Zobrazeno 1 - 10
of 3 011
pro vyhledávání: '"RR LYRAE VARIABLES"'
Publikováno v:
2024, Astrophysical Bulletin, Vol. 79, No. 3
We present an analysis of the relative abundance features of a number of chemical elements in the atmospheres of metal-rich ($\rm{[Fe/H]} > -1.0$) Galactic-field RR~Lyrae variable stars and the kinematic characteristics of these stars. We have previo
Externí odkaz:
http://arxiv.org/abs/2408.03107
Autor:
Kumar, Nitesh, Bhardwaj, Anupam, Singh, Harinder P., Rejkuba, Marina, Marconi, Marcella, Prugniel, Philippe
We present a comprehensive photometric study of RR Lyrae stars in the M3 globular cluster, utilising a vast dataset of 3140 optical ($UBVRI$) CCD images spanning 35 years from astronomical data archives. We have successfully identified previously kno
Externí odkaz:
http://arxiv.org/abs/2405.13464
Autor:
Madore, Barry F., Freedman, Wendy L.
We review the theoretical underpinnings, evolutionary status, calibrations and current applications of three bright Population II extragalactic distance indicators: Tip of the Red Giant Branch (TRGB) stars, RR Lyrae variables and J-Branch Asymptotic
Externí odkaz:
http://arxiv.org/abs/2305.19437
Autor:
Bhardwaj, Anupam, Marconi, Marcella, Rejkuba, Marina, de Grijs, Richard, Singh, Harinder P., Braga, Vittorio F., Kanbur, Shashi, Ngeow, Chow-Choong, Ripepi, Vincenzo, Bono, Giuseppe, De Somma, Giulia, Dall'Ora, Massimo
RR Lyrae variables are excellent population II distance indicators thanks to their well-defined period-luminosity relations (PLRs) at infrared wavelengths. We present results of near-infrared (NIR) monitoring of Galactic globular clusters to empirica
Externí odkaz:
http://arxiv.org/abs/2302.05455
Akademický článek
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Autor:
Kumar, Nitesh, Bhardwaj, Anupam, Singh, Harinder P., Das, Susmita, Marconi, Marcella, Kanbur, Shashi M., Prugniel, Philippe
We present a new technique to generate the light curves of RRab stars in different photometric bands ($I$ and $V$ bands) using Artificial Neural Networks (ANN). A pre-computed grid of models was used to train the ANN, and the architecture was tuned u
Externí odkaz:
http://arxiv.org/abs/2303.15117
Predicting Physical Parameters of Cepheid and RR Lyrae variables in an Instant with Machine Learning
We present a machine learning method to estimate the physical parameters of classical pulsating stars such as RR Lyrae and Cepheid variables based on an automated comparison of their theoretical and observed light curve parameters at multiple wavelen
Externí odkaz:
http://arxiv.org/abs/2303.13692
Autor:
Braga, V. F., Fiorentino, G., Bono, G., Stetson, P. B., Martínez-Vázquez, C. E., Kwak, S., Tantalo, M., Dall'Ora, M., Di Criscienzo, M., Fabrizio, M., Marengo, M., Marinoni, S., Marrese, P. M., Monelli, M.
We investigate the properties of the mixed-mode (RRd) RR Lyrae (RRL) variables in the Fornax dwarf spheroidal (dSph) galaxy by using $B$- and $V$-band time series collected over twenty-four years. We compare the properties of the RRds in Fornax with
Externí odkaz:
http://arxiv.org/abs/2209.14004
Autor:
Takeda, Yoichi
Photospheric abundances of C, N, O, and Na were determined by applying the synthetic spectrum-fitting technique to 34 snap-shot high-dispersion spectra of 22 RR Lyr stars covering a metallicity range of -1.8 <[Fe/H] < 0.0, with an aim of investigatin
Externí odkaz:
http://arxiv.org/abs/2205.15816
Autor:
Duan, Xiao-Wei, Chen, Xiaodian, Sun, Weijia, Deng, Licai, Zhang, Huawei, Yang, Fan, Liu, Chao
Publikováno v:
ApJ 918 3 (2021)
Hydrogen emissions of RR Lyrae variables are the imprints of shock waves traveling through their atmospheres. We develop a pattern recognition algorithm, which is then applied to single-epoch spectra of SDSS and LAMOST. These two spectroscopic survey
Externí odkaz:
http://arxiv.org/abs/2107.13573