AstroSat Picture of the Month (November 2017)
NGC 1851: Two star families in one Globular Cluster​

NGC 1851 is a Globular Cluster which is almost 40000 light years away from us, in the southern constellation of Columba, near Canis Major. A Globular Cluster is a group of hundreds of thousands of stars tightly bound together by their own gravity. All the stars in these spherical clusters orbit around the centre of our galaxy together. NGC 1851, or Caldwell 73, is one such cluster, visible in a moderate telescope at a magnitude of 7.3, with a size that is a third of the full moon. It was discovered by James Dunlop from Australia in 1826.

The stars in a Globular Cluster are usually born together, and hence share similar properties. However, NGC 1851 is one of the few clusters where two distinct types of stars with different properties seem to co-exist! Many individual stars in this object have been studied before with the Hubble Space Telescope (HST), but good ultraviolet images were needed to understand this mystery better. This prompted a group of 18 astronomers, including 12 from India, to use the UVIT on board the AstroSat. They imaged this cluster in the Near and Far ultraviolet wavebands far better than earlier attempts with other telescopes.

The superior resolution of AstroSat allowed them, for the first time, to measure the ultraviolet properties of individual stars in the inner crowded region of the cluster. Using this data, they could show that NGC 1851 does indeed have two distinct families of stars within it, which still retain their separate histories. This tells us that NGC 1851 was probably formed when two smaller clusters merged together some time in the past!


pic Near-UV (left) and Far-UV (right) images of the Globular Cluster NGC 1851, taken by UVIT onboard AstroSat.
The FUV image shows only the hottest stars in the cluster. All colours are artificial.

frumentius:

There's the little matter of everyone who knows me knows I've never celebrated Christmas. So I'll take my prize in bitcoin, thank you very much .

in that case i pass

but incase u want to offload some bitcoins i am game

nemesis4u:
AstroSat Picture of the Month (November 2017)
NGC 1851: Two star families in one Globular Cluster​

NGC 1851 is a Globular Cluster which is almost 40000 light years away from us, in the southern constellation of Columba, near Canis Major. A Globular Cluster is a group of hundreds of thousands of stars tightly bound together by their own gravity. All the stars in these spherical clusters orbit around the centre of our galaxy together. NGC 1851, or Caldwell 73, is one such cluster, visible in a moderate telescope at a magnitude of 7.3, with a size that is a third of the full moon. It was discovered by James Dunlop from Australia in 1826.

The stars in a Globular Cluster are usually born together, and hence share similar properties. However, NGC 1851 is one of the few clusters where two distinct types of stars with different properties seem to co-exist! Many individual stars in this object have been studied before with the Hubble Space Telescope (HST), but good ultraviolet images were needed to understand this mystery better. This prompted a group of 18 astronomers, including 12 from India, to use the UVIT on board the AstroSat. They imaged this cluster in the Near and Far ultraviolet wavebands far better than earlier attempts with other telescopes.

The superior resolution of AstroSat allowed them, for the first time, to measure the ultraviolet properties of individual stars in the inner crowded region of the cluster. Using this data, they could show that NGC 1851 does indeed have two distinct families of stars within it, which still retain their separate histories. This tells us that NGC 1851 was probably formed when two smaller clusters merged together some time in the past!


pic Near-UV (left) and Far-UV (right) images of the Globular Cluster NGC 1851, taken by UVIT onboard AstroSat.
The FUV image shows only the hottest stars in the cluster. All colours are artificial.

Speaking of which, I went to a CSIR end-of-year party at which 11 people there performed a Bollywood dance routine (don't ask ) because they've been seconded to assist on the Indian Mars Space mission.
Any info your side?

nemesis4u:


in that case i pass

but incase u want to offload some bitcoins i am game

You're worse than the Guptas!
I get the prize and have to produce the bitcoin?

frumentius:


Speaking of which, I went to a CSIR end-of-year party at which 11 people there performed a Bollywood dance routine (don't ask ) because they've been seconded to the Ind/ian Mars Space mission.
Any info your side?

no
not really informed on IS/RO activities

frumentius:


You're worse than the Guptas!
I get the prize and have to produce the bitcoin?

atleast one of us should get to celebrate Christmas with a bang

In 1973 there was an offer from Germany to jointly develop the HF 24 into the Hindustan Supersonic Strike Aircraft labelled the HSS 73 later to be known as the HF-73. This would retain the original mainframe, with radical changes to the fuselage, air intakes and the centre wing section. The cockpit was to be modified for better visibility, fuel capacity increased, and with a completely new avionics suite and powered by the Rolls Royce RB 199-34R engine would have a radius of action double that of the HF 24. “Eventually, this project had to be abandoned because, as some said, of non clearance of the RB 199 by the UK and Germany, the two partner governments involved in the engine development for the Tornado MRCA programme. Thus all efforts in developing an Indian combat aircraft had come to naught.”

reports r work on modifying 40 SU30MKI to carry brahmos has commenced

soviet era foxtrot submarines of IN

long retired

just some info on the rafale deal

gives a idea of the financial side of the deal negotiated for.

there is comparison between the 2012 deal proposal which was cancelled and the 2016 deal

IFV modified from type-59 tank chassis

and type-59 tank

12 AAMs on su30mki

Do 228 maritime surveillance aircraft radar console

akash sam console

NAVIC - Indian GPS

nemesis4u:
Kamov Ka-31 Helicopter IN Airborne Surveillance Platform

also used to locate targets for brahmos

AESA??

towards hypersonic flight and reusable launch vehicle

lionel4power:

AESA??

no

E-801M OKO planar array radar

Astronomy in Ancient India

Nemesis4u does having a 6 man passenger IFV negate the doctrine of 8 man section?

nemesis4u:


never doubt me even in ur dreams

there laugh again

https://www.dawn.com/news/1372695

https://timesofislamabad.com/cpec-china-to-get-91-of-the-gwadar-port-income-for-next-40-years/2017/11/25/

dont forget to read the comments section of dawn link, 1st link i posted

u will die laughing , as i am doing now

best comment "how 91% ?? Its >100%...Remember you need to pay them back a loan with 17% Interest..so your income is actually negative."

there laugh again

on a serious note i hope african countries take note of this , plus recently sri lanka handed over their brand new sea port to china for 99 years due to their inability to pay back loans.

very stupid comment,as they only calcalulate the cost and income of a singe port, but not calculate the impact of that port , the overall change to the local economic growth and development.
China pay most of the investment of the China-Pakistan Econo­mic Corridor (CPEC) .and this will change the geopolicial map of this region as many chinese import and export commodity will no longer through the Malacca Strait。

it's the same thing Greece sell Piraeus port and gain economic development and boosts employment.
http://www.bbc.com/news/world-asia-china-27960661
https://thediplomat.com/2016/04/how-a-greek-port-became-a-chinese-dragon-head/

Then why do you think
Greece and Serbia invited China to make Balkan canal

of course the old EU will not be happy ,the project is suspended


now the Hungary-Serbia railway 
https://euobserver.com/eu-china/140068

Odunayaw:
Nemesis4u does having a 6 man passenger IFV negate the doctrine of 8 man section?

to tell the truth dont have knowledge on this

just saying 6 or 8 does it matter

if its a necessity u will have to adapt

either with the increased no of IFVs or with delegation/distribution of duties to compensate for lower no of men

advantage/disadvantage is a matter of how things work out under action

chinese8107:


very stupid comment,as they only calcalulate the cost and income of a singe port, but not calculate the impact of that port , the overall change to the local economic growth and development.

everybody is free to voice his/her opinion here

as for local economic growth and development i will let time be the judge , say 3 years

so.......... lets chill

nemesis4u:


to tell the truth dont have knowledge on this

just saying 6 or 8 does it matter

if its a necessity u will have to adapt

either with the increased no of IFVs or with delegation/distribution of duties to compensate for lower no of men

advantage/disadvantage is a matter of how things work out under action

chinese8107:


very stupid comment,as they only calcalulate the cost and income of a singe port, but not calculate the impact of that port , the overall change to the local economic growth and development.
China pay most of the investment of the China-Pakistan Econo­mic Corridor (CPEC) .and this will change the geopolicial map of this region as many chinese import and export commodity will no longer through the Malacca Strait。

did u call me stupid
guilty as charged

good luck with changing geopolitical map of the region

for my part i am waiting for the expected demographic change - lots of pretty Chinese ladies

i seriously hope u guys bring change in the region similar to what ur doing in Xinjiang
amen to that

touche

chinese8107:


very stupid comment,as they only calcalulate the cost and income of a singe port, but not calculate the impact of that port , the overall change to the local economic growth and development.
China pay most of the investment of the China-Pakistan Econo­mic Corridor (CPEC) .and this will change the geopolicial map of this region as many chinese import and export commodity will no longer through the Malacca Strait。

it's the same thing Greece sell Piraeus port and gain economic development and boosts employment.
http://www.bbc.com/news/world-asia-china-27960661
https://thediplomat.com/2016/04/how-a-greek-port-became-a-chinese-dragon-head/

Then why do you think
Greece and Serbia invited China to make Balkan canal

same as sri lanka and Tajikistan ?

others will/might join soon

as i said time will be the judge

no point in bashing our heads here

Odun, can you tag that paki**** to this thread now

tdayof:
Odun, can you tag that paki**** to this thread now

any chance it is a lady

tdayof:
Odun, can you tag that paki**** to this thread now

you want us to start sweeping broken bottles

Odunayaw:
you want us to start sweeping broken bottles

When everything is getting too bad then we will have to call in SARS.

nemesis4u:


any chance it is a lady

Ladies hardly visit this kind of thread. In my class, we have just 6 girls and over 60 guys.

tdayof:

Ladies hardly visit this kind of thread. In my class, we have just 6 girls and over 60 guys.

too much competition

but i have a solution

go for the female lecturers