Like many carbon stars
, La Superba is variable, ranging from 4.8 to 6.4 with a period of about 157 days.
The 59 talks and 55 poster papers explore such topics as mass loss and variability in evolved stars, imaging radio photospheres with the Jansky Very Large Array, thermohaline mixing and isotope ratios in AGB stars, photometric properties of carbon stars
in the Small Magellanic Clouds, and spectroscopy surface brightness fluctuations: amplifying bright stars in unresolved stellar populations.
Using results from the early infrared satellites, Tom found that certain carbon stars
invisible at ordinary wavelengths and having anomalous quantities of silicon-rich dust emitting at 9.7[micro]m (expected from oxygen-rich rather than carbon-rich giants) have relatively high abundances of the heavier carbon isotope [sup.13]CO.
He recognised that the reddest stars are carbon stars
, and from tabulated colour indices selected WZ Cas and its visual companion as having the greatest contrast of any pair, at least as far as magnitude 8.5.
Stars like IRC+10216 are known as carbon stars
and are thought not to make much water.
The stellar ejecta of these extreme carbon stars
throws carbon into the interstellar medium where it can feed the creation of carbon-rich molecular clouds.
The reddest stars in the sky are of course the carbon stars
, whose light is intrinsically reddened by chemical processes within their atmospheres, giving them highly positive B-V colour index values.
Don't miss the beautiful carbon red star TW Horologii, normally magnitude 5.7, which displays slight variations of 0.6 magnitude--one of the sky's brightest carbon stars
. TW Horologii is situated half a degree north-north-east of NGC 1252.
According to their research, the observations of SCP 06F6 bear remarkable resemblance to a group of stars containing extremely large proportions of carbon, hence dubbed carbon stars
Skrutskie of the University of Virginia in Charlottesville and Martin Weinberg of the University of Massachusetts zeroed in on carbon stars
, the brilliant, final stage of stars that weigh one to four times as much as the sun.
Dig up these very red carbon stars
hiding high in its vicinity these winter nights.