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Topic: Tauri

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 T Tauri Stars
T Tauri is the prototype for a class of very young stars, still in the process of gravitational contraction.
T Tauri is the prototype for a class of very young stars, still in the process of gravitational contraction; that is, they have yet to evolve to reach the main sequence.
Thus, T Tauri stars are a transitional phase between the IR sources indicating proto-stars which are still shrouded in dust, and stars newly arriving at the main sequence.
www.peripatus.gen.nz /astronomy/ttausta.html   (1866 words)

 T Tauri star
T Tauri stars are found only in nebulae or very young clusters, have low-temperature (G to M type) spectra with strong emission lines and broad absorption lines.
The weak T Tauri stars are of particular interest since they provide astronomers with a look at early stages of stellar evolution unencumbered by nebulous material.
The nearest T Tauri stars occur in the Taurus molecular cloud and the rho Ophiuchus Cloud, both about 460 light-years (140 parsecs) away.
www.daviddarling.info /encyclopedia/T/TTauri.html   (385 words)

 AAVSO: T Tauri, February 2001 Variable Star Of The Month
This spectral feature is seen in the atmospheres of the T Tauri stars, which implies, in the astronomical sense, that T Tauri stars are a young, low-mass stars that are contracting as they evolve toward the main sequence stage of stellar evolution.
He chose T Tauri to be the protoype of the class since "it is best known, is among the brightest, and represents the group with respect to both emission and absorption spectra." Up to this point, these stars had been classified as irregular variables.
While T Tauri variations may result from instabilities within and interactions with the surrouding accretion disk, FU Orionis (also known as FUors) activity results from a dramatic increase in instability and the dumping of large amounts of matter on the accompanying star (Kaler 1999).
www.aavso.org /vstar/vsots/0201.shtml   (2432 words)

 T Tauri
Not far from T Tauri, Hind found a reflection nebula, now called Hind’s Variable Nebula, illuminated at the whim of its unreliable neighbor.
Then in 1890, nearly 40 years after the discovery of the strange star, Shelburn Burnham found that T Tauri itself is nestled within a very small nebula, now known popularly as Burnham’s Nebula.
As if all this were not enough, T Tauri turns out to have a binary companion, detected by its infrared glow, 0.5" to 0.7" to the south (hence known as T Tauri S, while T Tauri becomes T Tauri N), and there is even data to such that T Tauri is a triple-star system.
www.daviddarling.info /encyclopedia/T/T_Tauri.html   (286 words)

These stars are divided into two groups: the classical T Tauri stars, that undergo a moderate to strong mass accretion process, and the weak-line T Tauri stars, for which this process is quite attenuated or has already finished.
These stars are mostly weak-lined T Tauri stars, young objects in which the accretion of matter from a circumstellar disk is already finished or very weak.
For those classical T Tauri stars for which the variability was well reproduced by hot spots, a relation was found between the amplitude of the variability and the H alpha equivalent width, in the sense that larger amplitudes corresponded to larger H alpha equivalent widths.
www.iaa.es /~matilde   (1599 words)

 Zeta Tauri   (Site not responding. Last check: 2007-10-12)
A pity too, as Zeta Tauri is among the most prominent of any stars that make constellation figures, the star representing one of the celestial Bull's outstretched horns.
Defining mid-third magnitude (3.00), Zeta Tauri is in truth a brilliant hot blue class B (B2 or B4) giant or subgiant (we adopt a B2 subgiant).
Zeta Tauri, which itself varies by a tenth of a magnitude, is accompanied by a much lower mass companion that orbits with a period of 0.36 years at a distance of only about an astronomical unit.
www.astro.uiuc.edu /~kaler/sow/zetatau.html   (469 words)

 Tauri - Wikipedia, the free encyclopedia
The Tauri were the original inhabitants of the southern coast of Crimea, inhabiting the Crimean Mountains and the narrow strip of land between the mountains and the Black Sea.
The Greeks identified the Tauric goddess with Artemis Tauropolos or with Iphigeneia, daughter of Agamemnon.
Although the Crimean coast eventually came to be dominated by Greek (and subsequently Roman) colonies, notably the one at Chersonesos, the Tauri remained a major threat to Greek power in the region.
en.wikipedia.org /wiki/Tauri   (355 words)

 A triplet of binary stars   (Site not responding. Last check: 2007-10-12)
The mechanism behind the variable non-thermal radio emission from the binary star system V471 Tauri, which comprises a white dwarf and a main sequence companion star, is being investigated by Michelle Storey and Jenny Nicholls.
Recent observations indicate that the radio emission from V471 Tauri varies as the two stars orbit each other, with a drop in intensity as the white dwarf is eclipsed by its companion.
The V471 Tauri system will eventually evolve to a state where the outermost layers of the secondary star will be dragged from it by the gravitational attraction of the white dwarf.
www.physics.usyd.edu.au /rcfta/anrep96/anrep96/node14.html   (709 words)

 Exploring News & Features - A Question of Planets
They propose that most older T Tauri stars haven't lost their disks at all: The disk material has simply changed into a form that is virtually invisible to Earth-based telescopes.
Although T Tauri stars may have strong stellar winds, scientists now consider the strongest source of hydrogen-alpha emission to be hydrogen gas spiraling in from the surrounding disk to fall onto the star.
Because the "naked" T Tauri stars do not have strong hydrogen-alpha lines and there is no visible evidence that they possess protoplanetary disks, astronomers have concluded that they must have lost the disk of dust and gas that they had when they were younger.
exploration.vanderbilt.edu /news/features/planet/news_planet_research2.htm   (1741 words)

 T Tauri Film Festival - Press
The T Tauri Film Festival, held in on the campus of the University of Arkansas Community College at Batesville in late July, is a division of Ozark Foothills FilmFest devoted to showcasing, encouraging, and facilitating the work of young filmmakers.
The T Tauri Film Festival, held in Batesville July 27-30, is a division of Ozark Foothills FilmFest devoted to showcasing, encouraging, and facilitating the work of young filmmakers.
Major support for the T Tauri Film Festival is provided by the National Endowment for the Arts, the Arkansas Department of Economic Development, First Community Bank of Batesville and Searcy, WRD Entertainment, the University of Arkansas Community College at Batesville, and Lyon College.
www.ttauri.org /press.htm   (6005 words)

 Top Story - DISK AND JET FROM YOUNG STAR DL TAURI - June 06, 2002
DL Tauri is relatively young, about 2 million years old, a small fraction of its estimated lifespan of more than ten billion years.
In the Hubble image, the disk surrounding DL Tauri is the circular reddish-orange area, and the gas jet is the fuzzy line extending toward the bottom left of the image.
If further observations reveal that the jet in DL Tauri is moving at typical speeds, astronomers estimate DL Tauri has been ejecting gas jets for at least a few centuries, based on the size of the jets in the Apache Point photo.
www.gsfc.nasa.gov /topstory/20020606dltauri.html   (1007 words)

 More Sun-like stars may have planetary systems than currently thought
Classical T Tauri stars — those less than 3 million years old — are invariably accompanied by a thick disk of dust and gas, which is often called a protoplanetary disk because it is a breeding ground for planet formation.
They propose that most older T Tauri stars haven't lost their disks at all: The disk material has simply changed into a form that is nearly invisible to Earth-based telescopes.
The dense disks of dust and gas surrounding classical T Tauri stars are easily visible because dust glows brightly in the infrared region of the spectrum.
www.eurekalert.org /pub_releases/2002-12/vu-mss120902.php   (1270 words)

 CFHT's Image of the Week
The companion, T Tauri South, was detected in the near infrared J-band for the first time by the authors.
It is a mixture of material leftover from the original cloud that gave birth to T Tauri (at large scale) and from material ejected by the stars as they formed (at small scales).
It is this "wind" from the Sun that is responsible for the Northern light for example.
www.cfht.hawaii.edu /Science/Astros/Imageofweek/ciw290500.html   (610 words)

 Astronomy - The distance to a stellar youngster - Ken Croswell
T Tauri is the prototype of the class of pre-main-sequence objects that bears its name.
T Tauri is the prototype for a class of newborn stars.
T Tauri consists of at least three stars, one that shines in visible light and two that glow at infrared wavelengths.
www.astronomy.com /asy/default.aspx?c=a&id=2765   (703 words)

 T Tauri star - Wikipedia, the free encyclopedia
Roughly half of T Tauri stars have circumstellar disks, which in this case are called protoplanetary disc because they are probably the progenitors of planetary systems like the solar system.
It is thought that the active magnetic fields and strong solar wind of Alfvén waves of T Tauri stars are one means by which angular momentum gets transferred from the star to the protoplanetary disc.
A hypothesised T Tauri stage for our Solar System would be one means by which the angular momentum of the contracting Sun was transferred to the protoplanetary disc and hence, eventually to the planets.
en.wikipedia.org /wiki/T_Tauri_star   (553 words)

 APOD: 2005 September 23 - Portrait of RY Tauri   (Site not responding. Last check: 2007-10-12)
this tantalizing portrait of RY Tauri, a small stellar nursery at the edge of the Taurus molecular cloud, a mere 450 light-years away.
Illuminating a region that spans about 2/3 of a light-year, the youthful, central star is large, cool, and known to vary in brightness.
The image data for RY Tauri is from the Gemini Observatory, on Mauna Kea, Hawaii -- based on observations proposed by the Astronomy Club of Dorval, Quebec.
antwrp.gsfc.nasa.gov /apod/ap050923.html   (175 words)

 Centauri Dreams » Blog Archive » Dust and Planet Formation in T Tauri Stars
Now a team of astronomers has observed some 500 young T Tauri stars in the star-forming regions of the Orion nebula.
T Tauri stars are ideal for this kind of work.
Figuring out the various phases of T Tauri formation and how they relate to planets is thus a substantial challenge.
www.centauri-dreams.org /?p=753   (871 words)

 Star baby: T Tauri shows that a stellar nursery can be a rough-and-tumble place to live - Out There - star formation ...
Nowadays all stars of similar age and mass are known as T Tauri stars: they're immensely important because they afford astronomers a chance to study, by inference, the early history of our own solar system and Sun, born more than four and a half billion years ago.
Among the most significant discoveries has been that T Tauri was part of a multiple birth: astronomers identified a second star in the system in 1981 and a third star in 1097.
As T Tauri consumes the matter around it, it grows in mass and in energy output, often spitting up swirling streams of energetic particles called T Tauri winds.
www.findarticles.com /p/articles/mi_m1134/is_10_112/ai_111736251   (991 words)

 T Tauri Stars
T Tauri stars are presumed to be solar-mass, pre-main-sequence stars at roughly this stage of evolution.
T Tauri stars are, if sufficiently young, in a fully convective stage of evolution.
FU Orionis and similar stars comprise a particularly violent subclass of T Tauri stars, exhibiting variable mass loss rates 100-1000 times greater than is typical.
www.peripatus.gen.nz /Astronomy/TTauSta.html   (1866 words)

The Vanderbilt astronomers have new evidence that sun-like T Tauri stars may retain their protoplanetary disks, even when they are not visible from Earth.
Classical T Tauri stars -- those less than 3 million years old -- are invariably accompanied by a thick disk of dust and gas, which is often called a protoplanetary disk because it is a breeding ground for planet formation.
The second group of T Tauri stars that are somewhat older -- between three to six billion years -- and show no evidence of disks have been labeled as "naked" or "weak line" T Tauri stars.
www.newswise.com /articles/view/?id=TTAURI.VAN   (1336 words)

 Origins: News - 2002
Classical T Tauri stars - those less than 3 million years old - are invariably accompanied by a thick disk of dust and gas, which is often called a protoplanetary disk because it is a breeding ground for planet formation.
They published a key observation supporting their hypothesis in the September 1 issue of the Astrophysical Journal Letter and the article was highlighted by the editors of Science magazine as particularly noteworthy.
The second group of T Tauri stars that are somewhat older - between three to six billion years - and show no evidence of disks have been labeled as "naked" or "weak line" T Tauri stars.
origins.jpl.nasa.gov /news/2002/121302-a.html   (1275 words)

 T Tauri Stars: Overview
T Tauri stars can change spectroscopically such that the border W(H Alpha)=10 Å is crossed over [Bertout and Bouvier 1989].
The optical excess in T Tauri stars implies that the photospheric lines in these stars are not as deep as those of a main sequence star of the same spectral type.
The observational evidence for their presence in T Tauri stars is overwhelming: forbidden lines, such as [O I] and [S II], often display a high velocity emission component at about -100 to -200 km/s [Hartigan et al.
www.astro.up.pt /users/dfmf/Thesis/Hypertext/node5.html   (1299 words)

 The Tauri Group: Snapshots of Success   (Site not responding. Last check: 2007-10-12)
Tauri specialists also provided cost estimating for advanced concepts, helping define appropriate methodologies and data inputs.
The Tauri Group developed the database in Microsoft Excel as well as collected data to fill the database through various methods including research, interviews, and workshops.
When the ATLAS project ended, The Tauri Group was contracted to continue support to NASA in managing technology investments in a changing programmatic environment.
www.taurigroup.com /snapshot_atlas.htm   (261 words)

 Christopher Johns-Krull's Home Page
It is believed that starspots trace the location of strong magnetic fields on the surface of other stars, so identifying their location on the surface of T Tauri stars provides clues to the nature of the magnetic fields believed to be responsible for controlling the winds and accretion flows around these stars.
Recently, we have Doppler imaged the Classical T Tauri star Sz 68, and have found that the starspots on its surface are concentrated near the rotation pole.
Current theories which attempt to explain the process by which disk material accretes onto Classical T Tauri stars all require the star to possess a strong, dipolar magnetic field and the Doppler image of Sz 68 suggests that this might in fact be true.
sprg.ssl.berkeley.edu /~cmj   (1489 words)

 Chandra :: Photo Album :: V471 Tauri :: 30 Jan 04   (Site not responding. Last check: 2007-10-12)
The V471 Tauri system comprises a white dwarf star (the primary) in a close orbit - one thirtieth of the distance between Mercury and the Sun - with a normal Sun-like star (the secondary).
The peak in the spectrum due to carbon ions is much smaller in the giant star than in the Sun-like star, whereas the carbon peak in V471 is intermediate between the two.
The X-ray spectrum of V471 Tauri in the middle panel shows just this effect - the carbon peak is intermediate between that of a Sun-like star and an isolated red giant star.
chandra.harvard.edu /photo/2004/v471   (494 words)

 Youngstars --- Star and Planet Formation at MPE
Therefore we have put together a sample of binary and multiple T Tauri stars in which we can study the X-ray emission of each star in ROSAT HRI pointings.The advantage of investigating bound stars is that they have the same age, distance and metallicity and we do not mix up these parameters.
We study X-ray emission properties of young late-type pre-main sequence stars (T Tauri stars) and the spatial distribution of new T Tauri stars found by ROSAT.Also, we investigate X-ray emission of brown dwarfs, the first of which were detected by ROSAT in the Cha I cloud.
Another interest is the origin of isolated T Tauri stars which are found by ROSAT all sky survey far away from molecular clouds.
youngstars.mpe.mpg.de   (1313 words)

 2MASS Atlas Image Gallery
The famous young variable stellar object T Tauri, prototype to the class of pre-main-sequence objects which bears its name.
This star is an example of a Herbig Be star, which are the massive pre-stellar equivalents of the lower-mass T Tauri stars.
Herbig Ae/Be stars are the intermediate-mass (2 to 8 solar masses) counterparts of T Tauri stars.
www.ipac.caltech.edu /2mass/gallery/images_ysos.html   (3316 words)

 eSky: 139 Tauri   (Site not responding. Last check: 2007-10-12)
At more than 2,000 light years from the Solar System, it is only faintly visible to the naked eye.
The galactic position and direction of 139 Tauri relative to Earth's Sun.
Note that, at this extreme scale, the two stars appear to be extremely close together.
www.glyphweb.com /esky/stars/139tauri.html   (79 words)

 Magnetic fields on T Tauri stars   (Site not responding. Last check: 2007-10-12)
T Tauri stars are young stars with masses of about one solar mass and ages of about one million years, and thus resemble our sun at that age.
The angular momentum problem of star formation is not only crucial for the understanding of T Tauri stars but also for the understanding of our solar system, as most of the mass of the solar system is in the sun, while most of the angular momentum is in Jupiter.
Currently, the most popular model for T Tauri stars is that a magnetic field with a strength of about 1 kG couples star and disk, such that angular momentum is transported outward, while matter is flowing inwards.
www.tls-tautenburg.de /research/mag_tts.html   (620 words)

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