In the news this month: the coolest brown dwarf yet
UKIRT UKIDSS near infrared image of SDSS1416+13AB (left panel) and the Spitzer+UKIDSS image at mid-infrared wavelengths (right panel) CREDIT: University of Hertfordshire
An international team, led by astronomers at the University of Hertfordshire have discovered what may be the coolest sub-stellar body ever found outside our own solar system. Using the United Kingdom Infrared Telescope (UKIRT) in Hawaii, the astronomers have discovered a type of object known as a brown dwarf, smaller than other stars but larger than gas giant planets such as Jupiter. The object, known as SDSS1416+13B, is only visible in infra-red light and is in a wide orbit around a somewhat brighter and warmer brown dwarf known as SDSS1416+13A. This discovery is "the fourth time in three years that UKIRT has made a record breaking discovery of the coolest known brown dwarf, with an estimated temperature not far above 200 degrees Celsius," said the University of Hertfordshire's Dr Philip Lucas.
The light detected from the star is rather unusual, it appears far bluer at near infra-red wavelengths than any other brown dwarf detected so far. A near infrared spectrum, taken with the Japanese Subaru Telescope in Hawaii, showed that it belongs to a class of objects known as T dwarfs, and that is has a lot of methane in its atmosphere but with peculiar features including a big gap at certain wavelengths. Using the Spitzer space telescope to measure its colour at mid-infrared wavelengths,the researchers found that it is also the reddest known brown dwarf at these wavelengths by some margin. A comparison with theoretical models of brown dwarf atmospheres results in a temperature estimate of just 500 Kelvin or 227 degrees Celsius. In comparison, our own Sun has a surface temperature of approximately 6000 Kelvin. Both stars are also lacking in heavy elements, an indication that they may be very old which fits in with the low temperature of the fainter star - fainter stars use up their fuel much slower and can last for many billions of years.
The research has been accepted for publication in the Monthly Notices of the Royal Astronomical Society.
Ben Burningham, S. K. Leggett, P. W. Lucas, D. J. Pinfield, R. L. Smart, A. C. Day-Jones, H. R. A. Jones, D. Murray, E. Nickson, M. Tamura, Z. Zhang, N. Lodieu, C. G. Tinney, & M. R. Zapatero Osorio (2010). The discovery of a very cool binary system MNRAS arXiv: 1001.4393v1
Posted by Megan on Tuesday 02nd Feb 2010 (05:02 UTC) | 3 Comments | Permalink
Comments: In the news this month: the coolest brown dwarf yet
Fourrure blanche au Royaume-Uni bottes ugg de snowboard: vous devez utiliser le nettoyant transparente. Rincez-les avec une grande quantit¡§¦ d'eau jusqu'¡§€ ce qu'il n'y pas de bulle. Lorsque vous nettoyez-les, vous devriez les frotter tendrement et enlever l'eau d'une mani¡§¡§re douce. Enfin les mettre ¡§€ la place avec une bonne ventilation ainsi. Au moment d'¡§ºtre 80% ¡§€ sec, Les Femmes de UGG Liberty vous devriez les peigne afin de fixer leur forme. Puis laissez-les s¡§¦cher naturellement.Blanc ugg australia: vous pouvez vous r¡§¦f¡§¦rer ¡§€ la pointe de un ¡§€ les nettoyer. Les plonger dans l'eau pour rincer clairement. Lorsque les bottes tourner autour de 80% de mati¡§¡§re s¡§¡§che, vous devriez fixer la forme des bottes, ou ils seront froiss¡§¦s. Dans les cas normaux, il sera OK.Blanc empeigne sup¡§¦rieure de la Bomber UGG Button Bailey de snowboard: s'il vous pla?t n'oubliez ugg pas que vous ne pouviez pas utiliser un nettoyant contenant des mati¡§¡§res color¡§¦es. Vous pouvez le brosser avec du dentifrice blanc. Le pinceau doit ¡§ºtre faite de douce fourrure. Par Kids Ugg Boots ailleurs, d'appliquer une grande quantit¡§¦ d'eau pure pour les laver jusqu'¡§€ ce qu'il n'y est pas de dentifrice ¡§€ gauche, et ensuite les mettre ¡§€ la place avec une bonne ventilation afin Les Femmes de UGG Ashur de les laisser s¡§¦cher naturellement. Le point le plus important est que le Les Femmes de UGG Broome dentifrice doit ¡§ºtre blanche.Parler technique, il n'y a pas tant de diff¡§¦rence entre ce genre de bottes.
Posted by ghfghf on Wednesday 07th Sep 2011 (15:26 UTC)
Gucci New Arrival
Gucci Totes Bags
Gucci Wallets
Gucci Hobo Bags
Gucci Accessories
Gucci Accessories
Gucci Top Handles
Gucci Shoulder Bags
Posted by donghanjin on Thursday 08th Sep 2011 (03:51 UTC)
Enter replica watches, that are imitations of the original ones. Not only are they far more affordable than the original types, but they may also be easily employed as a stylish accessory. Because they're inexpensive, a person gets to have the opportunity to buy more of these with different styles to choose from and even to start a collection of them. In addition, in today's world exactly where almost everybody is attempting to create their very own fashion statement, they come in useful especially when you need to set a new trend.
Simply because closely resemble original swiss replica watches, not an individual with a very well-defined eye can tell if it is real or a copy; thus, they create great provides to give to family members and buddies during any type of party and Christmas gatherings. There are plenty of chanel watches available to select from. And what is great regarding it is that you do not need to worry about just how costly it really is or if it's durable sufficient. They are definitely worth spending and can add shade and dynamism to an outfit of an daily individual even for an average Joe.
Without a doubt, Luxury Watches are a practical alternative to original watches. You can finally are able to afford to have a sports activities watch which goes with their own sportswear or a lavish and professional watch that can be used during conventional events.
Nonetheless, even though they are replicas, not every stores may assure you how the replica watches you are buying from them are usually as tough as the real thing. You might be fooled into purchasing these things quickly, especially if you have no idea the things you need to find out about with regards to fake watches. It is vital you are aware the serial number of the timepiece, see if the name of the original manufacturer is typed correctly, and also, if it nonetheless works and processes after a couple of weeks of usage.
Posted by replica watches on Friday 09th Sep 2011 (04:27 UTC)