Sentences with phrase «main sequence stars»

Most stars spend 90 % of their life as main sequence stars.

Main sequence stars in this region experience only small changes in magnitude and so this variation is difficult to detect.

These represent the final evolutionary stage of many main sequence stars.

We aim to determine the level of near - infrared exozodiacal dust emission around a sample of 42 nearby main sequence stars with spectral types ranging from A to K and to investigate its correlation with various stellar parameters and with the presence of cold dust belts.

The brighter component is an F - type main sequence star with a stellar classification of F5V [3] and an apparent magnitude of 6.33.

The majority of these systems are unresolved and analysis of the dust properties is limited by the lack of information regarding the dust location.vThe Herschel DUNES key program is observing 133 nearby, Sun - like stars (< 20 pc, FGK spectral type) in a volume... ▽ More Dusty debris discs around main sequence stars are thought to be the result of continuous collisional grinding of planetesimals in the system.

You can then discover a correlation between luminosity, mass, and temperature for main sequence stars that our physical theories must account for.

Previously, such large flares had not been observed in Sol - type main sequence stars, although they are common in a group of dim main - sequence, reddish M dwarfs known as flare stars.

Achernar is a blue - white main sequence star of spectral and luminosity type B3 Vpe (Hiltner et al, 1969), that previously had been classed as bright as a subgiant.

Our overall detection rate is 18 %, including four new detections, among which are... ▽ More The HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey searches for dust near the habitable zones (HZs) around nearby, bright main sequence stars.

This method assumes that all Zero - Age main sequence stars of a given temperature (and, hence, mass) start at the same luminosity.

Brown dwarfs are essentially substellar bodies that failed to gather enough mass during their formative period to sustain the nuclear fusion process raging at the heart of other main sequence stars.

In high mass main sequence stars, the opacity is dominated by electron scattering, which is nearly constant with increasing temperature.

Kepler - 10 is a relatively old (11.9 + / - 4.5 Gyr) but otherwise Sun - like Main Sequence star with Teff = 5627 + / - 44 K, Mstar = 0.895 + / - 0.060 Msun, and Rstar = 1.056 + / - 0.021 Rsun.

Abstract: We present the first scattered - light images of the debris disk around 49 ceti, a ~ 40 Myr A1 main sequence star at 59 pc, famous for hosting two massive dust belts as well as large quantities of atomic and molecular gas.

False positives caused by the transits of giants by main sequence stars are estimated to be negligible by Brown (see his Table 1).

Tiny it may be, but 145,000 main sequence stars fill that view, providing us with a gargantuan amount of transit data for hundreds of exoplanets.

Other «dwarf» stars that are not main sequence stars include white dwarfs and brown dwarfs.

Astronomers are able to piece together the history of our Sun by analyzing similar main sequence stars in the various stages of their evolutionary cycle, through powerful telescopes such as Hubble and Kepler.

X Persei is a double star system with a blue main sequence star (spectral type O9.5 pe) for a primary component.

Regulus A is a spectroscopic binary star composed of a blue - white main sequence star belonging to the spectral class B7 V, and a companion star which can not be resolved, but is believed to be a white dwarf.

We aren't yet in a position to say, but the question is intriguing because some models suggest that the number of brown dwarfs is comparable to the number of low - mass main sequence stars.

We aim to determine the level of near - infrared exozodiacal dust emission around a sample of 42 nearby main sequence stars with... ▽ More (Abridged) Dust is expected to be ubiquitous in extrasolar planetary systems owing to the dynamical activity of minor bodies.

Theta Volantis is a white main sequence star with the stellar classification A0V.

Images from the Hubble Space Telescope reveal a Jupiter - sized planet, perhaps with a surrounding dust disk, orbiting about 115 astronomical units from a nearby main sequence star.

A main sequence star gradually brightens as it ages, and Beta Pictoris would have to be about half a billion years old for it to have become as bright as it is.

The vast majority of stars are main sequence stars - these are star like the Sun that are burning hydrogen into helium to produce their energy.

«Although fusion is no longer taking place in the core, the rise in temperature heats up the shell of hydrogen surrounding the core until it is hot enough to start hydrogen fusion, producing more energy than when it was a main sequence star,» the Australia Telescope National Facility says on their website.

With the idea of developing strong science cases for a future visible interferometer, we organized a science group around the following topics: pre-main sequence and main sequence stars, fundamental parameters, asteroseismology and classical pulsating stars, evolved stars, massive stars, active galactic nuclei (AGNs) and imaging techniques.

A main sequence star may have a mass between a third to eight times that of the sun and eventually burn through the hydrogen in its core.

Most of the stars in the universe are main sequence stars — those converting hydrogen into helium via nuclear fusion.

All main sequence stars have a core region where energy is generated by nuclear fusion.

Main sequence stars are normal stars, but due to historical factors they are also known as dwarf stars.

Main sequence stars have been extensively studied through stellar models, allowing their formation and evolutionary history to be relatively well understood.

I will present recent results and also give an update of the HOSTS survey at the LBTI, currently the most advanced survey searching for habitabe zone dust around nearby main sequence stars.