Light curve of Cepheid variable star V1

This illustration shows the rhythmic rise and fall of starlight from the Cepheid variable star V1 over a seven-month period.

Cepheid variables are pulsating stars that brighten and fade in a predictable pattern. The illustrated graph shows that V1 completes a pulsation cycle every 31.4 days. The red dots on the graph represent observations by the American Association of Variable Star Observers (AAVSO), who partnered with the Space Telescope Science Institute's Hubble Heritage Project to study the star. The four stars on the graph denote observations made by the Hubble Space Telescope's Wide Field Camera 3.

Ten amateur astronomers from around the world made 214 observations of V1 between July 2010 and December 2010, obtaining four pulsation cycles. The AAVSO study allowed the Hubble Heritage team to target Hubble observations that would capture the star at its brightest and dimmest phases.


Illustration Credit: NASA, ESA and Z. Levay (STScI). Science Credit: NASA, ESA, the Hubble Heritage Team (STScI/AURA) and the American Association of Variable Star Observers

About the Image

NASA press release
Release date:23 May 2011, 20:00
Related announcements:ann1110
Size:2606 x 2005 px

About the Object

Name:Andromeda Galaxy, Hubble's Cepheid, V1
Type:Local Universe : Star : Type : Variable
Local Universe : Galaxy : Type : Spiral
Distance:2 million light years

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2.0 MB
Screensize JPEG
316.6 KB

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