LZ Her

 

   

IMAGE DETAILS

Object ............................................ LZ Her
Constellation ..............................  Hercules
V. Magnitude + Variability......... 14.10 - 14.60 / SXPHE

RA / DEC ..................................... 17h:49m.29sec / +29 19m.16sec
Period ...........................................  0.198959  days

Comparison star .........................  GSC 2089:874
Check star .................................... G
SC  2089:1154

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 0.030.08 days (0.71.9 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.

 

Nikos Paschalis