stellar population

stellar population

[′stel·ər ‚päp·yə′lā·shən]
(astronomy)
Either of two classes of stars, termed population I and population II; population I are relatively young stars, found in the arms of spiral galaxies, especially the blue stars of high luminosity; population II stars are the much older, more evolved stars of lower metallic content; many high luminosity red giants and many variable stars are members of population II.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
According to (https://nasa.tumblr.com/post/173861083539/a-cluster-of-newborn-stars-herald-their-birth-in?linkId=67281563) NASA's post , the cluster's stellar population were born from a gas and dust cloud which has the capacity to produce a thousand stars the size of the Sun.
"The mature stellar population in MACS1149-JD1 implies that stars were forming back to even earlier times, beyond what we can currently see with our telescopes," said Laporte.
The stellar population within such fluffy extended galaxies is subject to rapid disruption due to a strong tidal force detected within the cluster.
"The stellar population within such fluffy extended galaxies is subject to rapid disruption due to a strong tidal force detected within the cluster but dark matter must be protecting the fragile star systems of these galaxies," the astronomers said.
"It's unusual to see an old stellar population formed in a burst in a disk galaxy," says astronomer John Kormendy of the University of Texas at Austin.
The synthesis models began calculating the luminosity (in a broad band filter or as a SED, [F.sub.[lambda]]([lambda]) or by using the spectral absorption indices) for a generation of stars created simultaneously, (therefore, with a same age, r, and with a same metallicity, Z), that is, the so-called single stellar population (SSP).
We propose that interactions with previously stripped material may be accelerating the transition from actively star forming to passively evolving systems dominated by an old stellar population.
The factors that contribute to this mediocre ranking are relatively high levels of overall health spending, less than stellar population health outcomes, and relatively poor access to care among those lacking health insurance.
M dwarfs like L 98-59 account for three-quarters of our Milky Way galaxy's stellar population. But they are no larger than about half the Sun's mass and are much cooler, with surface temperatures less than 70% of the Sun's.
It has a stellar population of about 500,000, and among these are massive stars 100 times heftier than our Sun. 
Today, with a stellar population in the many hundreds of thousands, an estimated 3,000 stars of at least 3 solar masses, and perhaps 20,000 solar masses concentrated in its core, the R136 cluster is the densest concentration of stars in the Local Group.