A Space & astronomy forum. SpaceBanter.com

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » SpaceBanter.com forum » Others » Astro Pictures
Site Map Home Authors List Search Today's Posts Mark Forums Read Web Partners

vdB4 and NGC 225 The Sailboat Cluster



 
 
Thread Tools Display Modes
  #1  
Old February 6th 12, 10:45 PM
WA0CKY WA0CKY is offline
Senior Member
 
First recorded activity by SpaceBanter: Feb 2008
Posts: 689
Default vdB4 and NGC 225 The Sailboat Cluster

While I posted this to USENET some servers failed to pick it up as did SpaceBanter.com so am reposting it there. Sorry for the double post to some USENET servers.
Rick
__________________________________________________ ______

VdB 4 is a reflection nebula associated with the very young open star cluster NGC 225 which is often called the Sailboat Cluster. I've never seen that likeness however. The nebula may be the remains of the cloud that formed the cluster. The WEBDA puts the distance to the cluster and thus nebula (if it is related) at about 2000 light-years. But this is quite uncertain. A very interesting paper on the probable PMS stars in the cluster illustrates the problems with determining the distance to such clusters. The paper estimates the cluster is between a half million and 10 million years old based on its study of the PMS stars. No PMS doesn't mean that. It means Pre Main Sequence. Indicating these are very young stars still not settled in to getting all their energy from turning hydrogen to helium which will power the star for most of its life. The birth process isn't quite complete yet you might say. For those who want the details the paper is at:
http://www.ncra.tifr.res.in/~basi/06.../200634315.pdf

The cluster was discovered by Caroline Herschel in 1783 as #11 on her list. A few months later she found it again recording it as #15 in 1784. The Sailboat name seems to be due to Rod Pommier in an article for Astronomy magazine

VdB 4 is centered on the variable star V594 Cas. The only designation I find at Simbad for the dark nebula going out of the top of my image is [LM99] 2. To me vdB 4 looks like an alien standing with his curving arms to the left. They seem to surround a dark area. Simbad labels the brighter area just southeast of this dark region LDN 1302. I find this rather confusing. Simbad also indicates the bright nebula LBN 604 is near the top edge of my frame a bit left of center. Apparently it refers to the general glow that fills most of the frame against which the dark nebulae are seen. I certainly don't see anything but this general glow in the area.

With only 40 minutes of data the field is rather data starved. At the time I imaged this last fall (2010) I was imaging NGC 225 as one of the Herschel 400 objects, another project I have running. Consulting my visual log of the Herschel 400 I saw no mention of nebulosity nor had I heard of vdB4 until I later saw Tom Davis' wide angle view of the area showing a lot of dark and bright nebulae. By then it was too late and with nothing but clouds and poor seeing this fall I decided to go with what I had rather than try for more data. I was surprised how well vdB4 itself came through. Sometimes I get lucky.

When I went to process this I found that I'd hit a wrong key in setting up the imaging file and ended up with the red frame binned 2x2 rather than 3x3 as the green and blue images were binned. Thanks to normalization it didn't cause any problems. Just added a minor step in the processing. Because I under exposed the image I'm attaching only the 1.5" per pixel version but providing a link to the full 1" per pixel version for those want to see the noise.

14" LX200R @ f/10, L=4x10' R=2x10' GB=2x10'x3, STL-11000XM, Paramount ME

Rick
Attached Thumbnails
Click image for larger version

Name:	NGC225L4X10RGB2X10X3r.JPG
Views:	199
Size:	584.2 KB
ID:	3937  Click image for larger version

Name:	NGC225L4X10RGB2X10X3-67.jpg
Views:	353
Size:	296.9 KB
ID:	3938  
Ads
 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
looking for 1992 shuttle poster: shuttle orbiting earth next to wooden sailboat! please help if you can. rektide Space Shuttle 0 May 8th 07 02:14 AM
SA-214, the Last Cluster Booster Pat Flannery History 0 January 2nd 06 12:36 AM
SA-214, the Last Cluster Booster Pat Flannery History 0 December 31st 05 06:18 AM
NGC1647 Open cluster - Help in field testing a draft cluster magnitude chart PrisNo6 Amateur Astronomy 21 March 22nd 04 01:15 AM
How do we know that the planet in the globular cluster is OF the globular cluster? Lucius Chiaraviglio Astronomy Misc 1 August 5th 03 03:49 PM


All times are GMT +1. The time now is 02:03 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright 2004-2021 SpaceBanter.com.
The comments are property of their posters.