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Date + Time ................................
02/7/2015 - 20:03 UTC
Location ....................................
"Nunki Observatory" - Skiathos
Optics .........................................
Officina Stellare Advanced RILA 400 f/5.25
Tools .......................................... THE SKY
X
Camera ......................................
SBIG
STXL11002 with FW8G-STXL (Astrodon
filters)
Exposure Time.........................
Lum: 1.7 Hours
Mount ....................................... Paramount
ME
Guiding .................................... Self guided
Processing Details .................. Maxim , AIP4WIN
More Details ...........................
Environment Temperature : 22 oC Camera Temperature -30 οC
Sky temperature ..................... -2. οC
Notes ........................................ Weather:
Clear Transparence:
Medium
Humidity : 70-75 %
Moon Illumination ............... 100%
Target details .........................
An SX Phoenicis variable is a type of variable star. These
stars exhibit a short period pulsation behavior that varies on time
scales of 0.03–0.08 days (0.7–1.9 hours). They have spectral
classifications in the range A2-F5 and vary in magnitude by up to
0.7.Compared to the Sun, these stars have a lower metallicity, which
means they have a reduced abundance of elements other than hydrogen
and helium. They also have relatively high space velocity and low
luminosities for stars of their stellar classification. These
properties distinguish the SX Phoenicis variables from their
cousins, the Delta Scuti variables. The latter have longer
periods, strong metallicity and large amplitudes.
SX Phoenicis variables are found primarily in globular clusters and
galactic halos. The variability cycle has a periodicity-luminosity
relation.All known SX Phoenicis variables in globular clusters are
blue straggler stars.These are stars that appear more blue (having a
higher temperature) than the main sequence stars in the same cluster
that have similar luminosities. |
