J/ApJ/657/409 K-band light curve of GRS 1915+105 (Neil+, 2007)
Infrared monitoring of the microquasar GRS 1915+105: detection of orbital and
superhump signatures.
Neil E.T., Bailyn C.D., Cobb B.E.
<Astrophys. J., 657, 409-414 (2007)>
=2007ApJ...657..409N 2007ApJ...657..409N
ADC_Keywords: Binaries, X-ray ; QSOs ; Photometry
Keywords: accretion, accretion disks - black hole physics - infrared: stars -
X-rays: binaries - X-rays: individual (GRS 1915+105)
Abstract:
We present the results of 7 years of K-band monitoring of the low-mass
X-ray binary GRS 1915+105. Positive correlations between the infrared
flux and the X-ray flux and X-ray hardness are demonstrated. Analysis
of the frequency spectrum shows that the orbital period of the system
is Porb=30.8±0.2days. The phase and amplitude of the orbital
modulation suggests that the modulation is due to the heating of the
face of the secondary star. We also report another periodic signature
between 31.2 and 31.6days, most likely due to a superhump resonance.
From the superhump period we then obtain a range for the mass ratio of
the system, 0.05<q<0.12.
Description:
Our observations of GRS 1915+105 span seven seasons, from MJD 51652
to 53969 (2000 April 18 to 2006 August 21), with a total of 604
individual data points (see Table 1.) Data from 2000-2002 were taken
using the ANDICAM instrument and the Yale 1.0m telescope at the Cerro
Tololo Inter-American Observatory (CTIO), which was operated at the
time by the YALO consortium. Subsequent data were obtained using the
same instrument mounted on the 1.3m telescope originally constructed
for the Two Micron All Sky Survey (2MASS), also at CTIO and operated
by the Small and Moderate Aperture Research Telescope System (SMARTS)
consortium. All observations are internally dithered by a tiltable
mirror to remove artificial effects such as bad pixels and to allow
sky subtraction. Due to the large extinction, our observations are in
the K-band only.
Objects:
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RA (2000) DE Designation(s)
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19 15 11.5 +10 56 44 GRS 1915+105
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 16 604 Full K-band Data Set
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See also:
J/A+A/397/711 : Comptonization and reflection in GRS 1915+105 (Rau+, 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d MJD Mean Julian Date of Observation
12- 16 F5.2 mag Kmag The K-band magnitude
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jan-2009