stars, variable ; Photometry ; Polarization
Keywords: Be stars - massive stars - stellar rotation - circumstellar matter -
variable stars - starlight polarization - spectroscopy -
emission line stars
Abstract:
The fact that the emission lines seen in the optical spectra of the Be
stars originate from a Keplerian circumstellar disk surrounding the
central star is gaining more and more observational and theoretical
supports. Among all the proposed models explaining the physics of such
disks, the Viscous Decretion Disk (VDD) paradigm matches best with the
observations. In this work, we challenge the VDD model by applying it
to the variety of data of the Be star ω CMa observed by
different techniques. We find that the VDD model explains the data
well, qualitatively. However, we see some quantitative discrepancies
that in turn are clues for better understanding the underlying physics
of the Be disks. We investigate the possibilities of existing an
undetected binary companion, and a radially variable viscous
parameter, α to explain the mismatch between the data and the
model.
Description:
This data set includes the photometric data of the Be star
ω CMa.
Objects:
-------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------
07 14 48.65 -26 46 21.6 omega CMa = HR 2749
-------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
photom.dat 25 3100 V-band data of the Be star ω CMa
polarime.dat 69 211 Polarimetric data of the Be star ω CMa
--------------------------------------------------------------------------------
Byte-by-byte Description of file: photom.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 F10.4 d MJD Modified Julian date
13- 17 F5.3 mag Vmag V magnitude
21- 25 F5.3 mag e_Vmag rms uncertainty on Vmag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: polarime.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 F12.6 d MJD Modified Julian date
15- 24 A10 "date" Obs.date Observation date
26 A1 --- Filt [UBVRI] Filter
28- 33 F6.4 % P Polarisation degree P in filter
35- 41 F7.4 % Q Stock parameter Q in filter
43- 49 F7.4 % U Stock parameter U in filter
51- 56 F6.2 deg theta Polarisation angle in filter
58- 63 F6.4 % e_P rms uncertainty on P
65- 69 F5.2 deg e_theta rms uncertainty on theta
--------------------------------------------------------------------------------
Acknowledgements:
Mohammad Reza Ghoreyshi, sghoreys(at)uwo.ca
(End) Patricia Vannier [CDS] 12-Feb-2020