J/A+A/559/A87 Hα observations of LSI+61 303 (Zamanov+, 2013)
Hα observations of the gamma-ray-emitting Be/X-ray binary LSI+61 303:
orbital modulation, disk truncation, and long-term variability.
Zamanov R., Stoyanov K., Marti J., Tomov N.A., Belcheva G.,
Luque-Escamilla P.L., Latev G.
<Astron. Astrophys. 559, A87 (2013)>
=2013A&A...559A..87Z 2013A&A...559A..87Z
ADC_Keywords: Binaries, X-ray ; Spectroscopy ; Equivalent widths ;
Radial velocities
Keywords: stars: individual: LSI+61 303 - stars: winds, outflows -
stars: emission-line, Be - X-rays: binaries
Abstract:
We report 137 spectral observations of the Hα emission line of
the radio- and gamma-ray-emitting Be/X-ray binary LSI+61 303 obtained
during the period of September 1998 - January 2013.
From measuring various Hα parameters, we found that the orbital
modulation of the Hα is best visible in the equivalent width
ratio EW(B)/EW(R), the equivalent width of the blue hump, and in the
radial velocity of the central dip.
The periodogram analysis confirmed that the Hα emission is
modulated with the orbital and superorbital periods. For the past 20
years the radius of the circumstellar disk is similar to the Roche
lobe size at the periastron. It is probably truncated by a 6:1
resonance. The orbital maximum of the equivalent width of Hα
emission peaks after the periastron and coincides on average with the
X-ray and gamma-ray maxima.
Description:
Optical spectroscopic observations of the Hα emission line (137
spectra obtained during the period of September 1998 - January 2013)
are presented for the the radio- and gamma-ray-emitting Be/X-ray
binary LSI+61 303.
Objects:
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RA (2000) DE Designation(s)
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02 40 31.67 +61 13 45.6 LSI+61 303 = V* V615 Cas
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 138 Hα emission line of LSI+61 303
sp/* . 137 FITS files with spectra
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See also:
J/ApJ/656/437 : LSI+61 303 radial velocities and Halpha EW (Grundstrom+, 2007)
J/ApJ/698/514 : Radial velocities of LSI+61 303 and LS 5039 (Aragona+, 2009)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- specID Spectrum identification
13- 24 F12.4 d JD Julian Date of observation
26- 27 I2 min Texp Exposure time
29- 30 I2 --- S/N Signal-to-noise ratio
32- 36 F5.2 0.1nm EW Total equivalent width of the Hα emission
38- 42 F5.1 km/s HRV(cd) ? Central dip heliocentric radial velocity
44- 49 F6.1 km/s HRV(R) ? Red hump heliocentric radial velocity
51- 55 F5.1 km/s HRV(B) ? Blue hump heliocentric radial velocity
57- 61 F5.3 --- B/R ? Ratio between the EW of blue and red humps
63- 66 F4.2 --- I(B) ? Intensity of the blue peak
68- 71 F4.2 --- I(R) ? Intensity of the red peak
73- 76 F4.2 --- I(cd) ? Intensity of the central depression
78- 82 F5.1 km/s RV(HeI) ? HeI6678 absorption line radial velocity
84-103 A20 --- FileName Name of the fits file in subdirectory sp
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Acknowledgements:
Radoslav K. Zamanov, rkz(at)astro.bas.bg
References:
Paredes et al., 1994A&A...288..519P 1994A&A...288..519P
Zamanov et al., 1999A&A...351..543Z 1999A&A...351..543Z
(End) Patricia Vannier [CDS] 18-Sep-2013