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				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sun May 19, 2019 11:50 am
				by Alexandre Santerne
				Thanks Olivier for the image.
In order to evaluate how to develop the Sindex pipeline and building a kind of DB, Christian, Olivier, others, could you please send me an example of your 1D extracted and wavelength-calibrated H&K spectrum ? 
I will see how I can proceed these spectra coherently to measure the Sindex. 
Thanks. 
My email: 
Alexandre.santerne@lam.fr
Cheers,
Alex
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sun May 19, 2019 8:03 pm
				by Peter Somogyi
				Hello Alexandre,
I've sent you 2 nights (2019.05.10, 05.17 + RS CVn: also on 2019.04.19) of 4 program stars (RS CVn = HD 114519, HD115404, Ksi Boo =  	HD 131156, Sig CrB =  HD 146361).
Out of these 4 targets, RS CVn is showing an always different profile - like shooting different stars:
For the other stars, I cannot see much change (continuum slope varies somewhat - should be the choice and manual handling of reference star).
I am suprised to see the S-index being used for RS CVn - browsing through the articles for RS CVn referred to by Simbad (at least 3 I could find), the CaII + Heps emissions are measured in either EWs or fluxes (with different continuum subtraction techniques - either approximated or using a real or reconstruced templace star).
Hope we can continue the exploration and learn further!
Cheers,
Peter
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sun May 26, 2019 12:54 am
				by Dubreuil Pierre
				Bonsoir
Actuellement en mission NP sur le C2PU Calern, nous profitons aussi du T400 amateur pour utiliser UVEX(3) .
actuellement avec reseau 1200 et fente 25microns.
Ci-dessous comparaison d'un spectre T400 et une précédente acquisition  avec C8.
a suivre
Pierre et Bertrand
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sun Jun 02, 2019 3:14 pm
				by David Antao
				Bonjour à tous,
Quelques infos utiles sur la liste de cibles à observer :
		constellation		AD		DEC		Mag en B		type spectral	Vr	Info
HD 166		Pegase			00 06 36.78	 + 29 01 17.41	6.88		G8 D		-6.59	Variable of BY Dra type
HD 20630		Baleine-Taureau		03 19 21.70	 + 03 22 12.72	5.52		G5V B		18.8	Variable of BY Dra type
HD 22468		Taureau-Baleine		03 36 47.29	 + 00 35 15.94	6.63		K2:Vnk C		-15.3	Variable of RS CVn type
HD 37394		Cocher			05 41 20.34	 + 53 28 51.81	7.07		K1 D		1,32	Variable of BY Dra type
HD 41593		Orion			06 06 40.48	 + 15 32 31.57	7.57		K0V E		-9,89	Variable of BY Dra type
HD 114519	Chien de chasse		13 10 36.91	 + 35 56 05.59	8.51		F6IV + G8IV C 	-13.62	Binaire à éclipses de type Algol
HD 115404	Chevelure de berenices	13 16 51.05	 + 17 01 01.84	7.69 		K2V C		7.67	Étoile à mouvement propre élevé
HD 131156	Bouvier			14 51 23.38	 + 19 06 01.70	5.37		G7Ve+K5Ve C	1.59	Variable of BY Dra type
HD 146361	Couronne Boréale		16 14 40.86	 + 33 51 30.95	5.64		F6V+G0V C	-14.69	Variable of RS CVn type
HD 200391	Renard			21 02 25.91	 + 27 48 26.44	7.93		G0V+G5V C	-24.6	Herbig Ae/Be star
HD 210334	Lezard			22 08 40.82	 + 45 44 32.11	6.83		K0IVe+G5IV C	-33.84	Variable of RS CVn type
HD 220140	Cephée			23 19 26.64	+79 00 12.67	8.43		G9V E		-16.8	Variable of RS CVn type
HD 224085	Pegase			23 55 04.05	 + 28 38 01.25	8.20		K2+IVeFe-1 C	-20.5	Variable of RS CVn type
A bientôt
David
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Tue Sep 10, 2019 9:24 am
				by Dubreuil Pierre
				Bonjour à tous
Samedi soir, avant de lancer une série Rr_Lyr j'ai pointé le C8 sur HD 146361.
La prochaine fois je poserai plus longtemps.
			
		
				
			
 
			- region UV  H & K
 			- _hd146361_20190907_829_Pierre Dubreuil.png (7.45 KiB) Viewed 139066 times
 
		
		
		
			 
			
		
				
			
 
			- ZOOM sur la région H & K
 			- HD146361  zoom  H & K.png (7.04 KiB) Viewed 139068 times
 
		
		
		
			 
A suivre
Pierre
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Wed Sep 11, 2019 12:16 am
				by Christian Buil
				Pas mal du tout pour une étoile de magnitude V=5,5 avec un C8 ! Belle mise en évidence de l'émission. 
Christian
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Wed Sep 11, 2019 2:56 pm
				by Benjamin Mauclaire
				Salut,
A combien estimes-tu l'amplitude de l'emission ?
A combien estimes-tu l'amplitude du bruit du continuum proche ?
Benji
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Fri Sep 13, 2019 9:30 am
				by Dubreuil Pierre
				Bonjour à tous
Quelques détails dans H et K pour HD 210334  avec UVEX G1200 slit 25µ
			
		
				
			
 
			- HD 210334 région H & K
 			- HD 210334 chromospherique UV 1200.png (135.49 KiB) Viewed 138983 times
 
		
		
		
			 
			
		
				
			
 
			- zone H & K
 			- HD 210334 Zoom UV 1200.png (94.56 KiB) Viewed 138983 times
 
		
		
		
			 
Le SNR est semble-t-il OK mais je ne sais pas l'estimer !  comment faire sous ISIS ?
Pierre
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sat May 16, 2020 7:52 pm
				by Kevin Gurney
				Hi there
My interest was piqued by this project so I tried a few targets.... 
sig Crb (HD 146361), Xi Boo (HD 131156) and Chi Dra.
My first post here, and not sure how to supply images (FAQ says they have to be on a public server...? Agh - I see you can attach and place inline)
I used two calibration lines (3948.979A, and 4044.418A) in the Lhires Neon lamp which are due to traces of Argon I believe (I hadn't changed to the Argon/neon lamp). I reverse engineered them from the spectral features, and the NIST database.
If I follow this further, I'll change the lamp!
I used a C11 with Atik460EX. Location is suburban area.
			
		
				
			
 
			- Xi Boo 21 April
 			- Xi_Boo_21_April_KG.png (87.97 KiB) Viewed 136863 times
 
		
		
		
			 
			
		
				
			
 
			- Chi Dra 6 May
 			- Chi_Dra_6_May_KG.png (79.66 KiB) Viewed 136863 times
 
		
		
		
			 
			
		
				
			
 
			- sig Crb 22 April
 			- sig_crb_22_April_KG.png (67.88 KiB) Viewed 136863 times
 
		
		
		
			 
best regards
Kevin
 
			 
			
					
				Re: Chromospheric active stars: a key program for amateurs
				Posted: Sat May 16, 2020 9:16 pm
				by Christian Buil
				Hi Kevin, excellent H&K spectra. I suspect you use a Lhires III 2400 l/mm + 23 microns slit. It's OK ?
(not easy to calibrate, fine use of faint argon lines)
Christian