Two-star high-speed photometry

1981 ◽  
Vol 93 ◽  
pp. 388 ◽  
Author(s):  
A. D. Grauer ◽  
H. E. Bond
Keyword(s):  
High Speed ◽  
High Speed Photometry

scholarly journals HIGH-SPEED PHOTOMETRY OF THE DISINTEGRATING PLANETESIMALS AT WD1145+017: EVIDENCE FOR RAPID DYNAMICAL EVOLUTION

2016 ◽  
Vol 818 (1) ◽  
pp. L7 ◽  
Author(s):  
B. T. Gänsicke ◽  
A. Aungwerojwit ◽  
T. R. Marsh ◽  
V. S. Dhillon ◽  
D. I. Sahman ◽  
...  
Keyword(s):  
High Speed ◽  
Dynamical Evolution ◽  
High Speed Photometry

The Moderate and High-Speed Photometry of the Black Hole Candidate XTE J1118+480

Microquasars ◽  
2001 ◽  
pp. 63-64
Author(s):  
Elena P. Pavlenko ◽  
Elena S. Dmitrienko ◽  
Nikolai M. Shakhovskoi ◽  
Sergei Yu. Shugarov ◽  
Nataly A. Katysheva ◽  
...  
Keyword(s):  
Black Hole ◽  
High Speed ◽  
Black Hole Candidate ◽  
High Speed Photometry

scholarly journals High-Speed Photometry of Cluster Flare Stars

1975 ◽  
Vol 67 ◽  
pp. 69-73
Author(s):  
M. Rodonò
Keyword(s):  
High Speed ◽  
Activity Level ◽  
Flare Star ◽  
Solar Neighbourhood ◽  
High Occurrence ◽  
High Speed Photometry ◽  
Flare Stars ◽  
Photoelectric Observations ◽  
Absolute Luminosity

Recent photoelectric observations made at Catania Observatory show a high occurrence of short-lived faint flares on the Hyades member II Tau (H II 2411). Its activity level turns out to be higher than for UV Cet-type stars of equal absolute luminosity.II Tau could represent a transition prototype between UV Cet-type flare star in the solar neighbourhood and cluster ones.The importance of coordinated photoelectric patrol of properly selected flare stars in clusters of different age is emphasized.

scholarly journals High-speed photometry of faint cataclysmic variables – VIII. Targets from the Catalina Real-Time Transient Survey

2013 ◽  
Vol 437 (1) ◽  
pp. 510-523 ◽  
Author(s):  
Deanne L. Coppejans ◽  
Patrick A. Woudt ◽  
Brian Warner ◽  
Elmar Körding ◽  
Sally A. Macfarlane ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Cataclysmic Variables ◽  
High Speed Photometry

scholarly journals PG1159-035: A New, Hot, Non-DA Pulsating Degenerate

1979 ◽  
Vol 53 ◽  
pp. 377-381 ◽  
Author(s):  
J. T. McGraw ◽  
S. G. Starrfield ◽  
J. Liebert ◽  
R. Green
Keyword(s):  
Mass Transfer ◽  
Accretion Disk ◽  
High Speed ◽  
Period Range ◽  
High Speed Photometry ◽  
Blue Object ◽  
Orbital Modulation ◽  
Absorption Features ◽  
Narrow Emission

PG1159-035 was originally detected as a 14.5 mag. blue object in a survey for QSO candidates (Green 1977), An SIT spectrogram obtained at the Hale 5m telescope at 6Å resolution showed this star to have a very blue continuum with absorption features near λ4686 and λ4650 which were tentatively attributed to Hell and the CIII/CIV complex, respectively. Possible narrow emission components to these lines appear in Figure 1 which shows confirming spectra obtained with the IIDS (at 2.5Å resolution) on the Kitt Peak 2.1m telescope. The blue continuum and possible presence of Hell in emission suggested that this star was perhaps similar to the helium mass-transfer binary AM CVn (HZ 29). For this reason, we put PG1159-035 on our program of high-speed photometry, expecting the star to show “flickering” associated with mass transfer into an accretion disk and possible orbital modulation or eclipses in the period range 10-20 minutes—photometric characteristics similar to those observed in AM CVn.

scholarly journals White Dwarf Pulsations

1980 ◽  
Vol 5 ◽  
pp. 469-472
Author(s):  
W. Dziembowski
Keyword(s):  
Effective Temperature ◽  
High Speed ◽  
White Dwarfs ◽  
Binary Systems ◽  
Early Suggestion ◽  
Nonradial Oscillation ◽  
High Speed Photometry ◽  
Long Time ◽  
Nuclear Burning ◽  
Radial Pulsations

It has been known for a long time that white dwarfs are pulsationally unstable if nuclear burning takes place in their envelopes. Perturbation of energy generation rate promotes pulsational instability and this effect is frequently referred to as ε-mechanism. In recent years, with the advent of high-speed photometry, many rapidly varying white dwarfs have been discovered. However, periods of variability were found to be significantly longer than the periods of radial pulsations which were the only type of oscillations considered before the discovery. Furthermore, the case of ε-mechanism as being responsible for the observed variability has never been made strong for any of the observed objects.Variable white dwarfs are found among: Io single DA-type objects in the effective temperature range 10000-15000K; 2o members of close, usually but not always, cataclysmic binary systems. Although, following an early suggestion by Warner and Robinson (1972), the excitation of nonradial oscillation is postulated in both cases, the two types represent very different physical situations and they will be discussed here separately.

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