An expanding bubble of gas from the binary system XZ Tauri, 1995-2002, at 675nm wavelength (i.e., red light). These are raw frames screenshotted from the Hubble Legacy Archive viewer; the linked Wikipedia article shows part of the sequence after a lot of processing (using point-spread functions and so forth – the stars are much smaller than the big white circle in the gif that I’ve shown). Probably worth a look.
Frames: 5 Jan 1995 (Proposal ID 5768), 25 March 1998 (Proposal ID 6855), 1 December 1998 (Proposal ID 6754), 3 February 1999 (Proposal ID 8289), 6 February 2000 (Proposal ID 8289), 10 February 2001 (Proposal ID 8771), 12 February 2002 (Proposal ID 9236).
The NASA/ESA Hubble Space Telescope has snapped a striking view of a multiple star system called XZ Tauri, its neighbour HL Tauri, and several nearby young stellar objects. XZ Tauri is blowing a hot bubble of gas into the surrounding space, which is filled with bright and beautiful clumps that are emitting strong winds and jets. These objects illuminate the region, creating a truly dramatic scene.
This dark and ominous landscape is located some 450 light-years away in the constellation of Taurus (The Bull). It lies in the north-eastern part of a large, dark cloud known as LDN 1551.
Just to the left of centre in this image, embedded within a rust-coloured cloud, lies XZ Tauri. While it appears to be a single star, this bright spot actually consists of several stars. It has long been known to be a binary, but one of these two stars is thought also to be a binary, making a total of three stars within a single system.
This is not the first time that Hubble has observed XZ Tauri — between the years of 1995 and 2000, a hot bubble of gas was spotted expanding outwards from the system. This bubble can be seen as the small orange lobe very close to the top left of XZ Tauri. This gas is speeding out from the star system, leaving a trail spanning tens of billions of kilometres. As the bubble travels it hits slower moving material, triggering pulses of light and rippling shockwaves.
Above and to the right of XZ Tauri, an equally epic scene is unfolding. Wisps of deep red seem to be streaking away from the blue-tinged clumps on the right. This bright blue patch contains a star known as HL Tauri, which is associated with Herbig-Haro object HH 150. Herbig-Haro objects are streaks of hot gas blasted into space by newborn and newly forming stars and LDN 1551 is particularly rich in these dramatic objects.
In the bottom right of this Hubble image is another Herbig-Haro object known as HH 30, associated with the variable star V1213 Tauri. The star itself is hidden within a flat, bright disc of dust that is split in half by a dark lane. This dust blocks direct light from V1213 Tauri, but the star is visible via its reflected light and the prominent, knotty jets it is blasting out into space.
Image credit: ESA/Hubble and NASA; acknowledgement: Judy Schmidt