Hello, With all the messages going around regarding a fiber injection unit, let me explain what we have done and how the Shelyak Instruments Fibre Injection &...
6046
Bernard Heathcote
bd_heathcote
May 4, 2009 2:31 pm
Hi Olivier, Fascinating and impressive 'stuff', which leads me to a somewhat related question I have been meaning to ask for a while ... would it be ...
6047
Olivier Thizy
olivier.thizy
May 4, 2009 3:20 pm
Bernard, Optical laws prevent from using optical fibre on Lhires III: 50µm optical fibers at f/5 is similar to a 100µm circular slit in front of the Lhires...
6048
Robin Leadbeater
niborl2000
May 4, 2009 4:02 pm
Olivier, Can you quantify how big the difference in magnitude is for the LHIRES III and eShel at say an R of 10000 and the same S/N for your 280mm aperture? ...
6049
ernst-pollmann@...
May 4, 2009 4:21 pm
Dear colleagues! German amateurs contribute with measurements at the professional project CHARA-VEGA. Dr. Philippe Stee (Chercheur - CNRS - Directeur PNPS UMR...
6050
bmauclaire@...
May 4, 2009 7:11 pm
... Hi, ... On eshel spectro, when the star is small, it doesn't spread on all fiber's surface. Is the output star image's size equal to fifer's diameter even...
6051
Olivier Thizy
olivier.thizy
May 5, 2009 1:14 pm
Robin, I a nutshel, we found that eShel is close to a Lhires III with a 1200 lines/mm in terms of signal/noise- but of course with higher resolution and much...
6052
BM
bmauclaire@...
May 5, 2009 1:22 pm
On Tue, 05 May 2009 15:13:58 +0200 ... What about a 1800 g/mm ? Bejni ~~~~~~~~~~~~~~~~~~~~~/ Handy Book to Science \~~~~~~~~~~~~~~~~~~~~~ If it's green or...
6053
Olivier Thizy
olivier.thizy
May 5, 2009 3:09 pm
Benji, It should S/N~65 and R~10000. Otherwise, it is interesting to note that R=12000 is achieve with a Lhires III 2400gr/mm and a 40µm slit. We usually...
6054
Eric Jensen
ejensen
May 5, 2009 3:20 pm
Hi Olivier, ... This is a related but, I think, distinct question. Would it be possible to use/adapt the eShel *calibration* unit with the LHIRES III? (I'm...
6055
Robin Leadbeater
niborl2000
May 5, 2009 5:48 pm
Thanks Olivier, If I am reading the figures correctly this suggests there is very little light lost in your fibre feed compared to direct coupling using a...
6056
Olivier Thizy
olivier.thizy
May 5, 2009 8:17 pm
Robin, I would say that echelle grating are in general more efficient than traditionnal grating (because view from a better angle; this is by design). Also, we...
6057
BM
bmauclaire@...
May 5, 2009 9:20 pm
On Mon, 4 May 2009 21:10:57 +0200 bmauclaire@... wrote: Hello Oliver, hello Francois, ... Am I wrong ? Did you understand what I explained? Thanks in...
6058
Olivier Thizy
olivier.thizy
May 5, 2009 11:20 pm
Benji, The star image is not transported, only the flux. This means that you will end up with a 100µm circular image on the other side. One way to do it is to...
6059
jacques o savard
suppjos
May 6, 2009 12:00 am
I normaly only read here but ther I have some plastic fiber of 300µm and maybe whit some kind of cylindic lent we can have and image lokk like a snatural...
6060
alainspang
May 6, 2009 6:57 am
hello, this time it's seems ok ;) dec -26° ... http://tech.groups.yahoo.com/group/AVSON/message/1692 ...
6061
alainspang
May 6, 2009 7:04 am
too fast again :( :D fron UAIC Circular No. 9041 magntudes : "Apr. 21.711, 11.7; 22.720, 11.7; 23.760, 12.3; 25.683, 12.2; 27.815, 12.4" low in dec and low in...
6062
ken4optics
May 6, 2009 9:39 am
I like Jack hadn't appreciated that the star image would expand to fill the whole fibre! This means, if I read it correctly, that a 20 micron star image when...
6063
Robin Leadbeater
niborl2000
May 6, 2009 9:50 am
Thank you Olivier. This is getting very interesting :-) Do you think that it would be possible to make a telescope mounted Echelle with higher efficiency...
6064
Robin Leadbeater
niborl2000
May 6, 2009 9:58 am
Hi Jaques, Ken, It sounds like a good idea but unfortunately I dont think it will work. The focal ratio in the compressed axis after the cylindrical lens will...
6065
Wolfgang Renz
wr_astro
May 6, 2009 8:57 pm
Hi Alan Its unfortunat that the nova was reported to the public so late (two weeks after the discovery). They probably waited for a spectrum to confirm it as a...
6066
astroasp
alainspang
May 6, 2009 9:10 pm
... yes ... I will try to be more exact next time....
6067
Robin Leadbeater
niborl2000
May 7, 2009 5:27 pm
Hi everyone, I have just found out that the CAOS group are moving from their old website http://www.eso.org/~cguirao/caos/ to a new one at ...
Bonjour, Pour ceux qui font réguliérement spectres de Be, n'oubliez pas l'étoile ups Sgr, car elle est toujuours en étude par nos amis de la Republique...
6070
ken4optics
May 9, 2009 1:32 pm
One of the guys in Australia ( Al Sheeny) using the SA has imaged a spectra of what he thinks is Eta Car, but which looks completely different from ones taken...
6071
Bernard Heathcote
bd_heathcote
May 9, 2009 1:45 pm
- Hi Ken, I will have a lot at Eta once we get some clear skies ... haven't seen any for over a week. Wouldn't mind if it really rained, rather than just ...
6072
Coivel@...
May 9, 2009 5:40 pm
Bonjour à tous Je ne sais pas calibrer ce spectre du Soleil Help Merci.........Alain Bonjour à tous Je ne sais pas calibrer ce spectre du Soleil Help ...
6073
LairdeBaud@...
May 9, 2009 6:13 pm
Alain Tu peux procéder ainsi..................sous toute réserve Le sommet de ton spectre correspond à la longueur d'onde 500nm..........(T° 5770 K ) Va...
6074
Coivel@...
May 10, 2009 10:18 am
Dans un e-mail daté du 09/05/2009 20:13:31 Paris, Madrid (heure d'été), LairdeBaud@... a écrit : Question : à quelle distance se situe le SA100 du...
