Forum der Vereinigung der Sternfreunde

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 Post subject: Albireo_B
PostPosted: 15. August 2016, 12:15:18 PM 
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Meister

Joined: 04. November 2008, 21:48:07 PM
Posts: 633
Location: Schulberg
Hallo,

hat hier jemand Erfahrung mit diesem Objekt?

Gruß
Siegfried


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Albireo_B_20160807_Hb.png
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 Post subject: Re: Albireo_B
PostPosted: 16. August 2016, 01:19:25 AM 
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Dauernutzer
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Joined: 20. December 2012, 00:14:47 AM
Posts: 132
Location: Berlin
Hallo Siegfried,

bis jetzt noch nicht. Die Wetterprognose für diese Woche sieht aber ganz gut aus - werde vielleicht mal draufhalten.
Die Spektren sind von der Komponente B, dem blauen Begleiter - richtig?

Viele Grüße

Ulrich


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 Post subject: Re: Albireo_B
PostPosted: 16. August 2016, 12:21:45 PM 
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Meister

Joined: 04. November 2008, 21:48:07 PM
Posts: 633
Location: Schulberg
Hallo Ulrich,

ja, das ist der Blaue, ein B8, der Rote ist ein K3. Arbeite an einem Cygnus-Scan, dh. nehme alle helleren Sterne,
die 2 WR/WN und P-Cyg auf.

LG
Siegfried


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 Post subject: Re: Albireo_B
PostPosted: 16. August 2016, 19:11:15 PM 
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Meister
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Joined: 25. October 2006, 23:43:13 PM
Posts: 740
Location: Cumbria England
Hello Siegfried,

I think the activity is quite stable. There are some results on ARAS BeAm back to 2001
http://arasbeam.free.fr/spip.php?page=b ... 20&lang=en

Cheers
Robin


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 Post subject: Re: Albireo_B
PostPosted: 16. August 2016, 19:43:23 PM 
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Meister

Joined: 04. November 2008, 21:48:07 PM
Posts: 633
Location: Schulberg
Thanks Robin,

I wanted information about the properties of the star. What interests me is,
how the weak emission in H-beta is formed.

Cheers
Siegfried


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 Post subject: Re: Albireo_B
PostPosted: 17. August 2016, 08:33:01 AM 
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Meister
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Joined: 11. December 2009, 21:26:32 PM
Posts: 1263
Location: 14478 Potsdam
Hallo Siegfried,

speziell kann ich zu diesem Stern leider nix sagen. Aber ich bin auf ein recht interessantes Paper zur Ha Linien von Be Sternen gestossen:

http://iopscience.iop.org/article/10.10 ... /1/228/pdf

LG,
Daniel

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 Post subject: Re: Albireo_B
PostPosted: 17. August 2016, 21:19:06 PM 
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Meister
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Joined: 25. October 2006, 23:43:13 PM
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Location: Cumbria England
Hello Siegfried,

The H beta emission comes from the same source as the H alpha emission (The circumstellar disk) Sometimes you can also see emission in H gamma in Be stars. The H alpha emission in Albireo B is very strong and overpowers the photospheric absorption from the B star. H beta is much weaker so just appears at the bottom of the deep photospheric H beta absorption. You can still see the two spikes on the red and blue sides though which are also seen in the H alpha emission (from the red and blue shifted edges of the disk, seen edge on). The strength of H beta, H gamma emission depends on the density of the disk. Other emission lines can also sometimes be seen in Be stars. For example He.

See also this review of Be stars on the Shelyak website.
http://www.shelyak.com/dossier.php?id_dossier=24&lang=2

Cheers
Robin


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 Post subject: Re: Albireo_B
PostPosted: 18. August 2016, 20:23:40 PM 
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Meister

Joined: 04. November 2008, 21:48:07 PM
Posts: 633
Location: Schulberg
Thanks Robin,

it's always fascinating dynamic processes to be observed in Be stars.

Cheers
Siegfried


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 Post subject: Re: Albireo_B
PostPosted: 19. August 2016, 21:11:46 PM 
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Meister

Joined: 04. November 2008, 21:48:07 PM
Posts: 633
Location: Schulberg
Hallo,

Albireo mal physikalisch betrachtet, ein B8V/K3II Paar!

LG
Siegfried


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 Post subject: Re: Albireo_B
PostPosted: 24. August 2016, 18:08:46 PM 
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Meister
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Joined: 11. November 2007, 18:11:30 PM
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Hallo,
ich habe vor ein paar Tagen ebenfalls Albireo B spektroskopiert, was garnicht so einfach war, da auf dem Bildschirm nur A zu sehen war. Erst als ich den Helligkeitsregler weiter aufgedreht habe, war er zu sehen. Ich habe den Lhires mit 1200 L/mm genommen und im Hgamma und Hdelta-Bereich nur 4 x 180 s mit dem C11 belichtet. Diese Linien sind trotz des bescheidenen S/N ganz gut zu sehen. Jedoch rechts von Hgamma sieht es etwas seltsam aus. Sind das Interferenzen oder gibt das die wirklichen Verhältnisse wieder?
Viele Grüße
Christian


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