MMT HYPERVELOCITY STAR SURVEY
نویسندگان
چکیده
منابع مشابه
Mmt Hypervelocity Star Survey
We describe a new survey for unbound hypervelocity stars (HVSs), stars traveling with such extreme velocities that dynamical ejection from a massive black hole (MBH) is their most likely origin. We investigate the possible contribution of unbound runaway stars, and show that the physical properties of binaries constrain low mass runaways to bound velocities. We measure radial velocities for HVS...
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We report the first hypervelocity star (HVS) discovered from the LAMOST spectroscopic survey. It is a B-type star with a heliocentric radial velocity about 620 km s, which projects to a Galactocentric radial velocity component of ∼477 km s. With a heliocentric distance of ∼13 kpc and an apparent magnitude of ∼13 mag, it is the nearest bright HVS currently known. With a mass of ∼9M⊙, it is one o...
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We discuss our targeted search for hypervelocity stars (HVSs), stars traveling with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Our survey, now half complete, has successfully identified a total of four probable HVSs plus a number of other unusual objects. Here we report the most recently discovered two HVSs: SDSS J110557.45+093439.5 a...
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We study the acceleration of the star HE 0437–5439 to hypervelocity and discuss its possible origin in the Large Magellanic Cloud (LMC). The star has a radial velocity of 723 km s and is located at a distance of 61 kpc from the Sun. With a mass of about 8M⊙, the travel time from the Galactic centre is of about 100Myr, much longer than its main sequence lifetime. Given the relatively small dista...
متن کاملHypervelocity Planets and Transits Around Hypervelocity Stars
Introduction: At the center of the Milky Way galaxy lies a black hole with mass ∼ 4× 106 that of the Sun. When a binary star system (two stars gravitationally bound to one another) approaches this massive black hole (MBH), the system can be tidally disrupted. This disruption can lead to the ejection of one star from the Milky Way at velocities of ∼ 1.5 million miles per hour. This is known as a...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1088/0004-637x/690/2/1639