Comparison of the scintillation noise above different observatories measured with MASS instruments

Kornilov, V.; Sarazin, M.; Tokovinin, Andreï; Travouillon, Tony; Voziakova, O.

doi:10.1051/0004-6361/201219954

Cited by 19 publications

(34 citation statements)

References 29 publications

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“…7, we compare measured scintillation statistics from several major observatories around the world (Kornilov et al 2012) including the values we have determined for La Palma in Fig. 6.…”

Section: Comparing Measured Scintillation Noise With Young's Approximmentioning

confidence: 99%

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Atmospheric scintillation in astronomical photometry

Osborn¹,

Föhring²,

Dhillon³

et al. 2015

Mon. Not. R. Astron. Soc.

103

118

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“…7, we compare measured scintillation statistics from several major observatories around the world (Kornilov et al 2012) including the values we have determined for La Palma in Fig. 6.…”

Section: Comparing Measured Scintillation Noise With Young's Approximmentioning

confidence: 99%

“…This equation is regularly used by many astronomers (for example Southworth et al 2009) to estimate the scintillation noise in their measurements. Recent work by Kornilov et al (2012) showed that this equation tends to underestimate the median scintillation noise by a mean factor of 1.5.…”

mentioning

confidence: 99%

Atmospheric scintillation in astronomical photometry

Osborn¹,

Föhring²,

Dhillon³

et al. 2015

Mon. Not. R. Astron. Soc.

103

118

View full text Add to dashboard Cite

show abstract

“…It is important to note that the quantities being summed are not correlated in the earlier paper [6], but our quantities are correlated. Moreover, equations (12) and (11) have the form of the sum of the log-normally distributed quantities only when Taylor series decomposition has been applied in the following way:…”

Section: Forecastingmentioning

confidence: 99%

“…The partial derivatives of γ 2,3 are calculated with respect to the implicit function theorem and using equations (11) and (12). The mean and the covariance of the log-normally distributed quantities i are exactly given by expressions (15) and (16).…”

Section: Forecastingmentioning

confidence: 99%

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Forecasting seeing and parameters of long-exposure images by means of ARIMA

Kornilov

2015

Exp Astron

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Atmospheric turbulence is the one of the major limiting factors for groundbased astronomical observations. In this paper, the problem of short-term forecasting seeing is discussed. The real data that were obtained by atmospheric optical turbulence (OT) measurements above Mount Shatdzhatmaz in 2007-2013 have been analysed. Linear auto-regressive integrated moving average (ARIMA) models are used for the forecasting. A new procedure for forecasting the image characteristics of direct astronomical observations (central image intensity, full width at half maximum, radius encircling 80 % of the energy) has been proposed. Probability density functions of the forecast of these quantities are 1.5-2 times thinner than the respective unconditional probability density functions. Overall, this study found that the described technique could adequately describe temporal stochastic variations of the OT power.

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The Nainital-Cape Survey

Joshi

Martinez

Chowdhury

et al. 2016

A&A

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Context. The Nainital-Cape Survey is a dedicated ongoing survey program to search for and study pulsational variability in chemically peculiar (CP) stars to understand their internal structure and evolution. Aims. The main aims of this survey are to find new pulsating Ap and Am stars in the northern and southern hemisphere and to perform asteroseismic studies of these new pulsators. Methods. The survey is conducted using high-speed photometry. The candidate stars were selected on the basis of having Strömgren photometric indices similar to those of known pulsating CP stars. Results. Over the last decade a total of 337 candidate pulsating CP stars were observed for the Nainital-Cape Survey, making it one of the longest ground-based surveys for pulsation in CP stars in terms of time span and sample size. The previous papers of this series presented seven new pulsating variables and 229 null results. In this paper we present the light curves, frequency spectra and various astrophysical parameters of the 108 additional CP stars observed since the last reported results. We also tabulated the basic physical parameters of the known roAp stars. As a part of establishing the detection limits in the Nainital-Cape Survey, we investigated the scintillation noise level at the two observing sites used in this survey, Sutherland and Nainital, by comparing the combined frequency spectra stars observed from each location. Our analysis shows that both the sites permit the detection of variations of the order of 0.6 milli-magnitude (mmag) in the frequency range 1-4 mHz, Sutherland is on average marginally better.

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Comparison of the scintillation noise above different observatories measured with MASS instruments

Cited by 19 publications

References 29 publications

Atmospheric scintillation in astronomical photometry

Atmospheric scintillation in astronomical photometry

Forecasting seeing and parameters of long-exposure images by means of ARIMA

The Nainital-Cape Survey

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