· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Observing >> Variable Star Observing and Radio Astronomy Previous   Index   Next   Threaded   Pages: 1 robin_astro sage Reged: 12/18/05 WR140 approaching periastron       #2126095 - 01/17/08 07:51 AM Attachment (137 downloads) Edit   Reply   Quote Quick Reply   Here are a couple of spectra in preparation for the Periastron passage of binary WR system WR140 this time next year as part of an international pro-am project http://www.stsci.de/wr140/index_e.htm They show the doppler broadened emission lines from CIII and IV. The differences between the spectra are likely to be real as there is continual variations due to turbulence in these high velocity winds. Robin Post Extras:       RLTYS Post Laureate Reged: 12/18/04 Loc: New York (Long Island) Re: WR140 approaching periastron [Re: robin_astro]       #2128450 - 01/18/08 06:11 AM Edit   Reply   Quote Quick Reply   Robin I checked the web site but I'm still not sure what WR140 is? Clear Skies. Rich (RLTYS) Post Extras:       robin_astro sage Reged: 12/18/05 Re: WR140 approaching periastron [Re: RLTYS]       #2128713 - 01/18/08 10:36 AM Edit   Reply   Quote Quick Reply   Hi Rich, WR140 is a binary system with a Wolf Rayet star (a hot massive star near the end of its life,losing mass rapidly through powerful stellar winds and on its way to going supernova) and another hot O type star. You can see the orbit here http://www.roe.ac.uk/~pmw/Wr140orb.htm It is highly eccentric which means that interractions between the powerful stellar winds of the two stars (particularly the WR star) increase dramatically around periastron producing all sorts of changes in the spectra from radio to X rays and in IR brightness due to carbon dust which the professionals are trying to unravel. Robin Post Extras:       nytecam Postmaster Reged: 08/20/05 Loc: London UK Re: WR140 approaching periastron [Re: robin_astro]       #2130666 - 01/19/08 04:52 AM Edit   Reply   Quote Quick Reply   Nice work Robin - it's been a long time coming but shows the amateur can do spectral science Post Extras:       Bruce MacDonald Pooh-Bah Reged: 01/12/06 Loc: Devizes, Wiltshire, UK Re: WR140 approaching periastron [Re: nytecam]       #2130697 - 01/19/08 06:07 AM Edit   Reply   Quote Quick Reply   That is good work, thanks for that. Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 0 registered and 0 anonymous users are browsing this forum. Moderator:  RLTYS  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 2780 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Celestron SkyScout and Meade mySky   Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Speciality Forums* -----   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   Global Coordination   Cornerstone Projects   Special Projects   Special Task Groups   Global Activities   National and Regional Activities   IYA 2009 in Africa   IYA 2009 in the USA CN Forums Home

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