## Search

Now showing items 1-10 of 21

#### Multiple regression of GRB luminosity on light-curve properties

(Oxford University Press, 2009)

Statistical relations between the luminosity L of gamma-ray burster (GRBs) and several of
their other observable properties have been discovered. Four of these properties are considered
here: the spectral lag; a measure ...

#### On multiple classes of gamma-ray bursts, as deduced from autocorrelation functions or bivariate duration/hardness ratio distributions

(Oxford University Press, 2012)

Autocorrelation functions (ACFs) of 119 gamma-ray bursts (GRBs) monitored by the Burst
Alert Telescope (BAT) on Swift are calculated. Contrasting with previous results for smaller
numbers of bursts from other missions, ...

#### Confidence intervals for the correlation between the gamma-ray burst peak energy and the associated supernova peak brightness

(Oxford University Press, 2009)

A strong correlation between the gamma-ray burster peak energy and the peak luminosity
of the associated supernova was discovered by Li for four GRBs. Despite the fact that the
formal significance level of the correlation ...

#### What can be deduced from open cluster metallicity measurements?

(Oxford University Press, 2007)

The dependence of [Fe/H] on galactocentric distance, distance from the galactic mid-plane
and age is studied. Both ordinary least-squares and non-parametric regression in the form of a
‘generalized additive model’ are ...

#### The analysis of indexed astronomical time series – X. Significance testing of O − C data

(Oxford University Press, 2006)

It is assumed that O − C (‘observed minus calculated’) values of periodic variable stars are
determined by three processes, namely measurement errors, random cycle-to-cycle jitter in
the period, and possibly long-term ...

#### The detailed forms of the LMC Cepheid PL and PLC relations

(Oxford University Press, 2007)

Possible deviations from linearity of the Large Magellanic Cloud Cepheid period–luminosity
(PL) and period–luminosity–colour (PLC) relations are investigated. Two data sets are studied,
respectively from the Optical ...

#### The Nyquist frequency for time series with slight deviations from regular spacing

(Oxford University Press, 2009)

The paper is based on the notion that the Nyquist frequency νN is a symmetry point of the
periodogram of a time series: the power spectrum at frequencies above νN is a mirror image
of that below νN. Koen showed that the ...

#### Estimation of the coherence time of stochastic oscillations from modest samples

(Oxford University Press, 2012)

‘Quasi-periodic’ or ‘solar-like’ oscillations can be described by three parameters – a characteristic
frequency, a coherence time (or ‘quality factor’) and the variance of the random
driving process. This paper is concerned ...

#### The analysis of irregularly observed stochastic astronomical time-series – I. Basics of linear stochastic differential equations

(Oxford University Press, 2005)

The theory of low-order linear stochastic differential equations is reviewed. Solutions to these
equations give the continuous time analogues of discrete time autoregressive time-series. Explicit
forms for the power ...

#### On the upper limit on stellar masses in the Large Magellanic Cloud cluster R136

(Oxford University Press, 2006)

A truncated power-law distribution is fitted to the 29 largest stellar masses known in R136.
Two different statistical techniques are used, with comparable results. An upper limit to the
mass distribution of the order ...