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| spectroscopically classifying supernovae https://forum.vdsastro.de/viewtopic.php?t=3644 |
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| Autor: | Robin Leadbeater [ 20. Juli 2011, 16:46:35 PM ] |
| Betreff des Beitrags: | spectroscopically classifying supernovae |
This year CBAT have stopped accepting supernova discoveries without supporting spectroscopic evidence. This is giving problems for amateur supernova hunters. I have been approached by a couple of leading UK amateurs in this field to see what amater spectroscopists could do. While it is proving possible for amateurs to take low resolution R~600 spectra of bright supernovae down to around mag 15, I am looking for more specific information about what MINIMUM resolution and SNR is needed for this task. (I have feeling based on some experience with crude slitless SNe spectra that this might be possible with R ~200 or even lower but it would be nice to have confirmation from an expert) Does anyone know or have contacts with anyone who might know? Thanks Robin |
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| Autor: | Daniel Sablowski [ 21. Juli 2011, 06:23:50 AM ] |
| Betreff des Beitrags: | spectroscopically classifying supernovae |
Hello Robin This could be of interesst: http://www.eso.org/~bleibund/ Bruno Leibundgut is the specialist at ESO. I send him your mail and ask him for help Daniel Sablowski Von: Robin Leadbeater <fg-spek-convento@vds-astro.de> An: fg-spek-convento@vds-astro.de Gesendet: Mittwoch, den 20. Juli 2011, 16:46:36 Uhr Betreff: [fg-spek] spectroscopically classifying supernovae This year CBAT have stopped accepting supernova discoveries without supporting spectroscopic evidence. This is giving problems for amateur supernova hunters. I have been approached by a couple of leading UK amateurs in this field to see what amater spectroscopists could do. While it is proving possible for amateurs to take low resolution R~600 spectra of bright supernovae down to around mag 15, I am looking for more specific information about what MINIMUM resolution and SNR is needed for this task. (I have feeling based on some experience with crude slitless SNe spectra that this might be possible with R ~200 or even lower but it would be nice to have confirmation from an expert) Does anyone know or have contacts with anyone who might know? Thanks Robin |
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| Autor: | Daniel Sablowski [ 23. Juli 2011, 08:50:27 AM ] |
| Betreff des Beitrags: | |
Hallo, ich habe eine Antwort von Herrn Leibundgurt bekommen: >Lieber Herr Sablowski, Vielen Dank fuer Ihre freundliche Anfrage. Typical emsission velocities of supernovae is around 20000 to 30000 km/s. Hence the resolution should be good enough to resolve these lines. This implies that resolutions of a few hundred are typically very good for supernova spectroscopy as they resolve the lines with a few resolution elements. In principle, resolutions down to 100 are okay, but at this point there are only few resolution elements across a single line. A resolution of 200 is probably more than adequate for early phases of supernovae. After maximum, Type Ia Supernovae start to display lines from slower material and hence a resolution of a couple hundred is probably preferable. There are many spectral series on supernovae published (and freely available) and they could probably help as guidelines. Ich hoffe, dass das ein wenig weiter hilft. Ich bin leider im Moment unterwegs und habe keine Moeglichkeit etwas Literatur zusammen zu stellen. Eine Suche nach "Supernova spectroscopy" hat folgenden Link gegeben: http://www.springerlink.com/content/v21834411107n421/ Das Buch hat den Titel "Supernovae and How To Observe Them" und hat ein Kapitel "Supernova Spectroscopy" mit einigen nuetzlichen Hinweisen. Es scheint frei zugaenglich zu sein. Mit freundlichen Gruessen, Bruno Leibundgut. |
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| Autor: | Robin Leadbeater [ 23. Juli 2011, 13:55:12 PM ] |
| Betreff des Beitrags: | spectroscopically classifying supernovae |
Thank you Daniel, That is very useful. Please pass on my thanks to Bruno Leibundgut. At 200 resolution I think we have a real chance to be able to do something useful using an efficient spectrograph and a sensible amateur aperture. Cheers Robin ----- Original Message ----- From: Daniel Sablowski (fg-spek-convento@vds-astro.de) To: fg-spek-convento@vds-astro.de (fg-spek-convento@vds-astro.de) Sent: Saturday, July 23, 2011 7:50 AM Subject: [fg-spek] Re: spectroscopically classifying supernovae Hallo, ich habe eine Antwort von Herrn Leibundgurt bekommen: Zitat: Lieber Herr Sablowski,
Vielen Dank fuer Ihre freundliche Anfrage.Typical emsission velocities of supernovae is around 20000 to 30000 km/s. Hence the resolution should be good enough to resolve these lines. This implies that resolutions of a few hundred are typically very good for supernova spectroscopy as they resolve the lines with a few resolution elements. In principle, resolutions down to 100 are okay, but at this point there are only few resolution elements across a single line. A resolution of 200 is probably more than adequate for early phases of supernovae. After maximum, Type Ia Supernovae start to display lines from slower material and hence a resolution of a couple hundred is probably preferable. There are many spectral series on supernovae published (and freely available) and they could probably help as guidelines. Ich hoffe, dass das ein wenig weiter hilft. Ich bin leider im Moment unterwegs und habe keine Moeglichkeit etwas Literatur zusammen zu stellen. Eine Suche nach "Supernova spectroscopy" hat folgenden Link gegeben: http://www.springerlink.com/content/v21834411107n421/ Das Buch hat den Titel "Supernovae and How To Observe Them" und hat ein Kapitel "Supernova Spectroscopy" mit einigen nuetzlichen Hinweisen. Es scheint frei zugaenglich zu sein. Mit freundlichen Gruessen, Bruno Leibundgut. Daniel Sablowski Das Gegenteil einer jeden Wahrheit ist falsch, das Gegenteil einer tiefen Wahrheit ist wieder eine tiefe Wahrheit. [Bohr] www.hobbysternwarteploesen.de www.sternwarte.uni-erlangen.de |
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