TT Cygni
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Cygnus |
Right ascension | 19h 40m 57.01568s [1] |
Declination | +32° 37′ 05.7556″ [1] |
Spectral type | C |
TT Cygni is a carbon star. It is 561 parsecs (1,830 ly) away in Cygnus. It has an apparent magnitude of 7.44.[1] It is called a carbon star because it has a high ratio of carbon to oxygen in its surface layers. The carbon was produced by helium fusion, dredged up from inside the star. A shell of carbon monoxide, about half a light year across, was emitted 6,000 years before the star was as it appears from Earth now.
References
- 1 2 3 "TT Cygni". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 20 January 2014.
This article is issued from Wikipedia - version of the 5/20/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.