Sentences with phrase «luminosity on»

1979 Tobias Owen, et al., «Enhanced CO2 Greenhouse to Compensate for Reduced Solar Luminosity on Early Earth.»

Solar luminosity on the early Earth was significantly lower than today.

Get creative by mixing it with your primer, liquid foundation or your choice of moisturizer to create overall luminosity on your skin.

Not exact matches

Now, Lord, though the consecration of the world the luminosity and fragrance which suffuse the universe take on for me the lineaments of a body and a face — in you.

the universe it about 13.8 Billion yrs old based on hubble's constant and the period - luminosity law of cephied variable stars, where the bible says its only 6000 yrs.

If these wonderful families, which are such an inspiration to so many, are to reach their full potential and «to radiate the word of truth» that is our Catholic faith in all its luminosity and beauty, then we as a Church must recover the fullness of our faith's teaching on sex and loving.

Bottom Line: The Luminosity baby bouncer from Fisher - Price is ideal for parents on the go who need a lightweight bouncer.

Hubble made an educated guess based on the reasoning that the brightest stars in each galaxy all shine with the same luminosity, like light bulbs of equal wattage, so the fainter they appear, the farther away they lie.

The sun goes through an 11 - year solar cycle during which its luminosity varies according to the number of sunspots appearing on its face.

Here, by carrying out a series of simulations of stellar magnetic fields, Antoine Strugarek and colleagues show that the Sun's magnetic cycle depends on its rotation rate and luminosity.

With knowledge only of the luminosity of the star (1/600 that of the sun), the mass of the planet (1.3 times that of Earth), and the length of its orbit (11.2 days), the team was able to predict that, with a variety of possible atmospheres, it would be possible for Proxima b to harbor liquid water on its surface.

For decades astronomers have been on the hunt for so - called «solar twins» — stars with the same ages, masses, temperatures, luminosities and chemical abundances as our own sun.

(For older, even more distant galaxies, the researchers were not able to see black hole activity as clearly, but they did set upper limits on x-ray luminosity.)

«Not only does this star have the high velocity expected if it is recoiling from a supernova explosion, but the combination of its low mass, high luminosity and carbon - rich composition appear impossible to replicate in a single star — a smoking gun that shows it must have originally formed with a binary companion,» adds Ben Ritchie (Open University), a co-author on the new paper.

More recently — especially since the 2009 launch of the Kepler Space Telescope — they have relied on the slight dimming in luminosity that occurs as a planet passes in front of its star, blocking a bit of its light.

«So far we have doubled the peak and average «luminosity» - measures that are directly related to the collision rates,» said Wolfram Fischer, Associate Chair for Accelerators of Brookhaven's Collider - Accelerator Department and lead author on a paper describing the success just published in Physical Review Letters.

This image was observed with the Dark Energy Camera (DECam) gri - band filters mounted on the Blanco 4 - meter telescope on Dec. 28, 2015, around the time when the supernova reached its peak luminosity.

«For about three minutes after the BAT trigger, the superflare's X-ray brightness was greater than the combined luminosity of both stars at all wavelengths under normal conditions,» noted Goddard's Adam Kowalski, who is leading a detailed study on the event.

The star may have around 1 to 1.4 times Sol's mass (Wittenmyer et al, 2006, page 178; Valenti and Fischer, 2005; Allende Prieto et al, 1999, page 30, Table 1 for HR 799; Bonavita and Desidera, 2007, HD 16895 in Table 8; and NASA Stars and Exoplanet Database; and David F. Gray, 1992), around 1.24 times Sol's diameter based on a power - law estimate (NASA Stars and Exoplanet database; and Kenneth R. Lang, 1980); and around 2.2 times its theoretical bolometric luminosity (NASA Stars and Exoplanet database; and Kenneth R. Lang, 1980).

Star A's late spectral type and dim luminosity puts it possibly close to the lower limit of habitability for (multicellular) Earth - type plant and animal life, given the redness of its light and the increased risk of tidal locking from the closeness of the orbit necessary for liquid water on a planetary surface.

This diagram is a plot of luminosity (absolute magnitude) against the colour of the stars ranging from the high - temperature blue - white stars on the left side of the diagram to the low temperature red stars on the right side.

With the Hubble Space Telescope, astronomers were able to use the Cepheid period - luminosity relation out to distances ten times further than what could be done on the ground.

Vega may also have 2.73 + / - 0.01 times its diameter (Aufdenberg et al, 2006; and Ciardi et al, 2001) and 37 + / - 3 times (true A0V average derived by Aufdenberg et al, 2006) to 58 times (pole on) its luminosity.

Their luminosity varies on time scales of a few months to as short as a few days.

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).

It appears to be a main sequence red dwarf star of spectral and luminosity type M4.5 V. Because of its small mass and great distance from the primary (Star A), Upsilon Andromedae B appears to have a negligible effect on the radial velocity measurements used to determine that Star A has at least three large planets (Lowrance et al, 2002).

Astronomers classify stars according to their luminosity (brightness) and their surface temperature on the Hertzsprung - Russell Diagram.

At the highest zoom level, hovering your mouse over each star will give you the name, spectral type and luminosity of the star, and clicking on the star will bring up an information window that allows you to search for more information on that star.

With a visual luminosity that has reportedly varied between 0.000053 and 0.00012 of Sol's (based on a distance of 4.22 light - years) the star is as much as 19,000 times fainter than the Sun, and so if it was placed at the location of our Sun from Earth, the disk of the star would barely be visible.

On average, main sequence stars are known to follow an empirical mass - luminosity relationship.

Here the star (really the core) evolves on the horizontal branch of the Hertzsprung - Russell diagram to bluer colours and lower luminosities.

It may have around 85 percent of Sol's mass (Howard et al, 2010, for HD 97658 on Table 1, page 3), 73 percent of its diameter (Howard et al, 2010, for HD 97658 on Table 1, page 3), and 34 percent of its bolometric luminosity (Howard et al, 2010, for HD 97658 on Table 1, page 3; and the NASA Star and Exoplanet Database, derived from the exponential formula of Kenneth R. Lang, 1980).

Below about 0.5 solar masses, the luminosity of the star varies as the mass to the power of 2.3, producing a flattening of the slope on a graph of mass versus luminosity.

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).

Estimates provided by the NASA Star and Exoplanet Database — where the inner edge of BD +26 2184's habitable zone could be located at around 0.517 AUs from the star and its center around 0.764 AU, while the outer edge lies farther out at around 1.016 AUs — appear to be somewhat high based on the star's significantly sub-Solar luminosity.

Henrietta Leavitt's original paper (pdf file freely available) on the Period - Luminosity Relation was published on March 3rd 1912 in a Circular of the Harvard College Observatory.

Based on its estimated bolometric luminosity, the distance from HR 4523 A where an Earth - type planet would be «comfortable» with liquid water is centered around 0.88 AU — between the orbital distance of Venus and Earth in the Solar System, with an orbital period about 330 days, or about 90 percent of an Earth year.

The star may have around 1.25 to 1.33 times Sol's mass (Jancart et al, 2005, page 14 under HIP 109176; Nordström et al, 2004; Boden et al, 1999; NASA Stars and Exoplanet Database; and David F. Gray, 1992; and Fekel and Tomkin, 1983), around 1.4 to 1.5 times Sol's diameter based on a power - law estimate (van Belle and von Braun, 2009, page 7, Table 4; NASA Stars and Exoplanet database; and Kenneth R. Lang, 1980); and around 3.3 times its theoretical bolometric luminosity (NASA Stars and Exoplanet database; and Kenneth R. Lang, 1980).

This star is a yellowish main sequence dwarf star of spectral and luminosity type F5 - G1 Vn (Nikolic et al, 1997; based on Frans van't Veer, 1971; and Kurpinska and van't Veer, 1970; versus Hill et al, 1989, page 89).

Half the matter of the star falls on to the black hole and feeds it, and that generates a luminous flare of a billion or 10 billion solar luminosities.»

The star has a mass that is six to eight times greater than Sol's (see Petr Harmanec, 1988; and James Kaler), 14.4 (+ / - 0.4, polar) to 24.0 (+ / - 0.8, equatorial) times its diameter (ESO; and Domicano de Souza et al, 2003), and 1,070 times its visual luminosity and at least 2,900 to 5,400 times its bolometric luminosity (depending on the estimate of ultraviolet radiation).

As examples of work in this category, I would mention Judith Lean's tireless efforts on relating luminosity to sunspot number, the work of Bard and colleagues on developing isotopic solar proxies like 10Be, Shindell's work on response to solar ultraviolet variability, and the work of Foukal et al on factors governing solar irradiance variations.

Ok, I did a preliminary check on the Extrasolar Planet Encyclopedia; I converted all stellar apparent magnitudes to absolute magnitudes, those to luminosity (* solar), and calculated the inner and outer boundaries of the HZ, generously assuming an inner edge of 0.9 AU and an outer edge of 1.5 AU for our own solar system.

It probably has around 1.68 to 1.71 (+ / - 0.013) times Sol's diameter (Kervalla et al, 2003; and Gatewood and Gatewood, 1978), although the NASA Star and Exoplanet Database derived 1.80 + / -0.05 Solar - masses based on luminosity, using Kenneth R. Lang, 1980).

GJ 1214 is a cool and dim, main sequence red dwarf of spectral and luminosity type M4.5 V (NASA Star and Exoplanet Database, based on Hawley et al, 1996).

On January 13, 2003, a team of astronomers (including Ralf - Dieter Scholz, Mark McCaughrean, Nicolas Lodieu, and Bjoern Kuhlbrodt) announced the discovery of a brown dwarf companion «b» — now re-designated «ba» — to this nearby star with a total (bolometric) luminosity of just 0.002 percent that of the Sun (ESO and AIP joint press release and API press release in German — more below).

They have absolute luminosities as bright as any star in the Galaxy — on the order of one million times the luminosity of the Sun.

Based on the infrared luminosity and color of the substellar object, the mass of this brown dwarf is estimated to be between 28 and 58 Jupiter - masses based on an estimated age of the star system of between two and eight billion years (Wright et al, 2012).

Based on an interpolation table, the star's has around 2.10 of Sol's mass (NASA Stars and Exoplanet Database; and David F. Gray, 1992), 1.58 times its diameter (Akeson et al, 2009), and around 11.5 times its visual luminosity and 13.4 times its theoretical bolometric luminosity (Akeson et al, 2009; NASA Stars and Exoplanet database; and Kenneth R. Lang, 1980).

«My research,» she explains, «is focused on the study of galaxy formation and evolution — or, in other words, on how galaxies change their physical properties (color, luminosity and so on) in space and with time.»