Analysis of Optical and IR Light Curves of the Wr Binary V444 Cygni: Are Clumps Still Present?

1994 ◽  
pp. 239-248
Author(s):  
I. Antokhin
Keyword(s):  
Light Curves ◽  
Ir Light

scholarly journals A Data-driven Study of RR Lyrae Near-IR Light Curves: Principal Component Analysis, Robust Fits, and Metallicity Estimates

2018 ◽  
Vol 857 (1) ◽  
pp. 55 ◽  
Author(s):  
Gergely Hajdu ◽  
István Dékány ◽  
Márcio Catelan ◽  
Eva K. Grebel ◽  
Johanna Jurcsik
Keyword(s):  
Principal Component Analysis ◽  
Principal Component ◽  
Component Analysis ◽  
Light Curves ◽  
Data Driven ◽  
Rr Lyrae ◽  
Near Ir ◽  
Ir Light

scholarly journals The eclipsing binary TY CrA revisited: what near-IR light curves tell us★

2013 ◽  
Vol 431 (3) ◽  
pp. 2230-2239 ◽  
Author(s):  
M. Vaňko ◽  
M. Ammler-von Eiff ◽  
T. Pribulla ◽  
R. Chini ◽  
E. Covino ◽  
...  
Keyword(s):  
Light Curves ◽  
Eclipsing Binary ◽  
Near Ir ◽  
Ir Light

scholarly journals Optical and IR light curves of VV Puppis

1983 ◽  
Vol 203 (3) ◽  
pp. 749-757 ◽  
Author(s):  
P. Szkody ◽  
J. A. Bailey ◽  
J. H. Hough
Keyword(s):  
Light Curves ◽  
Ir Light

scholarly journals Variability with Wise

2011 ◽  
Vol 7 (S285) ◽  
pp. 334-336
Author(s):  
Douglas Hoffman ◽  
Roc Cutri ◽  
John Fowler ◽  
Frank Masci
Keyword(s):  
Light Curves ◽  
Maximum Period ◽  
Bl Lac ◽  
Ecliptic Latitude ◽  
Unknown Objects ◽  
Ir Light ◽  
Algol W

AbstractWise mapped the entire sky in four bands during its approximately 7-month cryogenic mission. The number of exposures for each point on the sky increased with ecliptic latitude, and ranged from ~12 on the ecliptic to over 1000 at the ecliptic poles. The observing cadence is well suited to studying variable objects with periods between ~2 hours to ~2 days on the ecliptic, with the maximum period increasing up to several weeks near the ecliptic poles. We present the method used to identify several types of variables in the Wise Preliminary Release Database, and the mid-IR light curves of several objects. Many of these objects are new, and include RR Lyr, Algol, W UMa, Mira, BL Lac and YSO-type variables, as well as some unknown objects.

scholarly journals New JHK Photometry of LS I +61 303

2000 ◽  
Vol 175 ◽  
pp. 727-730
Author(s):  
S. Martínez-Núñez ◽  
J. Fabregat
Keyword(s):  
Orbital Period ◽  
Compact Object ◽  
Light Curves ◽  
Circumstellar Envelope ◽  
Be Stars ◽  
X Ray ◽  
Close Orbit ◽  
Infrared Wavelengths ◽  
Ir Light

AbstractWe present new JHK photometry of the Be/X-ray binary L SI +61 303, obtained during the period 1994-1998. The IR light curves do not show the modulation with the orbital period apparently present in the smaller photometry set analyzed by Paredes et al. (1994).The reddening-corrected standard photometric values indicate that the circumstellar envelope is optically thick at infrared wavelengths, and much denser than those of isolated Be stars. It is argued that this higher density is produced by disk truncation due to the presence of the compact object in a close orbit.

scholarly journals The newly discovered Be/X-ray binary Swift J004516.6–734703 in the SMC: witnessing the emergence of a circumstellar disc

2020 ◽  
Vol 499 (1) ◽  
pp. L41-L46
Author(s):  
J A Kennea ◽  
M J Coe ◽  
P A Evans ◽  
I M Monageng ◽  
L J Townsend ◽  
...  
Keyword(s):  
Neutron Star ◽  
Binary System ◽  
Light Curves ◽  
Type I ◽  
Pulsation Period ◽  
X Ray ◽  
Tidal Interaction ◽  
Long Period ◽  
Periodicity Analysis ◽  
Ir Light

ABSTRACT We report on the discovery of Swift J004516.6–734703, a Be/X-ray binary system by the Swift SMC Survey, S-CUBED. Swift J004516.6–734703, or SXP 146.6, was found to be exhibiting a bright (∼1037 erg s−1) X-ray outburst on 2020 June 18. The historical UV and IR light-curves from OGLE and Swift/UVOT showed that after a long period of steady brightness, it experienced a significant brightening beginning around 2019 March. This IR/UV rise is likely the signature of the formation of a circumstellar disc, confirmed by the presence of strong an H α line in SALT spectroscopy, that was not previously present. Periodicity analysis of the OGLE data reveals a plausible 426 d binary period, and in X-ray a pulsation period of 146.6 s is detected. The onset of X-ray emission from Swift J004516.6–734703 is likely the signature of a Type-I outburst from the first periastron passage of the neutron star companion through the newly formed circumstellar disc. We note that the formation of the circumstellar disc began at the predicted time of the previous periastron passage, suggesting its formation was spurred by tidal interaction with the neutron star.

scholarly journals Infrared Observations of Symbiotic Miras

1988 ◽  
Vol 103 ◽  
pp. 47-56
Author(s):  
Patricia Whitelock
Keyword(s):  
Main Sequence ◽  
Light Curves ◽  
Physical Parameters ◽  
Infrared Observations ◽  
Mira Variables ◽  
Ir Light

AbstractSymbiotic Miras are identified by their infrared characteristics. It is shown how an understanding of the evolutionary position of normal Mira variables together with the empirically established period luminosity relation can be used to derive various physical parameters for similar objects in symbiotic systems. The pulsation periods of symbiotic Miras measured so far fall between 280 and 580 days, their ages must be in the 5–10 Gyr range while main sequence masses of the order 1 to 1.5 M⊙ are indicated. The obscuration events seen in the IR light curves of several symbiotic Miras are highlighted as potentially important and possible causes are discussed.

scholarly journals Fast infrared variability from the black hole candidate MAXI J1535−571 and tight constraints on the modelling

2021 ◽  
Vol 503 (1) ◽  
pp. 614-624
Author(s):  
F M Vincentelli ◽  
P Casella ◽  
D M Russell ◽  
M C Baglio ◽  
A Veledina ◽  
...  
Keyword(s):  
Black Hole ◽  
Cross Correlation ◽  
Light Curves ◽  
X Rays ◽  
X Ray ◽  
Black Hole Candidate ◽  
Near Ir ◽  
The Cross ◽  
Short Time ◽  
Ir Light

ABSTRACT We present the results regarding the analysis of the fast X-ray/infrared (IR) variability of the black hole transient MAXI J1535−571. The data studied in this work consist of two strictly simultaneous observations performed with XMM–Newton (X-rays: 0.7–10 keV), VLT/HAWK-I (Ks band, 2.2 μm) and VLT/VISIR (M and PAH2_2 bands, 4.85 and 11.88 μm, respectively). The cross-correlation function between the X-ray and near-IR light curves shows a strong asymmetric anticorrelation dip at positive lags. We detect a near-IR QPO (2.5σ) at 2.07 ± 0.09 Hz simultaneously with an X-ray QPO at approximately the same frequency (f0 = 2.25 ± 0.05). From the cross-spectral analysis, a lag consistent with zero was measured between the two oscillations. We also measure a significant correlation between the average near-IR and mid-IR fluxes during the second night, but find no correlation on short time-scales. We discuss these results in terms of the two main scenarios for fast IR variability (hot inflow and jet powered by internal shocks). In both cases, our preliminary modelling suggests the presence of a misalignment between the disc and jet.

scholarly journals INTERPRETATION OF OPTICAL AND IR LIGHT CURVES FOR TRANSITIONAL DISK CANDIDATES IN NGC 2264 USING THE EXTINCTED STELLAR RADIATION AND THE EMISSION OF OPTICALLY THIN DUST INSIDE THE HOLE

2021 ◽  
Vol 57 (2) ◽  
pp. 433-444
Author(s):  
E. Nagel ◽  
F. Gutiérrez-Canales ◽  
S. Morales-Gutiérrez ◽  
A. P. Sousa
Keyword(s):  
Radiative Transfer ◽  
Light Curves ◽  
Infrared Light ◽  
Stellar Radiation ◽  
Spectrum Modeling ◽  
Spectrum Fitting ◽  
Ir Light ◽  
Full Disk

In the stellar forming region NGC 2264 there are objects catalogued as hosting a transitional disk according to spectrum modeling. Four members of this set have optical and infrared light curves coming from the CoRoT and Spitzer telescopes. In this work, we try to simultaneously explain the light curves using the extinction of the stellar radiation and the emission of the dust inside the hole of a transitional disk. For the object Mon-296, we were successful. However, for Mon-314, and Mon-433 our evidence suggests that they host a pre-transitional disk. For Mon-1308 a new spectrum fitting using the 3D radiative transfer code Hyperion allows us to conclude that this object hosts a full disk instead of a transitional disk. This is in accord to previous work on Mon-1308 and with the fact that we cannot find a fit for the light curves using only the contribution of the dust inside the hole of a transitional disk.

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