Bookmark Kaumudi Online  Bookmark this site  Editor@Kaumudi  |  Marketing  Print Advt rates  |  Calendar 2018        Go!    
March 23, Friday 2018 8:29 PM       

       HEADLINES: SFI men assaults Kerala Kaumudi photographer                                              Engineering student commits suicide thinking he wouldn’t be able to write exam                                              Smoke from Thrissur-Ernakulam passenger engine: Trains may get delayed                                              CPI national leadership says no need of relationship with K M Mani                                              CNG, LNG to arrive in Thiruvananthapuram                                              Cong to move no-confidence motion against govt                                              Anna Hazare to start indefinite hunger strike Friday                                              RS polls: Voted for BJP, says BSP MLA Anil Singh                                              Enormity & urgency of ecological issues cannot be ignored: Sadguru                                              Dominance of military turns Pak into failing state: Experts                                              Trump removes McMaster as NSA                                              Dalai Lama to cut foreign travel due to age, exhaustion                                              Sparking fear of trade war, Trump imposes USD 60 bn trade tariffs on China                                              Federer unfazed about No.1 ranking quest                                              Yuki Bhambri cruises into Miami Open second round                                              UAE give Afghan, Ireland WC hopes                                              Nepali cricketer Sandeep Lamichhane receives Delhi Daredevils jersey                                              Santhosh Trophy: Kerala pips Manipur 6-0                                              Kaumudi Facebook
       SCI&TECH Next Article: Apple delays release of smart speaker - HomePod  
       Stars among the oldest in our galaxy discovered
         Posted on :18:10:11 Nov 21, 2017
       Last edited on:18:10:11 Nov 21, 2017
         Tags: Stars among the oldest in our galaxy discover

WASHINGTON DC: A team of astronomers has discovered some of the oldest stars in our Milky Way.

Just like humans, stars have a life span: birth, youth, adulthood, senior and death. The study led by scientists at Georgia State University focused on old or "senior citizen" stars, also known as cool subdwarfs, which are much older and cooler in temperature than the sun.

In this study, astronomers conducted a census of our solar neighborhood to identify how many young, adult and old stars are present. They targeted stars out to a distance of 200 light years, which is relatively nearby considering the galaxy is more than 100,000 light years across. A light year is how far light can travel in one year. This is farther than the traditional horizon for the region of space that is referred to as "the solar neighborhood," which is about 80 light years in radius.

The astronomers first observed the stars over many years with the 0.9 meter telescope at the United State's Cerro Tololo Inter-American Observatory in the foothills of the Chilean Andes. They used a technique called astrometry to measure the stars' positions and were able to determine the stars' motions across the sky, their distances and whether or not each star had a hidden companion orbiting it.

The team's work increased the known population of old stars in our solar neighborhood by 25 percent. Among the new subdwarfs, the researchers discovered two old binary stars, even though older stars are typically found to be alone, rather than in pairs.

The authors then took a careful look at one particular characteristic of known subdwarf stars - how fast they move across the sky.

"Every star moves across the sky," lead author Wei-Chun Jao. "They don't stay still. They move in three dimensions, with a few stars moving directly toward or away from us, but most moving tangentially across the sky. In my research, I've found that if a star has a tangential velocity faster than 200 kilometers per second, it has to be old. So, based on their movements in our galaxy, I can evaluate whether a star is an old subdwarf or not. In general, the older a star is, the faster it moves."

Finding old stars could also lead to the discovery of new planets, Jao noted.

"Maybe we can find some ancient civilizations around these old stars," Jao said.

"Maybe these stars have some planets around them that we don't know about."

The research appears in The Astronomical Journal.

Next Article: Apple delays release of smart speaker - HomePod
China hospital to employ AI to address doctor shortage  
A new ray of hope for breast cancer patients!  
Here is how you can travel smart using these apps!  
5 most important aspects of our lives driven by technology  
This telehealth program offers hope for diabetics  
New habitable planet found near our solar system  
Going light with the new Light Phone 2  
What will happen to this beautiful blue planet?  
Liver cancer: New method identifies splicing biomarkers  
Astronomers reveal secrets of most distant supernova ever detected  
Ensuring sexual, reproductive health for overall well-being  
WeChat gets popular in Bhutan: report  
Celebrate love this Valentine's Day with Google Pixel 2  
This drug could reverse alcohol's damaging effects on brain  
Scientists discover enormous reserves of mercury in permafrost  
Google Assistant helps you set music alarms  
What is epilepsy?  
Here're some ways to keep dementia at bay  
What are memories made of?  
Second-hand plastic toys could harm your kid  
Working before and after stroke is good for brain health  
ixigo introduces India's first augmented reality feature for Train Passengers  
Super blue moon on Jan. 31 will mark last of trilogy  
Now, a blood test that can screen eight cancer types  
Secret of longevity protein revealed!  
Can there be conspiracy behind the move to shift India-West Indies one-day cricket match from Thiruvananthapuram to Kochi?
No opinion
Home Kerala India World Business Sports Sci&Tech Education Automobile CityNews Movies Environment Letters 
© Copyright keralakaumudi Online 2011  |  Reproduction in whole or in part without written permission is prohibited.
Head Office Address: Kaumudi Buildings, Pettah P.O, Trivandrum - 695024, India.
Online queries talk to Deepu Sasidharan, + 91 98472 38959 or Email deepu[at]
Customer Service -Advertisement Disclaimer Statement   |  Copyright Policy