Sentences with phrase «for main sequence stars»

Not exact matches

Estimates of the odds of a planet in general vary; some studies suggest sunlike stars have about a one in 10 chance of hosting an Earth - like planet, for example, whereas others say it's possible nearly every main - sequence star has at least one planet of some type orbiting it.

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.

Brown assumes a constant fraction of 0.49 for main - sequence stars.

This star is a main sequence, orange - red or red dwarf (K7 - M0 Vp), with peculiar metal - weak spectrum for CA I, CA II, and CR triplet (Christopher J. Corbally, S.J., 1984).

Gazing at a fixed spot in the constellation Cygnus, the Kepler telescope continually monitored 100,000 main - sequence stars for planets.

Star b is a main sequence dwarf star of spectral and luminosity type M1 - 2 Ve Duquennoy and Mayor, 1991, page 489 for Gl 107Star b is a main sequence dwarf star of spectral and luminosity type M1 - 2 Ve Duquennoy and Mayor, 1991, page 489 for Gl 107star of spectral and luminosity type M1 - 2 Ve Duquennoy and Mayor, 1991, page 489 for Gl 107 B).

This cool and dim, main sequence red dwarf (M1.5 Vne) may have about 37.5 to 48.6 percent of Sol's mass (Howard et al, 2014; RECONS; and Berger et al, 2006, Table 5, based on Delfosse et al, 2000), 34 to 39 percent of its diameter (Howard et al, 2014), and some 2.2 percent of its luminosity and 2.9 percent of its theoretical bolometric luminosity (Howard et al, 2014), correcting for infrared output (NASA Star and Exoplanet Database, derived using exponential formula from Kenneth R. Lang, 1980).

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.

Altair has the New Suspected Variable designation NSV 24910 and is unusually bright for its spectral type and so may be becoming a subgiant star that is beginning to evolve off the main sequence, as it begins to fuse the increasing amounts of helium «ash» mixed with hydrogen at its core.

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.

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.

«The TESS legacy will be a catalog of the nearest and brightest main - sequence stars hosting transiting exoplanets, which will forever be the most favorable targets for detailed investigations,» added Ricker.

Main sequence is the class name for stars that occupy a continuous distinctive band formed by plotting stellar color versus brightness for a large sample of stars.

The table below shows typical values for stars along the main sequence.

Zeta Doradus is a main sequence dwarf star of spectral and luminosity type F7 V but has been classed as white as F6 and as yellow as F9 (Lagrange et al, 2009, page 14 for HD 33262; Trilling et al, 2008, page 26; NASA Stars and Exoplanet Database; and SIMBAD).

61 Virginis is a yellow - orange main sequence dwarf of spectral and luminosity type G5 - 6 V, with about 92 to 96 percent of Sol's mass (95 percent using the isochrone mass estimate of Valenti and Fischer, 2005; and NASA Star and Exoplanet Database, based on David F. Gray, 1992), 94 to 98 percent of its diameter (96 percent for Valenti and Fischer, 2005; Johnson and Wright, 1983, page 677; and NASA Star and Exoplanet Database, derived from the exponential formula of Kenneth R. Lang, 1980), and around 78 percent of its visual luminosity and nearly 81 percent of its theoretical bolometric luminosity, with infrared radiation (Sousa et al, 2008; Valenti and Fischer, 2005; NASA Star and Exoplanet Database, based on Kenneth R. Lang, 1980).

«The TESS legacy will be a catalog of the nearest and brightest main - sequence stars hosting transiting exoplanets, which will forever be the most favorable targets for detailed investigations,» Ricker said.

In about five billion years, our own Sun will make the transition from a main - sequence yellow dwarf star, to a red giant, with dramatic implications for Earth.

Its mass and diameter are consistent with the theoretical size for a carbon - core white dwarf, one that may have evolved from a 5.05 +0.374 / -0.276 Solar - mass, B - type main - sequence star about 124 + / - 5 million years ago, after 101 to 126 million years as a giant star (Liebert et al, 2005; and Ken Croswell, 2005).

A red dwarf star, at 0.08 solar masses, can sustain fusion for 10 trillion years, demonstrating how much more efficient its Main Sequence is than the «brief» warmth of a high mass brown dwarf.

Because K2 - 39b has a short orbital period, its existence makes it seem unlikely that tidal destruction is wholly responsible for the differences in planet populations around subgiant and main - sequence stars.

For each star, we made a cross-identification to the Kepler Input Catalog58 (KIC) and restricted the analysis to stars on the main sequence with effective temperatures between 5,100 and 6,000 K (the same range as used by Shibayama et al. 16).

Bellinger and Angelou et al. (2016) recently introduced a new method based on machine learning for inferring the stellar parameters of main - sequence stars exhibiting solar - like oscillations.

Sub-dwarf classes have also been used: VI for sub-dwarfs (stars slightly less luminous than the main sequence).

Luminosity class 0 or Ia + is used for hypergiants, class I for supergiants, class II for bright giants, class III for regular giants, class IV for sub-giants, class V for main - sequence stars, class sd (or VI) for sub-dwarfs, and class D (or VII) for white dwarfs.

Nominal luminosity class VII (and sometimes higher numerals) is now rarely used for white dwarf or «hot sub-dwarf» classes, since the temperature - letters of the main sequence and giant stars no longer apply to white dwarfs.

Marginal cases are allowed; for example, a star may be either a supergiant or a bright giant, or may be in between the subgiant and main - sequence classifications.

Today for main - sequence stars, the B - class is instead defined by the intensity of the He I violet spectrum, with the maximum intensity corresponding to class B2.

After we have calculated the S indices for the 5,648 main - sequence stars based on the LAMOST spectra with signal - to - noise ratios higher than 10 in the blue part of the spectrum, including the subset of 48 superflare stars, it is possible to calculate the flare rates.

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.

The discs are found to be well aligned with the stellar equators, as in the case... ▽ More Many nearby main - sequence stars have been searched for debris using the far - infrared Herschel satellite, within the DEBRIS, DUNES and Guaranteed - Time Key Projects.

The outer disk is revealed in reprocessed archival Hubble Space Telescope NICMOS F110W images, as well as new coronagraphic H band images from the Very Large Telescope SPHERE instr... ▽ More 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.

Abstract: The HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey searches for dust near the habitable zones (HZs) around nearby, bright main sequence stars.

Abstract: We report the results of high - angular - resolution observations that search for exozodiacal light in a sample of main sequence stars and sub-giants.

Abstract: Many nearby main - sequence stars have been searched for debris using the far - infrared Herschel satellite, within the DEBRIS, DUNES and Guaranteed - Time Key Projects.

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

Global anticipation was huge for the follow - up to Star Wars, but few were expecting this darkly sophisticated transitional tale, loaded with psychological trauma, unresolved daddy issues, massive action sequences and a wholly believable Muppet main character.

The opening sequence has no dialogue, but seeing Toad and his main squeeze Toadette exploring for stars together while you learn a few basic controls immediately creates joy, which in turn is shattered as a giant evil bird called Wingo swoops down upon the pair, stealing the star and kidnapping Toadette.

For a long time, astrophysicists had known that the Sun was a main sequence star that had gradually brightened by about 10 % per billion years, so that it was considerably dimmer long ago.

For a long time, astrophysicists had known that the Sun was a main - sequence star that had gradually brightened by about 10 % per billion years, so that it was considerably dimmer long ago.