New eshel setup in Chile

[2SPOT]

We now have 2 optical and spectro setups on the same mount which consists of :

- 1 newton 305mm diameter at f/4 with an Alpy 600 spectrograph
- 1 Ritchey Chretien 305mm diameter at f/8 with an eShel fibre optic spectrograph

Here is what the setup looks like as it is installed in Chile







we can now produce low resolution R=600 spectra with the Alpy 600 and high resolution R=11000 spectra with an eShel.

Here are some results on Be stars made this morning and which have no HR spectrum in the Bess database so far:

HD 109857 (mag. V=6,49)

The full graphe of all orders.


And detail on H Alpha line



CO Cir (mag. V=5,88)



LS Mus (Mag. V=5,96)



IU Vel (Mag. V=6,05)

[Hamish Barker]

Congratulations to the whole 2spot team, and good luck for future discoveries, collaborations and publications!

[Olivier GARDE]

Thanks Hamish!!! I think we are a very good team now in the southern hemisphere between New Zealand, Australia and Chile.

A good team that allows us to cover the needs in spectroscopy in southern hemisphere in 3 different countries as soon as an event occurs

When will we have a novae in the south? I hope soon because we (all people in the southern hemisphere) are now 100% operational (Alpy, LISA, UVEX and eShel).

[2SPOT]

Some more spectra with eshel spectrograph from Chili this morning.
Next step :automatic spectrum acquisition.

Most of the spectra below do not yet have spectra in the BESS database

[James Foster]

Nice work! Inspires me to get my eShel2 up and running when all my bad weather
(snow/cold) is over with this spring.

James

[etienne bertrand]

Superbe Olivier. De beaux spectres.

Un question, si tu as besoin de refaire des darks sur avec le telescope RC de l'eshel, est ce que tu dois démonter la caméra ou ce télescope est étanche à la lumière ?

[Olivier GARDE]

@james : Thank you for your comment. The eShel II is really an excellent echelle spectrograph (135mm lens I think ? and ASI 6200 MM pro)

@ Etienne : pour le dark, on ne démonte rien (en plus c'est un peut loin pour tout démonter), on a une position sur le module de calibration qui permet de ne pas avoir de flux de lumière dans la fibre qui va sur le spectro eShel, comme celà on peut faire sans problème des dark et offset sans être sur place un peut comme sur le module de calibration de l'ALPY on si l'on bascule les 2 interrupteurs, ont peut faire des darks/offset car il y a un miroir qui s'intercale dans le chemin optique du spectrographe.

[etienne bertrand]

Ok merci pour les renseignements Olivier.
Faites de belles observations.
A+

[2SPOT]

Despite the current full moon, we are observing from Chile, which is not too much of a hindrance to making high resolution spectra with the eShel spectrograph.

Here is a night-time image of the setup being acquired, which is clearly visible because of the light of the full moon



Here is a high-resolution spectrum of a Be-type star that does not yet have a spectrum in the BESS database: HD 69404 of magnitude V=6.48, which is only visible from the southern hemisphere.



the eshel is use with the standard Canon 85mm lens avec an ATIK 460ex

and the detail on the H Alpha line of the same star




Then to show the precision of the spectral calibration whatever the wavelength, here is a graph regrouping the Hydrogen lines calibrated in velocity to show on the same graph, all the Hydrogen lines that the eShel spectrograph is able to see until the near UV

[2SPOT]

First detection of an outburst on a Be star with our new setup, the spectrum has passed in emission which means that the disk of matter in rotation around the star is reconstituted.



There are 5 years that separate these 2 spectra, the first one in 2018 was made by Terry Bohlsen. But as the southern sky is much less observed than the northern sky, it is finally easy to make discoveries like this one.

Here it is the eShel spectrograph which was used (thus in high resolution R=11000 in average orders and more in some orders).



Here is its position when pointing the target.

It is the RC12 and the eShel which were used here for this spectrum, not the Newton and the ALPY 600.

Our team can do now both HR and LR spectra from Chile