|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Multiple systems - How are they determined to be multiple?
On Sun, 5 Oct 2003 17:22:37 -0600, "PrisNo6" wrote:
I am working with a series of wide association stars in Harrington's _Touring the Universe with Binoculars_. Mostly these are stars he extracted from the old Aitken New General Catalogue of Double and Multiple Stars. It appears the current catalogue is Dommanget's _Catalogue of the Components of Double and Multiple Stars (2002), CDS catalogue I/274. How do professional astronomers determine whether a star is in a multiple system, let's say separated by 70-100 arcseconds? What exactly is measured to support their conclusion that a star is in a multiple system and is not just an optical binary? You can observe the separation and angle changing between the components, and determine that they have a common center of rotation. Sometimes the line-of-site speeds are measured spectroscopically, leading to the same information. _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
#2
|
|||
|
|||
Multiple systems - How are they determined to be multiple?
I am working with a series of wide association stars in Harrington's _Touring the Universe with Binoculars_. Mostly these are
stars he extracted from the old Aitken New General Catalogue of Double and Multiple Stars. It appears the current catalogue is Dommanget's _Catalogue of the Components of Double and Multiple Stars (2002), CDS catalogue I/274. How do professional astronomers determine whether a star is in a multiple system, let's say separated by 70-100 arcseconds? What exactly is measured to support their conclusion that a star is in a multiple system and is not just an optical binary? |
#3
|
|||
|
|||
Multiple systems - How are they determined to be multiple?
PrisNo6 wrote:
How do professional astronomers determine whether a star is in a multiple system, let's say separated by 70-100 arcseconds? What exactly is measured to support their conclusion that a star is in a multiple system and is not just an optical binary? Similar distance by parallax, and the same proper motion is a good clue. Then measure their relative motion to each other and look for an orbit. But I'm just guessing. Mojo -- Morris Jones * San Rafael, CA http://www.whiteoaks.com |
#4
|
|||
|
|||
Multiple systems - How are they determined to be multiple?
Thanks Chris - a good, simple, clear explanation. Kurt
"Chris L Peterson" wrote in message ... On Sun, 5 Oct 2003 17:22:37 -0600, "PrisNo6" wrote: snip How do professional astronomers determine whether a star is in a multiple system, let's say separated by 70-100 arcseconds? snip You can observe the separation and angle changing between the components, and determine that they have a common center of rotation. Sometimes the line-of- site speeds are measured spectroscopically, leading to the same information. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Planetary Systems With Habitable Earths? | Rodney Kelp | Policy | 6 | April 2nd 04 02:32 PM |
NASA Releases Near-Earth Object Search Report | Ron Baalke | Astronomy Misc | 0 | September 10th 03 04:39 PM |
Boeing-Led Team to Study Nuclear-Powered Space Systems | Ron Baalke | Technology | 2 | July 31st 03 06:49 AM |
BAE Systems Microprocessors Enroute To Mars | Ron Baalke | Technology | 0 | July 29th 03 10:40 PM |
Whats in the sky today | [email protected] | Amateur Astronomy | 3 | July 14th 03 04:24 AM |