Binarity and multiperiodicity in high-amplitude delta Scuti stars (2008)
Derekas, A., Kiss, L. L., Bedding, T. R., Ashley, M. C. B., Csak, B., Danos, A., ...
We have carried out a photometric and spectroscopic survey of bright high-amplitude delta Scuti (HADS) stars. The aim was to detect binarity and multiperiodicity (or both) in order to explore the...
Christiansen, J. L., Derekas, A., Kiss, L. L., Ashley, M. C. B., Curran, S. J., Hamacher, D. W., ...
We present a new catalogue of variable stars compiled from data taken for the University of New South Wales Extrasolar Planet Search. From 2004 October to 2007 May, 25 target fields were each...
The first high-amplitude delta Scuti star in an eclipsing binary system (2007)
Christiansen, J. L., Derekas, A., Ashley, M. C. B., Webb, J. K., Hidas, M. G., Hamacher, D. W., ...
We report the discovery of the first high-amplitude delta Scuti star in an eclipsing binary, which we have designated UNSW-V-500. The system is an Algol-type semi-detached eclipsing binary of maximum...
ESC and KAIT Observations of the Transitional Type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at...
A new detached K7 dwarf eclipsing binary system (2007)
Young, T. B., Hidas, M. G., Webb, J. K., Ashley, M. C. B., Christiansen, J. L., Derekas, A., ...
We present an analysis of a new, detached, double-lined eclipsing binary system with K7 Ve components, discovered as part of the University of New South Wales Extrasolar Planet Search. The object is...
Derekas, A., Kiss, L. L., Bedding, T. R.
Eclipsing binaries offer a unique opportunity to determine fundamental physical parameters of stars using the constraints on the geometry of the systems. Here we present a reanalysis of publicly...
ESC and KAIT Observations of the Transitional Type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at...
ESC and KAIT observations of the transitional type Ia SN 2004eo (2007)
Pastorello, A., Mazzali, P. A., Pignata, G., Benetti, S., Cappellaro, E., Filippenko, A. V., ...
Kiss, L. L., Derekas, A., Szabo, Gy. M., Bedding, T. R., Szabados, L.
We analyse public domain time-series photometric observations of 30 known and candidate binary post-AGB stars for measuring pulsation and orbital periods. We derive periodicities for 17 stars for the...
RR Lyrae stars in the southern globular cluster NGC 362 (2006)
Szekely, P., Kiss, L. L., Jackson, R., Derekas, A., Csak, B., Szatmary, K.
NGC 362 is a bright southern globular cluster for which no extensive variability survey has ever been done. Time-series CCD photometric observations have been obtained. Light curves have been derived...
Eclipsing binaries in the LMC: a wealth of data for astrophysical tests (2006)
Derekas, A., Kiss, L. L., Bedding, T. R.
We have analysed publicly available MACHO observations of 6833 variable stars in the Large Magellanic Cloud, classified as eclipsing binaries. After finding that a significant fraction of the sample...
Ellipsoidal Variability and Long Secondary Periods in MACHO Red Giant Stars (2006)
Derekas, A., Kiss, L. L., Bedding, T. R., Kjeldsen, H., Lah, P., Szabo, Gy. M.
We present a period-luminosity-amplitude analysis of 5899 red giant and binary stars in the Large Magellanic Cloud, using publicly available observations of the MACHO project. For each star, we...
Nearby debris disk systems with high fractional luminosity reconsidered (2006)
Moor, A., Abraham, P., Derekas, A., Kiss, Cs., Kiss, L. L., Apai, D., ...
By searching the IRAS and ISO databases we compiled a list of 60 debris disks which exhibit the highest fractional luminosity values (fd>10^-4) in the vicinity of the Sun (d5x10^-4 are younger than...
Nearby debris disk systems with high fractional luminosity reconsidered (2006)
Moór, A., Ábrahám, P., Derekas, A., Kiss, Cs, Kiss, L. L., Apai, D., ...
By searching the IRAS and ISO databases, we compiled a list of 60 debris disks that exhibit the highest fractional luminosity values (fd>10-4) in the vicinity of the Sun (d5×10-4 are younger than...
Binarity and multiperiodicity in high-amplitude delta Scuti stars (2005)
Derekas, A., Kiss, L. L., Csak, B., Griffin, J., Lindstrom, C., Meszaros, Sz., ...
We present our first results for a sample of southern high-amplitude delta Scuti stars (HADS), based on a spectrophotometric survey started in 2003. For CY Aqr and AD CMi, we found very stable light...
A comprehensive survey of variable stars in the globular cluster NGC 362 (2005)
Székely, P., Kiss, L. L., Csák, B., Derekas, A., Bedding, T. R., Szatmáry, K.
We present the first results of our variability survey for the globular cluster NGC 362. We found numerous variable stars in the field including 23 RR Lyr stars, 4 eclipsing binaries and 5 other...
Lindstrom, C., Griffin, J., Kiss, L. L., Uemura, M., Derekas, A., Meszaros, Sz., ...
We present spectroscopic observations of the black-hole binary V4641 Sagittarii, obtained between 4th July 2004 and 28th March 2005, which cover the minor outburst of the star in early July 2004 and...
The UNSW Extrasolar Planet Search: Methods and First Results from a Field Centred on NGC 6633 (2005)
Hidas, M. G., Ashley, M. C. B., Webb, J. K., Irwin, M., Phillips, A., Toyozumi, H., ...
We report on the current status of the University of New South Wales Extrasolar Planet Search project, giving details of the methods we use to obtain millimagnitude precision photometry using the...
A first-overtone RR Lyrae star with cyclic period changes (2004)
Derekas, A., Kiss, L. L., Udalski, A., Bedding, T. R., Szatmary, K.
A detailed light curve analysis is presented for a first-overtone RR Lyrae star, MACHO* J050918.712-695015.31, based on MACHO and OGLE-III observations. As a foreground object of the Large Magellanic...
On the close optical companion of V1494 Aql: problems with light curve modelling (2003)
Kiss, L. L., Csak, B., Derekas, A.
New observations of the eclipsing nova V1494 Aql were analysed in order to estimate the effect of the optical companion located 1.4 arcsec southwest. R and I-band images (stellar FWHM~1.2-1.4 arcsec)...
The first CCD photometric study of the open cluster NGC 2126 (2003)
Gaspar, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, Cs., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~57 hours. Almost 1000...
Derekas, A., Kiss, L. L., Szekely, P., Alfaro, E. J., Csak, B., Meszaros, Sz., ...
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our...
Derekas, A., Kiss, L. L., Székely, P., Alfaro, E. J., Csák, B., Mészáros, Sz., ...
We present new photometric data for seven high-amplitude delta Scuti stars. The observations were acquired between 1996 and 2002, mostly in the Johnson photometric system. For one star (GW UMa), our...
VRI CCD photometry of NGC 2126 (2003)
Gáspár, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, C., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~57 hours. Almost 1000...
The first CCD photometric study of the open cluster NGC 2126 (2003)
Gáspár, A., Kiss, L. L., Bedding, T. R., Derekas, A., Kaspi, S., Kiss, Cs., ...
We present the first CCD photometric observations of the northern open cluster NGC 2126. Data were taken on eight nights in February and December 2002 with a total time span of ~ 57 hours. Almost...
The Type la Supernova 2001V in NGC 3987 (2002)
Vinko, J., Biro, I. B., Csak, B., Csizmadia, Sz., Derekas, A., Furesz, G., ...
CCD photometry of the type Ia SN 2001V occured in the edge-on spiral galaxy NGC 3987 is presented. The observations made through Johnson-Cousins BVRI filters were collected from Feb. 24 (t = -8 days,...
Kiss, L. L., Derekas, A., Meszaros, Sz., Szekely, P.
We present the first results of an observational project, which addresses the period changing behaviour of a sample of high-amplitude delta Scuti stars. In this paper we discuss the double-mode...
The multimode pulsation of the delta Scuti star V784 Cassiopeae (2002)
Kiss, L. L., Derekas, A., Alfaro, E. J., Biro, I. B., Csak, B., Garrido, R., ...
We present an analysis of new Johnson and Stromgren photometric and medium-resolution spectroscopic observations of the delta Scuti type variable star V784 Cassiopeae. The data were obtained in three...
Nova Cygni 2001/2 = V2275 Cyg (2002)
Kiss, L. L., Gogh, N., Vinko, J., Furesz, G., Csak, B., DeBond, H., ...
We present an analysis of low- and medium resolution spectra of the very fast nova, Nova Cygni 2001/2 (V2275 Cyg) obtained at nine epochs in August, September and October, 2001. The expansion...