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Papers by Ioan Constantin Negulescu

Fundamental rights, freedoms, and duties are not only a reality but also a condition for a democr... more Fundamental rights, freedoms, and duties are not only a reality but also a condition for a democratic society. Fundamental rights, freedoms, and duties, with their many ramifications and theoretical and practical implications, are an important area in the concerns of each state. The constitutional principles applicable to the fundamental rights, freedoms, and duties of Romanian citizens are generally recognized mandatory rules that have proven their reliability over time. Their institutionalization at the constitutional level provides them with the most effective legal guarantee, as they benefit both from mechanisms guaranteeing the supremacy of constitutional norms, as well as from legal mechanisms specific to the protection of subjective rights. Regulated in the Constitution of Romania, these principles refer to universality, no retroactivity, equality, legal protection, free access to justice, restriction of rights or freedoms, and the presumption of innocence. The present paper ...

Aims. We observed a new and poorly studied cataclysmic variable (CV) SDSS J123813.73-033933.0 to ... more Aims. We observed a new and poorly studied cataclysmic variable (CV) SDSS J123813.73-033933.0 to determine its classification and binary parameters. Methods. Simultaneous time-resolved photometric and spectroscopic observations were carried out to conduct period analysis and Doppler tomography mapping. Results. From radial velocity measurements of the Hα line we determined its orbital period to be 0.05592 ± 0.00035 days (80.53min). This period is longer than the first estimate of 76 min by , but still at the very edge of the period limit for hydrogen-rich CVs. The spectrum shows double-peaked Balmer emission lines flanked by strong broad Balmer absorption, indicating a dominant contribution by the white dwarf primary star, and is similar to the spectra of short-period low-mass transfer WZ Sge-like systems. The photometric light curve shows complex variability. The system undergoes cyclic brightening up to 0.4 mags, which are of semi-periodic nature with periods of the order of 8-12 hours. We also detect a 40.25 min variability of ∼ 0.15 mag corresponding to half of the orbital period. Amplitude of the latter increases with the cyclic brightening of the system. We discuss the variable accretion rate and its impact on the hot spot as the most probable reason for both observed processes. Conclusions. SDSS J123813.73-033933.0 is preliminary classified as a WZ Sge-like short period system with low and unstable accretion rate.

Fundamental rights, freedoms, and duties are not only a reality but also a condition for a democr... more Fundamental rights, freedoms, and duties are not only a reality but also a condition for a democratic society. Fundamental rights, freedoms, and duties, with their many ramifications and theoretical and practical implications, are an important area in the concerns of each state. The constitutional principles applicable to the fundamental rights, freedoms, and duties of Romanian citizens are generally recognized mandatory rules that have proven their reliability over time. Their institutionalization at the constitutional level provides them with the most effective legal guarantee, as they benefit both from mechanisms guaranteeing the supremacy of constitutional norms, as well as from legal mechanisms specific to the protection of subjective rights. Regulated in the Constitution of Romania, these principles refer to universality, no retroactivity, equality, legal protection, free access to justice, restriction of rights or freedoms, and the presumption of innocence. The present paper ...

Aims. We observed a new and poorly studied cataclysmic variable (CV) SDSS J123813.73-033933.0 to ... more Aims. We observed a new and poorly studied cataclysmic variable (CV) SDSS J123813.73-033933.0 to determine its classification and binary parameters. Methods. Simultaneous time-resolved photometric and spectroscopic observations were carried out to conduct period analysis and Doppler tomography mapping. Results. From radial velocity measurements of the Hα line we determined its orbital period to be 0.05592 ± 0.00035 days (80.53min). This period is longer than the first estimate of 76 min by , but still at the very edge of the period limit for hydrogen-rich CVs. The spectrum shows double-peaked Balmer emission lines flanked by strong broad Balmer absorption, indicating a dominant contribution by the white dwarf primary star, and is similar to the spectra of short-period low-mass transfer WZ Sge-like systems. The photometric light curve shows complex variability. The system undergoes cyclic brightening up to 0.4 mags, which are of semi-periodic nature with periods of the order of 8-12 hours. We also detect a 40.25 min variability of ∼ 0.15 mag corresponding to half of the orbital period. Amplitude of the latter increases with the cyclic brightening of the system. We discuss the variable accretion rate and its impact on the hot spot as the most probable reason for both observed processes. Conclusions. SDSS J123813.73-033933.0 is preliminary classified as a WZ Sge-like short period system with low and unstable accretion rate.