J/A+A/462/1081 BVRIJHK light curves of 4U 0115+63/V635 Cas (Reig+, 2007)
The Be/X-ray transient 4U 0115+63/V635 Cassiopeiae.
III. Quasi-cyclic variability.
Reig P., Larionov V., Negueruela I., Arkharov A.A., Kudryavtseva N.A.
<Astron. Astrophys. 462, 1081 (2007)>
=2007A&A...462.1081R 2007A&A...462.1081R
ADC_Keywords: Binaries, X-ray ; Photometry, UBVRIJKLMNH
Keywords: stars: pulsars: individual: 4U 0115+63, V635 Cas - X-rays: binaries -
stars: neutron - stars: binaries close - stars: emission line, Be
Abstract:
4U 0115+63 is one of the most active and best studied Be/X-ray
transients. Previous studies of 4U 0115+63 have led to the suggestion
that 4U 0115+63 undergoes relatively fast quasi-cyclic activity.
However, due to the lack of good coverage of the observations, the
variability time scales are uncertain.
Our objective is to investigate the long-term behaviour of 4U
0115+63/V635 Cas to confirm its quasi-cyclic nature and to explain its
correlated optical/IR and X-ray variability.
We have performed optical/IR photometric observations and optical
spectroscopic observations of 4U 0115+63/V635 Cas over the last decade
with unprecedented coverage. We have focused on the Hα line
variability and the long-term changes of the photometric magnitudes
and colours and investigated these changes in correlation with the
X-ray activity of the source.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
01 18 31.9 +63 44 24 4U 0115+63 = V* V635 Cas
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 111 357 Photometric observations
table3.dat 50 43 Log of the optical spectroscopic observations
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.3 d MJDB ? Modified Julian Date for the B filter observation
11- 15 F5.2 mag Bmag ? B magnitude (1)
17- 25 F9.3 d MJDV ? Modified Julian Date for the V filter observation
27- 31 F5.2 mag Vmag ? V magnitude (1)
33- 41 F9.3 d MJDR Modified Julian Date for the R filter observation
43- 47 F5.2 mag Rmag R magnitude (1)
49- 57 F9.3 d MJDI ? Modified Julian Date for the I filter observation
59- 63 F5.2 mag Imag ? I magnitude (1)
65- 73 F9.3 d MJDJ ? Modified Julian Date for the J filter observation
75- 79 F5.2 mag Jmag ? J magnitude (1)
81- 89 F9.3 d MJDH ? Modified Julian Date for the H filter observation
91- 95 F5.2 mag Hmag ? H magnitude (1)
97-105 F9.3 d MJDK ? Modified Julian Date for the K filter observation
107-111 F5.2 mag Kmag ? K magnitude (1)
--------------------------------------------------------------------------------
Note (1): Uncertainties are ∼0.03 in B and ~<0.01 in the other bands.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "DD-MM-YYYY" Date Date of observation
12- 14 A3 --- Tel Telescope
16- 19 I4 0.1nm Range1 Wavelength range
20 A1 --- --- [-]
21- 25 I5 0.1nm Range2 Wavelength range
28- 36 F9.3 d MJD Modified Julian Date
38- 42 F5.1 0.1nm EWHa Halpha equivalent width
44- 46 F3.1 0.1nm e_EWHa rms uncertainty on EWHa
48- 50 A3 ---- PHa Profile of the Halpha line (1)
--------------------------------------------------------------------------------
Note (1): Profile of the Halpha line code as follows:
SP = single-peak
DP = double-peak
V>R = blue-dominated double-peak
V<R = red-dominated double-peak
V∼R = red and blue double-peaks equivalent
ABS = absorption
--------------------------------------------------------------------------------
Acknowledgements: Pablo Reig, pau(at)physics.uoc.gr
References:
Negueruela & Okazaki, Paper I 2001A&A...369..108N 2001A&A...369..108N
Negueruela et al. , Paper II 2001A&A...369..117N 2001A&A...369..117N
(End) Patricia Vannier [CDS] 10-Nov-2006