2014/10/30 by Costantino Sigismondi, Sigismondi, Costantino, Graziano Ucci +9
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #FOS: Physical sciences #Gamma-ray bursts and supernovae #Instrumentation and Methods for Astrophysics (astro-ph.IM) #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies #astro-ph.IM #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1410.8492
9 pages, 10 figures, submitted to JAAVSO
arxiv created 2014/10/30 · openalex publication_date 2014/10/30 · arxiv updated 2014/10/31 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The variabile star Delta Scorpii is in conjunction with the Sun at the end of November each year. We studied its magnitude by averaging the observations of 28 Nov - 1 Dec from 1996 to 2013 using the coronograph LASCO C3 on-board the SOHO Satellite and we extended of four years, i.e. 25 % of the total light curve, back to 1996, with respect to the present AAVSO dataset on this star. The 0.2 magnitude scatters of the single measurements have been studied and the sources of such disturbances are vignetting and diffraction patterns from the coronograph. The new data collected on Delta Scorpii show its minimum at mv=2.5 magnitudes for 1996 and 1997, confirming the values observed during the minimum of 2009, and the main periodicity of 11 years in the stellar variability.