From: Subject: Mystery of Quintuplet stars in Milky Way solved Date: Thu, 17 Aug 2006 14:20:07 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0047_01C6C208.3D77DBF0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0047_01C6C208.3D77DBF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.eurekalert.org/pub_releases/2006-08/riot-moq081606.php Mystery of Quintuplet stars in Milky Way = solved

Public = release date:=20 17-Aug-2006
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Contact: Susan Gawlowicz
smguns@rit.edu
585-475-5061
Rochester Institute of=20 Technology

Mystery of Quintuplet stars in Milky Way solved

For the first time, scientists have identified the cluster of = Quintuplet=20 stars in the Milky Way's galactic center, next to the super massive = black hole,=20 as massive binary stars nearing the end of their life cycle, solving a = mystery=20 that had dogged astronomers for more than 15 years.

The nature of the stars was not entirely clear until now. In a paper=20 published in the Aug. 18 issue of Science, co-authors Peter Tuthill of = the=20 University of Sydney and Donald Figer of Rochester Institute of = Technology show=20 that the Quintuplet cluster consists of young massive binary stars that = produce=20 large amounts of dust. Their data reveal that five bright red stars are = nearing=20 the end of their "short" lives of approximately 5 million years. These = quickly=20 evolving stars burn fast and bright, but die younger than fainter stars, = which=20 live for billions of years. The study captures the Quintuplet stars just = before=20 disintegrating in supernovae explosions.

Using advanced imaging techniques on the world's biggest telescope at = the=20 W.M. Keck Observatory in Hawaii, the scientists captured the stars at = the=20 highest attainable resolution for the instrument, far exceeding the = capability=20 of the Hubble Space Telescope, which imaged the cluster a decade ago. = The=20 extra-resolution gives scientists a new glimpse of the dust plumes = surrounding=20 the stars and the swirling spirals Tuthill likened to pinwheels when he=20 identified the first one in 1999 elsewhere in the galaxy.

"Only a few pinwheels are known in the galaxy," Figer says. "The = point is,=20 we've found five all next to each other in the same cluster. No one has = seen=20 anything like this before."

According to Figer, the swirling dust in pinwheel stars is key to the = presence of the most evolved massive stars and points to the presence of = pairs=20 of stars. The geometry of the plume allows scientists to measure the = properties=20 of the binary stars, including the orbital period and distance.

"The only way that pinwheels can form is if they have two stars, = swirling=20 around each other. The stars are so close that their winds collide, = forming dust=20 in a spiral shape, just like water sprayed from a garden hose of a = twirling=20 sprinkler," Figer says. "A single star wouldn't be able to produce the = dust and=20 wouldn't have the spiral outflow."

An earlier study by Figer in 1996 claimed the Quintuplet cluster = consists of=20 evolved massive stars that produce dust. Figer's research could not be = confirmed=20 until now with the use of the Keck telescope.

"If you want to understand star formation, you have to understand if = they are=20 forming alone or if they have partners," Figer says. "The answer gives = us a clue=20 as to whether stars form alone or with companions."

###

EMBARGOED: NOT FOR RELEASE UNITL 2 P.M. U.S. EDT THURSDAY, AUG.=20 17

Contact: Donald Figer, (585) 747-6020. Figer is a professor at = RIT's=20 Chester F. Carlson Center for Imaging Science and director of the = Rochester=20 Imaging Detector Laboratory.

Susan Gawlowicz, RIT's University News Services, (585) 475-5061 or smguns@rit.edu

Other scientists involved with the study include John Monnier of = University=20 of Michigan, Angelle Tanner of the Jet Propulsion Laboratory, Andrea = Ghez of=20 University of California and William Danchi of NASA Goddard Space = Center.

Image available at: htt= p://www.thetigerbeat.com/filestore/quintuplet_cluster.tif=20 (5.8 Mb)

Image Caption: A Yin and Yang in the Galactic Center. High-resolution = infrared images of the dusty pinwheel nebulae are shown inset overlaid = on a=20 Hubble Space Telescope image of the Quintuplet cluster. Each of the five = bright=20 red stars is now thought to be a pinwheel nebula. Image Credit: Peter = Tuthill=20 (Sydney U.), Keck Observatory, Donald Figer (RIT).

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