Publications (19)
Exploring the circumstellar environment of the young eruptive star V2492 Cyg
Ã. Kóspál, P. Ãbrahám, J. A. Acosta-Pulido +20
Context. V2492 Cyg is a young eruptive star that went into outburst in 2010. The near-infrared color changes observed since the outburst peak suggest that the source belongs to a n…
The Multi-periodic Blazhko Modulation of CZ Lacertae
Ã. Sódor, J. Jurcsik, B. Szeidl +7
Thorough analysis of the multicolour CCD observations of the RRab-type variable, CZ Lacertae is presented. The observations were carried out in two consecutive observing seasons in…
The shortest modulation period Blazhko RR Lyrae star: SS Cnc
J. Jurcsik, B. Szeidl, Ã. Sódor +6
Extended BV(RI)c CCD observations of SS Cnc, a short period RRab star are presented. Nearly 1400 data points in each band have been obtained spanning over 79 days during the spring…
Pulsational and evolutionary analysis of the double-mode RR Lyrae star BS Com
I. Dekany, G. Kovacs, J. Jurcsik +8
We derive the basic physical parameters of the field double-mode RR Lyrae star BS Com from its observed periods and the requirement of consistency between the pulsational and evolu…
An UXor among FUors: extinction related brightness variations of the young eruptive star V582 Aur
P. Ãbrahám, Ã. Kóspál, M. Kun +24
V582 Aur is an FU Ori-type young eruptive star in outburst since 1985. The eruption is currently in a relatively constant plateau phase, with photometric and spectroscopic va…
Extensive Spectroscopy and Photometry of the Type IIP Supernova 2013ej
G. Dhungana, R. Kehoe, J. Vinko +32
We present extensive optical (, , and open CCD) and near-infrared () photometry for the very nearby Type IIP SN ~2013ej extending from +1 to +461 days after…
The Blazhko behaviour of RR Geminorum I - CCD photometric results in 2004
J. Jurcsik, Ã. Sódor, M. Váradi +9
Extended CCD monitoring of RR Gem revealed that it is a Blazhko type RRab star with the shortest Blazhko period (7.23d) and smallest modulation amplitude (Delta Mmax<0.1 mag) curre…
Hunting for binary Cepheids using lucky imaging technique
P. Klagyivik, L. Szabados, A. Szing +1
Detecting companions to Cepheids is difficult. In most cases the bright pulsator overshines the fainter secondary. Since Cepheids play a key role in determining the cosmic distance…
A multi-epoch, multi-wavelength study of the classical FUor V1515 Cyg approaching quiescence
Zs. M. Szabó, Ã. Kóspál, P. Ãbrahám +28
Historically, FU Orionis-type stars are low-mass, pre-main sequence stars. The members of this class experience powerful accretion outbursts and remain in an enhanced accretion sta…
A study of the photometric and spectroscopic variations of the prototypical FU Orionis-type star V1057 Cyg
Zs. M. Szabó, Ã. Kóspál, P. Ãbrahám +19
Among the low-mass pre-main sequence stars, a small group called FU Orionis-type objects (FUors) are notable for undergoing powerful accretion outbursts. V1057 Cyg, a classical exa…
Overtone and multi-mode RR Lyrae stars in the globular cluster M3
J. Jurcsik, P. Smitola, G. Hajdu +15
The overtone and multi-mode RR Lyrae stars in the globular cluster M3 are studied using a 200-d long, and time-series photometry obtained in 2012. 70\% of the…
Testing SNe Ia distance measurement methods with SN 2011fe
J. Vinko, K. Sarneczky, K. Takats +17
The nearby, bright, almost completely unreddened Type Ia supernova 2011fe in M101 provides a unique opportunity to test both the precision and the accuracy of the extragalactic dis…
An extensive photometric study of the Blazhko RR Lyrae star MW Lyr: II. Changes in the physical parameters
J. Jurcsik, Ã. Sódor, B. Szeidl +11
The analysis of the multicolour photometric observations of MW Lyr, a large modulation amplitude Blazhko variable, shows for the first time how the mean global physical parameters…
A peculiar young eruptive star in the dark cloud Lynds 1340
M. Kun, E. Szegedi-Elek, A. Moór +10
We conducted a long-term optical photometric and spectroscopic monitoring of the strongly variable, accreting young sun-like star [KOS94] HA11, associated with the dark cloud Lynds…
Absolute Distances to Nearby Type Ia Supernovae via Light Curve Fitting Methods
J. Vinkó, A. Ordasi, T. Szalai +22
We present a comparative study of absolute distances to a sample of very nearby, bright Type Ia supernovae (SNe) derived from high cadence, high signal-to-noise, multi-band photome…
Photometric and radial-velocity time-series of RR Lyrae stars in M3: analysis of single-mode variables
J. Jurcsik, P. Smitola, G. Hajdu +18
We present the first simultaneous photometric and spectroscopic investigation of a large set of RR Lyrae variables in a globular cluster. The radial-velocity data presented compris…
Determination of the iron content of Cepheids from the shape of their light curves
P. Klagyivik, L. Szabados, A. Szing +2
We present the study of the metallicity dependence of the Fourier amplitude ratios R_21 and R_31 for the light curves of short-period Galactic classical Cepheids in B, V, R_C and I…
An extensive photometric study of the Blazhko RR Lyrae star MW Lyr: I. Light curve solution
J. Jurcsik, Ã. Sódor, Zs. Hurta +10
We have obtained the most extensive and most accurate photometric data of a Blazhko variable MW Lyr during the 2006-2007 observing seasons. The data within each 0.05 phase bin of t…
Multi-wavelength study of the low-luminosity outbursting young star HBC 722
Ã. Kóspál, P. Ãbrahám, J. A. Acosta-Pulido +22
HBC 722 (V2493 Cyg) is a young eruptive star in outburst since 2010. It is an FU Orionis-type object with an atypically low outburst luminosity. Because it was well characterized i…