SSSPM J1549-3544 [SEP] constellation
SSSPM J1549-3544
SSSPM J1549-3544 is a star in the constellation Lupus with high proper motion. It was initially found to have high proper motion in a 2003 survey of images taken by the optical SuperCOSMOS Sky Surveys and by the near-infrared sky surveys 2MASS and DENIS. It was then thought to be a cool white dwarf close to the Sun. However, more detailed spectroscopic observations in 2005 appear to show that it is not a white dwarf, but a high-velocity halo metal-poor subdwarf.
, being more luminous than white dwarfs, are a significant component in the hot star population of old stellar systems, such as globular clusters and elliptical galaxies.
Examples of subdwarfs.
- Kapteyn's Star
- Groombridge 1830
- Mu Cassiopeiae
- 2MASS J05325346+8246465, a possible halo brown dwarf and the first substellar subdwarf.
- SSSPM J1549-3544