| G 65.3+5.7 Many diffuse and filamentary structures compose this remnant ; SH2-91, SH2-94 and SH2-96 are some of the brightest parts. The whole structure covers a field of more than 4°, which is very similar to the size of the popular Cygnus Veils. However G65.3+5.7 is much fainter, to a larger distance of about 2500 LYs as compared with 1500 LYs for the Veils, and much older (~ 30000 years vs 7500 years). G65.3+5.7 shows a significant signal both in Halpha and OIII ; stronger in Halpha especially in the area of SH2-91 & SH2-94, but the OIII signal allows to better estimate the whole structure and limits of the SNR, while the Halpha signal tends to merge with the surrounding galactic nebulosities. |
G 65.3+5.7 "les petites dentelles du Cygne",
est un faible rémanent de supernova (RSN) localisé dans la constellation du Cygne, au nord d'Albireo. G65.3+5.7 est composé de nombreuses structures filamentaires, dont les éléments catalogués SH2-91, SH2-94 et SH2-96. La structure de ce rémanent couvre une surface de plus de 3°, ce qui lui confère une taille proche de celle des Dentelles du Cygne. Sa structure est d'ailleurs très similaire, mais ce RSN est plus ancien (~30000 ans estimé contre 7500 ans pour les Dentelles) et plus éloigné (2500 A.L.). G 65.3+5.7 émet dans les raies Ha et OIII (signal SII à vérifier), plus intensément en Ha en particulier dans les zones SH2-91 et SH2-94, mais le signal OIII permet mieux de cerner les limites de ce RSN, alors que le signal Ha a tendance à se perdre dans les nébulosités galactiques environnantes. |
 SH2-94+96 composite "HoO+RGB" color image Red = H-alpha (5h00 / 20min subs) + R (1h30 / 5min subs) Green = OIII (4h00 / 20min subs) + G Blue = OIII + B (3x90min for RGB / 5min subs bin1) FSQ106ED f/3.6 CCD camera Atik 4000 (Kodak KAI-4021M) @-20°C Astrodon Ha and OIII 5nm bandwidth filters and RGB |
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 SH2-91 "HoO" composite color image FSQ106ED f/3.6 CCD camera Atik 4000 (Kodak KAI-4021M) @-20°C Astrodon Ha and OIII 6nm bandwidth filters 15 min subs - total 4h15 (Halpha) + 1h30 (OIII). |
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North-East area (no name), OIII.
FSQ106ED f/3.6 CCD camera Atik 4000 (Kodak KAI-4021M) @-20°C Astrodon Ha & OIII 5nm bandwidth filters. OIII image  Comparison of the OIII response for the three main areas of the SNR.  DSS red/blue composite image |
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 Wide field (4.35°) ; OIII signal
Canon 200mm f/2.8L CCD camera Atik 4000 (Kodak KAI-4021M) @-20°C Astrodon OIII 5nm bandwidth filter. 23x10min = 2h50 exposure  Same as above - inverted
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 OIII response of the SNR [F. Mavromatakis et al.] 2&3: SH2-91 4: SH2-94 5: SH2-96  OIII response of the SNR [F. Mavromatakis] |
Other images: http://astronomy-mall.com/Adventures.In.Deep.Space/sh2091.htm http://deanrowe.net/astro/?image=images/sh2_91 http://www.skymonsters.net/immagine.php?img=G65.2_5.7.jpg http://www.pbase.com/m_figenwald/image/145011221 http://www.astrofoto.ca/stuartheggie/ccd_photos/Sh2-91_AP155_U16M.html http://www.capella-observatory.com/ImageHTMLs/SNRemnants/SH2-91.htm http://www.astrosurf.com/lorastro/Image/Sh2-91.jpg http://www.astro.uni-bonn.de/~mischa/gallery_ccd/sh2-91.html http://www.astrosurf.com/petitdemange/images/sh2-91-13x40m-1280px.png Papers: http://users.physics.uoc.gr/~fotis/snr/g65/g653.html http://www.aanda.org/ http://arxiv.org/pdf/astro-ph/0405350.pdf http://adsabs.harvard.edu/abs/1977ApJ...215L..69G http://www.reinervogel.net/index_e.html |
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