Results 81 to 90 of about 5,541 (198)
The Astronomical Journal, 2023 SX Phoenicis (SXP) variables are short-period pulsating stars that exhibit a period–luminosity (PL) relation. We derived the gri -band PL and extinction-free period–Wesenheit (PW) relations, as well as the period-color and reddening-free period-Q-index ...
Chow-Choong Ngeow +6 more
doaj +1 more source
, 2010 We present new time-series CCD photometry, in the B and V bands, for the moderately metal-rich ([Fe/H] ~ -1.3) Galactic globular cluster (GC) M62 (NGC 6266).
Arellano Ferro +49 more
core +1 more source
Adding RR Lyrae y-Band Template Light Curves to gatspy
The Astronomical JournalWe complement the y -band template light curves for RR Lyrae to the well-established template light curves in the ugriz-band, where the latter have been adopted in the astroML/gatspy python package as one of the period-search methods for RR Lyrae.
Chow-Choong Ngeow, Chia-Yu Cheng
doaj +1 more source
Discovery of RR Lyrae in the Ultra-faint-dwarf Galaxy Virgo III
The Astronomical JournalVirgo III is a newly discovered ultra-faint-dwarf (UFD) candidate, and finding RR Lyrae associated with this galaxy is important to constrain its distance.
Chow-Choong Ngeow, Anupam Bhardwaj
doaj +1 more source
Variable stars in galactic globular clusters
Astronomy & AstrophysicsWe present a comprehensive catalog of 2824 RR Lyrae stars (RRLs) residing in 115 Galactic globular clusters (GCs). Our catalog includes 1594 fundamental-mode (RRab), 824 first-overtone (RRc), and 28 double-mode (RRd) RRLs, as well as 378 RRLs of an unknown pulsation mode. We cross-matched 481 349 RRLs reported in the third Data Release (DR3) of the ESA
Mauricio Cruz Reyes +4 more
openaire +2 more sources
Benchmarking Differential Reddening in Front of Globular Clusters
The Astronomical JournalInterstellar extinction is a major obstacle in determining accurate stellar parameters from photometry near the Galactic disk. It is especially true for globular clusters at low galactic latitudes, which suffer from significant amounts of spatially ...
Csilla Kalup, László Molnár
doaj +1 more source
The impact of large-scale, long-term optical surveys on pulsating star research
EPJ Web of Conferences, 2017 The era of large-scale photometric variability surveys began a quarter of a century ago, when three microlensing projects - EROS, MACHO, and OGLE - started their operation.
Soszyński Igor
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Period doubling and Blazhko modulation in BL Herculis hydrodynamic models
, 2012 We present the hydrodynamic BL Herculis-type models which display a long-term modulation of pulsation amplitudes and phases. The modulation is either strictly periodic or it is quasi-periodic, with the modulation period and modulation pattern varying ...
Moskalik, P., Smolec, R.
core +1 more source
The RR Lyrae variable stars in the globular cluster IC 4499
The Astronomical Journal, 1979 Periods and light curves are presented for 75 RR Lyrae variables in the globular cluster IC 4499. Of these, 52 are of the ab type with a mean period of 0.578 +- 0.009 and 23 are c type with a mean period of 0.351 +- 0.004. The cluster belongs to Oosterhoff group I (the short-period group) and has the greatest frequency of RR Lyrae variables of the ...
C. C. Clement +2 more
openaire +1 more source
The RR Lyrae variables and Horizontal Branch of NGC6656 (M22)
, 2013 The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC6656 (M22), with observations spanning a range of twenty-two years. We have also redetermined the variability types and periods for the RR Lyrae
Alvarez, Leonardo Paredes +12 more
core +1 more source